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Review

A Bibliometric Review on Safety Risk Assessment of Construction Based on CiteSpace Software and WoS Database

by
Yin Junjia
*,
Aidi Hizami Alias
,
Nuzul Azam Haron
and
Nabilah Abu Bakar
Department of Civil Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Malaysia
*
Author to whom correspondence should be addressed.
Sustainability 2023, 15(15), 11803; https://doi.org/10.3390/su151511803
Submission received: 22 June 2023 / Revised: 20 July 2023 / Accepted: 28 July 2023 / Published: 1 August 2023
(This article belongs to the Collection Advances in Construction Safety Management Practices)
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Abstract

:
As urbanization continues to grow around the world, the risks associated with construction are increasing. Scientific and practical risk assessments help reduce safety risks and achieve healthy, long-term growth, so there has been much research in this field. Through a review of the literature, this study aims to reveal the state and trends of research in the field of safety risk assessment. We searched 473 articles on construction risk assessment from the Web of Science (WoS) in the last decade, bibliometrically analyzed them, and then uncovered their significance using CiteSpace software (6.1. R6 (64-bit) Basic). The primary topics of conversation are countries, institutions, authors, and keywords, followed by references. According to the co-authorship analysis, the current research in this field is mainly from China, the USA, and Australia. Most influential authors currently have teaching or research positions at educational institutions; the most notable of which include Huazhong University of Science and Technology, Hong Kong Polytechnic University, and Tsinghua University. They form a relatively close network of institutional cooperation. Based on the results of the co-term analysis, this study found that the current research hotspots are mainly focusing on “multi-objective optimization”, “risk management”, “mechanical characterization”, “mental fatigue”, “accident prevention”, and many others. Data-driven, AI-assisted, and multi-stakeholder participation are the future trends in this field.

1. Introduction

Due to rapid economic development and urbanization, construction gained massive potential [1,2,3]. The construction project is a complex social activity that brings together various production factors, which are subject to uncertainty [4,5,6]. Usually, scholars refer to uncertainties that affect project objectives or performance as risks [7,8,9]. Project activities are also unique and dynamic, so the types of construction risks are diverse, such as political, economic, technical, environmental, and partner risks [10,11,12]. The reasons for risk are equally varied. Environmental changes, COVID-19, and mechanical failures can all lead to risks [13,14,15]. The damage can be significant if there is landslide, falling of large components, chemical blasting, or machine collapse [16,17,18].
Risk assessment is essential in managing uncertain events [19,20,21]. Risk assessment during the construction phase is necessary and challenging because it requires the most investment and human resources and has the most frequent changes in site conditions [22,23,24]. Nowadays, the safety risks associated with construction are still a pressing issue globally, especially in developing countries. As shown in Figure 1, Malaysia recorded 1680 construction safety incidents during 2015–2021 [25]. India also adopted many risk-control practices. However, the average fatal accident rate in the construction industry is still 50 times higher than in the USA [26].
Many scholars still do risk assessments using qualitative methods because they are more flexible, easier to estimate, and require less information. For instance, some researchers used fuzzy sets and object element theory to figure out how risky it is to build an urban rail [27,28]. Some researchers have also used a six-sigma evaluation to examine car park construction risk. They found that “falling objects” were the most likely type of accident, mainly caused by too much wind at the project site [29]. The Relative Importance Index (RII) was also used to look at different risks in road construction [30]. However, the qualitative evaluation results depend on the experts’ experience and skill [31]. Therefore, academics started to introduce various quantitative and dynamic methods. For example, some scholars incorporated real-time monitoring data and update risks as construction progresses to improve the dynamics of assessment models [32]. Others combined quantitative assessment and subjective randomness analysis to improve cloud models for risk assessment in tunnel construction [33]. Scholars also combined quantitative risk assessment with stochastic conditions, construction schedules, and cost estimation [34].
There are many more ways to divide assessment methods, but it is hard to say whether qualitative or quantitative methods are better for risk management. So it is essential to review the last 10 years of research on construction safety risk assessment in a systematic way to show where the research is now and what the trends are for the future. Indeed, researchers completed several literature reviews. Some scholars summarized the methodology for evaluating occupational hazards in construction projects [35]. Some scholars also conducted a content analysis of comprehensive literature reviews published during 2005–2017, investigating the application of fuzzy and mixed methods in construction risk assessment [19]. The application of system dynamics modeling to construction risk assessment was also reviewed [36]. Nevertheless, these review papers mostly used subjective evaluations and small sample sizes to examine the literature.
Bibliometric analysis is a statistical and quantitative tool that can analyze research fields to decrease subjectivity and prejudice [37,38]. Therefore, Lin et al. (2021) reviewed the application of fuzzy set theory and machine learning in deep foundation construction risk assessment using VOSviewer software [39]. Osei-Kyei et al. (2022) also reviewed construction risk management studies using VOSviewer and Gephi [40]. Chao-Mei Chen created CiteSpace with visualization features that visually present relevant information about the research area [41,42]. In addition, CiteSpace is widely used for its robust co-citation analysis, as it can follow the development process of a research area on a citation network map and detect emergent and transitional literature [43,44,45]. CiteSpace software has not yet been utilized to investigate research topics and potential construction risk assessment trends. This study, therefore, aims to address the gap.
This paper’s primary structure is as follows: Section 2 illustrates the research process, which includes selecting the software and database and searching and screening the relevant literature. Section 3 presents the outcomes of the co-author, co-term, and co-citation analyses. Section 4 discusses the future research directions in this field. Section 5 provides a summary of the work and its limitations.

2. Materials and Methods

The analysis and research of database information can be quantitatively and objectively completed using bibliometrics. Typically, it consists of co-term and co-citation analysis [46,47]. This paper is based on bibliometrics and looks at co-authorship, co-term, and co-citation analysis to help people learn more about construction risk assessment. As shown in Figure 2, the co-authorship analysis was conducted from a macro-to-micro perspective, including country analysis, institutional analysis, and author analysis. Included in the co-term analysis are keyword clustering analysis and keyword evolution analysis. Co-citation analysis consists of both co-citation author analysis and co-citation literature clustering analysis.

2.1. Software Selection

CiteSpace is a piece of information visualization and analysis software developed by Chen Chaomei that runs on the Java programming language and can be used to examine co-citation networks based on massive volumes of bibliometric data [48]. Many academics utilized CiteSpace for literature reviews of various sectors, including construction. For instance, Li et al. (2022) utilized CiteSpace to comprehensively synthesize the construction and demolition waste management literature and find prospective commercial prospects [49]. Cai et al. (2022) collected worker safety training literature and used CiteSpace to analyze research hotspots and future research directions [50]. Their work showed that CiteSpace can effectively help scholars discover research trends and visualize them. Therefore, this paper provides an in-depth analysis of the current state of research on construction risk assessment with the help of CiteSpace software (6.1. R6 (64-bit) Basic). The time threshold for CiteSpace was set to 2012–2022, and one year was selected as the time slice. Then, tick the options “Pathfinder”, “Pruning sliced networks”, and “Pruning the merged network” to remove redundant information and ensure the clarity of the map.
Two quantitative CiteSpace metrics are frequently mentioned in the subsequent procedure: intermediary centrality and burst strength [51,52]. Centrality is a value in network analysis that considers the role of the mediator in connecting pairs of nodes in the network [53]. It measures the extent to which nodes facilitate communication or interaction between other teams of nodes in the network. According to Chen (2016), a node is crucial if its mediated centrality is more significant than 0.1 [42]. Burst strength can be used to identify research areas with a sudden increase in activity or interest that may signal emerging trends or significant breakthroughs, thus helping researchers identify research directions worthy of further exploration [48,54].

2.2. Database Selection and Paper Search

Web of Science (WoS), one of the world’s most widely used bibliographic databases, provides access to a large body of scholarly research literature in various fields of study [55,56]. Web of Science indexes thousands of scholarly journals, conference proceedings, books, and other academic sources, facilitating literature reviews [57]. The combination of WoS and CiteSpace was heavily utilized in numerous influential review articles. For instance, some academics utilized it as a search tool to collect literature on green buildings and discuss the shortcomings of current developments [58]. Others analyzed the literature on sustainable urbanization using the WoS database and emphasized the value of combining bibliometrics with CiteSpace software [53]. Consequently, the WoS database served as the search source for this paper, and the collected search results were utilized for bibliometric analysis.
“Construction safety risk assessment” and “Construction safety risk evaluation” were some of the search terms used to find articles in the field of construction risk assessment. The type of literature was then set to “journal articles”, the language to “English”, and the field of expertise to “civil engineering” to ensure the high quality of the data source. In addition, the articles’ period was set to 2012–2022 to ensure the cutting-edge nature of the articles. Then, 496 papers were initially selected. However, bibliometric analyses heavily rely on accurate metadata, such as author names, publication titles, abstracts, year of publication, and citation information. If any of these key metadata are missing, incomplete, or incorrectly formatted in the WoS data export, the bibliometric software may have difficulty correctly processing the data. We manually screened and excluded 23 papers with incomplete data to ensure the validity of the analysis, so the final number of documents used for bibliometric analysis was 473.

3. Results

3.1. Overview of Selected Publications

3.1.1. Average Annual Publication

To predict research trends, we need to know how many articles are published annually [59]. Based on the Web of Science’s search data (Retrieved 17 January 2023), Figure 3 shows that construction risk assessment publications experienced a steady increase until 2017. After 2018, the number rapidly rose and peaked in 2021 at 105. There was an overall upward trend in the number of articles published.

3.1.2. Major Sources

Most articles on construction risk assessment are published in internationally renowned journals, indicating that construction risk assessment is currently a topic of interest. Table 1 summarizes the journals that have published more than five articles, with the top three being the Journal of Construction Engineering and Management, Automation in Construction, and Advances in Civil Engineering and Buildings, the first two of which have an overwhelming numerical advantage in terms of publications at 58 and 55, respectively. However, the other journals on the list are also essential publishing platforms.

3.2. Co-Authorship Analysis

Co-authorship analysis can be used to investigate the most populated nations, institutions, and authors in the chosen literature and their collaborative relationships [60,61]. This section identifies the major contributing countries, institutions, and authors to the field of construction risk assessment based on co-country, co-institution, and co-author analysis from a macro-to-micro perspective.

3.2.1. Analysis of Country

Co-country analysis can quantify spatial article distribution [62]. Figure 4 depicts a network of 64 nodes and 67 links containing the primary contributing countries in the field. The nodes in the network represent individual nations, the size of the nodes is proportional to the number of publications per nation, and the outer purple circle of the nodes reflects the strength of mediated centrality. China has the most articles, followed by the United States, Australia, Canada, and Korea. Mediation centrality indicates the significance of a network node. England has the most extraordinary centrality, followed by Portugal, Scotland, France, and Singapore. They are international cooperation leaders.
Table 2 provides information on the top 10 countries regarding frequency and centrality. Notably, most of the top 10 countries are developed, as these nations pioneered research on construction risk assessment. England and Italy are at the heart of the list regarding centrality and frequency, indicating that these two countries play an essential role in this field. In addition, developing countries, represented by China, Iran, Malaysia, India, Chile, and Brazil, are gradually increasing their influence in this field. Although many articles were published in countries such as China, the United States, and Australia, an increased need for international cooperation has emerged in recent years.

3.2.2. Analysis of Authors

Co-author analysis aims to reveal the influential authors and their collaborative relationships with each other [63]. By monitoring their research interests, knowledge area research trends can be uncovered. The co-authorship network of the principal authors is depicted in Figure 5. This network’s threshold value is set to two consisting of 310 nodes and 245 links; the node size represents the frequency of each author’s publications, and the links between nodes illustrate the authors’ collaborative relationships. There are several complex research groups in the field of construction risk assessment, centered on those of Zhang Limao, Wu Xianguo, Li Heng, Jeong Jaewook, and others. Many groups are from China, such as those of Xue Yiguo, Liu Yang, Qiu Daohong, and Su Maoxin. There are groups from other nations, such as those of Han SangUk, Abourizk Simaan, and Han SangHyeok.
The top 10 authors in terms of frequency of articles are shown in Table 3. Li Heng is the most published author, followed by Zhang Limao and Wu Xianguo. They are all from China, reflecting researchers’ vital interest in construction risk assessment. Umer Waleed, Antwi-afari, Al-hussein, Jeong, Abourizk, Han, and Yu are crucial linkages among the research groups, each with five (authors are ranked 4–10, in no particular order). They are playing an essential role in advancing the field of construction risk assessment. Therefore, all these authors deserve more attention.

3.3. Co-Term Analysis

Keywords summarize the main ideas of a whole research article, so they can be used to find research hotspots [64,65]. Furthermore, keyword popularity fluctuates over time, and keyword evolution analysis can reveal research trends [66].

3.3.1. Analysis of Keyword Cluster

Figure 6 shows the keyword clustering graph generated by CiteSpace, with 362 nodes and 663 links, which indicate current research hotspots. Cluster #1 is “multi-objective optimization”. Multi-objective optimization balances multiple conflicting objectives to find the best solution [67]. These objectives include cost, schedule, and quality; the optimization process involves using mathematical algorithms to evaluate different scenarios and determine the best trade-off between objectives [2,68]. Clusters #2 and #3 are “risk management” and “risk assessment”. Risk management and risk assessment are closely related concepts. Risk assessment involves identifying, assessing, and prioritizing potential risks associated with a project [69]. Risk management manages the uncertainty associated with threats through risk assessment or other tools [70]. Cluster #4 is “mechanical characterization”. Mechanical characterization is primarily used to assess the mechanical properties of building materials and components, including the ability to withstand various loads and stresses [71]. This information helps identify potential design weaknesses and provides information on the strength and stability of the materials and structures used [72,73]. Cluster #5 is “construction safety”. Safety remains an urgent issue in the construction industry, as it is not only detrimental to the health of the industry but also causes many casualties and economic losses [74,75]. Cluster #6 is “accident prevention”. Accident prevention is essential to construction risk assessment [76]. It aims to eliminate or mitigate accidents before they occur by analyzing past accidents and incidents to identify trends and patterns and conducting site inspections to identify potential hazards [77,78]. Cluster #7 is “worker”. It indicates that human factors are still the primary source of risk [79,80]. Cluster #8 is “fire spalling”, which refers to the surface cracking and spalling of concrete or masonry materials due to internal pressure expansion caused by high heat [81]. Fire spalling is considered a potential risk to the stability and safety of buildings in construction risk assessments [82]. Cluster #9 is “seismic”. Seismic activity is an essential factor in risk assessment [83,84]. The assessed factors include the construction site’s location, the likelihood of seismic activity, and the potential intensity of the earthquake [85]. Cluster #10 is “computer vision”. Computer vision can analyze images and detect potential hazards and risks such as unstable terrain, unsafe structures, and equipment failures. At the same time, it can also be used to monitor workers and detect unsafe behavior [86]. Cluster #11 is the “construction industry”. Construction risk assessment contributes to a better understanding of the safety risks in the construction industry and, thus, to the construction industry’s health [87,88]. Clustering #12 is “machine learning”. Machine learning can be applied to construction risk assessment to automate processes and improve their accuracy and efficiency [89,90]. It can rapidly analyze large volumes of data to provide more comprehensive and accurate insights into potential risks [91,92]. Cluster #13 is “compressive strength”, a key indicator for construction materials, as it is often used to evaluate the load-bearing capacity of building materials such as concrete and bricks [93,94]. This information is essential to determining the safety and stability of a structure and is used to assess the risk of failure or collapse [95,96]. Cluster #14 is “tunnel collapse”. Tunnel collapse risk is an essential concern for the construction industry [97]. Tunnel collapse can cause significant damage to the structure itself and the surrounding area and endanger the lives of workers and the public [98,99]. Cluster #15 is “optimized escape routes”. Optimized escape routes can reduce the likelihood of injury to workers in emergencies [100,101]. These escape routes are planned and designed with safety in mind, considering factors such as building layout, toxic gases, and visibility [102,103]. Cluster #16 is “stability against sliding”. Stability against sliding is a significant risk factor, as it determines the likelihood of a structure slipping or sliding in response to external forces such as soil erosion, wind, and earthquakes [104]. Such assessment factors include the soil type, foundation geometry, weight distribution of the structure, and material strength [105,106].

3.3.2. Analysis of Keyword Evolution

The keyword evolution network, as shown in Figure 7, reveals the keyword evolution trend during 2012–2022. The threshold value for this network was set to 10. The time associated with the nodes indicates the first occurrence of the keywords, and the size of the nodes is proportional to the frequency of the keywords. In 2012, the keyword “risk” appeared in abundance and continued to do so for a long time. Risk is becoming one of the leading research directions in the industry. At the same time, “BIM” and “AHP” are effective methods for addressing risk assessment [107,108,109]. The node size of “risk management” suggests that it received more attention than “risk assessment” at the time. In 2014, “Bayesian network”, “technology”, “tracking”, and “health” exploded with cumulative frequency, suggesting that many scholars are attempting to use Bayesian networks in risk assessment. In 2016, the terms “case study”, “climate”, and “labor and personnel” emerged, suggesting that real-world case studies explore the impact of labor and weather on construction risk. In addition, computer technologies such as “simulation”, “computer vision”, and “optimization” are beginning to be applied to risk prediction and assessment, optimizing some traditional risk methods. In 2020, a growing number of keywords, such as “earthquake”, “risk identification”, “mixed reality”, “neural networks”, “fragility curve”, and “machine learning”, do not frequently appear. This reflects that research interests have become diverse and fragmented in recent years. These directions are likely to become the focus of future research in the field.

3.3.3. Analysis of Partner Institutions

The network of co-occurring institutions is shown in Figure 8. The threshold value for this network is set to 2. It has 274 nodes and 199 links; the links between the nodes indicate collaboration between institutions. Most institutions are universities, such as the Huazhong University of Science and Technology, the Hong Kong Polytechnic University, the University of Alberta, Tongji University, and Tsinghua University, which are network cores, forming several large research communities. For example, the Huazhong University of Science and Technology, the Hong Kong Polytechnic University, the University of Alberta, the Polish Academy of Science, the Nanyang Technology University, and other institutions form one of the largest research chains. Smaller research collaborations exist, for example, between the Delft University of Technology, the Autonomous University of the State of Mexico, and the Netherlands Organisation for Applied Scientific Research TNO. In addition, there needs to be more external collaboration at about 20 institutions. In the future, cooperation between institutions must be bolstered to expand the channels for disseminating research experience.
Table 4 lists the top 10 institutions in terms of frequency and centrality. The institution with the highest number of publications is the Huazhong University of Science and Technology, followed by the Hong Kong Polytechnic University, the University of Alberta, the China University of Mining and Technology, and Dalian University of Technology. Notably, the institutions with centrality above 0.05 are all from China: the Huazhong University of Science and Technology, the Hong Kong Polytechnic University, the University of Alberta, the China University of Mining and Technology, Tongji University, Tsinghua University, and the Georgia Institute of Technology, suggesting that their research work in this area is an outstanding contribution and deserves a higher degree of attention.

3.4. Co-Citation Analysis

CiteSpace software utilizes co-citation analysis to quantify the knowledge base, research hotspots, and trends [49]. When two articles about a third article appear together, they are called co-cited [110]. Following this section is a co-citation analysis of authors and the literature.

3.4.1. Analysis of Co-Cited Authors

As shown in Figure 9, the author co-citation network in this study has 474 nodes and 865 links, designed to filter out crucial information about the authors and their relationships. Only a few of the network’s nodes are more important, which shows that research in the field is concentrated. The thick lines between nodes reveal close relationships between the most cited authors. Among them, the top five authors in terms of mediated centrality are Chan Apc, Hallowell, Fema, Choudhry Rm, and Pearl J; the top five authors in terms of frequency are Hallowell, Zhang Lm, Hinze J, Mitropoulos P, and Ding Ly.
The top ten authors in terms of burst intensity are shown in Figure 10. Hinze J was the most frequently cited, followed by Baradan S, Rozenfeld O, Gambatese Ja, and Carter G. In addition, the authors with high burst intensity values were HSE, BLS, Patel Da, and Zhou ZP. The results show that these authors are essential in construction risk assessment. Considering the results of the author analysis in Table 5 and Figure 10, this study found that many authors, including Hallowell, Hinze J, Zhang Lm, Ding Ly, and Choudhry Rm, have been working on construction risk assessment for many years and have made significant contributions. Hinze J has a high co-citation frequency, centrality, and burst intensity frequency, indicating that many scholars recognized Hinze J’s research. Their research continues to have a profound impact as a cornerstone of the current developments in construction risk assessment. Following the research work of these authors helps to acquire knowledge and capture future trends in the field.

3.4.2. Analysis of Co-Cited Clusters

The 10 most cited publications in construction risk assessment are shown in Table 6. Most of the most cited articles focus on models that explore human factors. For example, Aryal et al. (2017) found that fatigue significantly contributed to increased accident risk in construction and proposed a new method for the real-time monitoring of physical fatigue in construction workers using wearable sensors [111]. Wu et al. (2015) considered the causal relationships and interactions between personal safety performance evaluation (PSPE) objectives and implementation factors [112]. They constructed an assessment method based on structural equation modeling (SEM). Case studies are a very effective assessment tool. Raviv G et al. (2017) implemented the Analytic Hierarchy Process (AHP) and case studies to assess quantitative outcome severity level values, revealing the inter-relationship between technical and human factors in tower cranes [113]. Hallowell et al. (2013) identified over 50 active safety indicators through case studies, the content analysis of award-winning projects, and expert discussion [114]. With the development of computer technology, the application of artificial intelligence, sensing technology, and imaging technology has also attracted significant attention. For example, Ilbahar et al. (2018) applied the Pythagorean fuzzy proportional risk assessment (PFPRA) to occupational health and safety risk assessment [115]. Fang et al. (2018) proposed a risk assessment method based on an extended form of fuzzy logic and a Bayesian belief network (BBN) to capture the inter-relationships of various risks better [116]. In addition, some scholars also used sensing devices to record participants’ positions, postures, and images to assess their risk levels [117,118]. Zhang S et al. (2013) tried to solve the problem by performing automatic safety rule checks on Building Information Models (BIM) [119]. Zhou et al. (2015) discussed using innovative technologies in building safety and the flow of safety information [120]. Thus, the interplay between risk factors and the application of new computer technologies are the central research themes of these highly cited articles.
Using CiteSpace’s cluster analysis, quantitative analysis of co-cited references can reveal the primary trends in each field [121]. CiteSpace proposes two metrics, the mode value (Q-value) and the average profile value (S-value), based on the clarity of the network structure and clustering, as indicators of validity [122]. Generally, a Q-value of [0, 1] generates significant clustering graphs when the Q-value exceeds 0.3; clustering is efficient and convincing when the S value is 0.7. Clustering is usually considered reasonable if the Q-value exceeds 0.5 [123]. This study reveals the current hotspots and future trends in construction risk assessment. In this paper, co-cited references were, therefore, evaluated for clustering, and keywords were collected as clustering labels. Figure 11 depicts the cluster analysis graph as a co-citation reference network with 422 nodes and 854 links. The graphs of cluster analysis with Q = 0.8252 and S = 0.9246 reveal a significant and well-clustered clustering structure. The cluster analysis produced a total of nine primary clusters.
The size of the nodes in the timeline plots shows how many co-cited references each cluster has [42]. As shown in Figure 12, nine clusters have the highest frequency of co-citations, indicating that they are the most popular topics in the field. The average year that each cluster appears shows how the clusters change and grow over time. Before 2015, scholars researched labor and personnel issues, like how construction workers were treated. Most of these studies used traditional case study methods. From 2015 to 2020, scholars began to use construction projects. After 2020, most scholars explored how to assess construction risks more accurately and quickly by incorporating deep neural networks.
Since other clusters are rare after 2020, this paper focuses on cluster #0 (deep neural network). Deep learning algorithms have gained widespread popularity in the last decade [124]. They have a multilayer architecture, with each layer constituting a nonlinear information processing unit [125]. In contrast, deep neural networks (DNNs) use a deep architecture in NNs, where the more layers and units there are in a single layer, the higher the complexity of the representation function is [126,127]. The superior performance of a DNN comes from its ability to statistically learn from a large amount of data to obtain an efficient representation of the input space. DNNs can include network types such as feedforward networks, convolutional neural networks (CNNs), recurrent neural networks (RNNs), and generative adversarial networks (GANs) [128,129,130].
Recently, this approach was increasingly applied to construction risk assessment. For example, deep neural network models can improve the performance of automatic pose recognition of wearable IMU outputs [131]. Isah et al. (2021) developed DNN models to assess the impact of risk on the schedule and the cost performance of road projects [132]. Deep neural networks (DNNs) were also used for construction cost estimation and were found to perform slightly better than other machine learning tools [133]. In addition, scholars also combined graph convolutional networks (GCNs) to account for information on the dependencies between construction accidents [134]. Kim et al. (2022) developed a deep learning model for predicting sustainable construction safety accidents [135]. They found that, compared to traditional multiple regression models, deep neural networks (DNNs) performed better regarding the mean absolute error. Pan and Zhang (2022) proposed a data-driven approach based on deep neural networks and gradient descent techniques for developing meaningful tunnel safety and security strategies that rely on something other than time-consuming and laborious manual assessments [136]. Regarding accident losses, construction site financial loss models were also developed based on construction site financial loss data and deep learning algorithms [137,138]. Deep learning models can automatically learn hierarchical features from raw data, thus eliminating the need for manual feature engineering that is often required in traditional machine learning methods; it also supports end-to-end learning, which means that the model learns from the raw inputs and produces the desired outputs directly, simplifying the design of complex systems [139,140,141].
Although much has been achieved in this area, many areas remain for further improvement. First, historical loss data may not be available or are insufficient in some developing countries, making it hard to obtain the needed database DNN models [138]. Second, there are data on accidents, but the different ways they are recorded make it hard to effectively use them [139]. Also, traditional neural network models could be easier to understand, so many researchers are working on new algorithms to make them easier to understand and make better predictions [142,143]. Scholars are also trying out different control methods [144]. This is because all models need help with overfitting or being more general. Due to this and deep neural networks always getting better, it is becoming an essential method of evaluating construction risk.

4. Discussion

In the field of construction risk assessment, there have been a lot of changes and new research directions in the past few years. Here are some possible directions for future research in construction risk assessment based on what we learned in the previous sections.
  • Data-driven and AI: The increased availability of data and the adoption of digital tools such as Building Information Modeling (BIM) and Internet of Things (IoT) devices enable more comprehensive risk assessments [145,146]. Real-time data on project schedules, environmental factors, and equipment performance can provide valuable insights for effective risk identification and the mitigation to AI [141,147].
  • Blockchain and cloud computing: More construction project data are becoming available, and cloud computing makes it possible to find new ways to collect, analyze, and visualize large amounts of data for construction risk assessment [148,149,150]. Blockchain technology can also make secure, transparent, and tamper-proof systems for recording and tracking information about construction risk [151,152].
  • Enhanced collaboration and stakeholder engagement: Effective risk assessment requires the collaboration and input of a variety of stakeholders, including contractors, architects, engineers, and owners [153,154]. Future approaches to risk assessment are likely to emphasize improved collaboration and stakeholder engagement using cloud-based platforms, virtual reality (VR), and augmented reality (AR) tools [155,156]. These technologies can facilitate real-time communication, the better visualization of risks, and enhance the decision-making process.
  • Focus on sustainability and resilience: The construction industry is placing increasing emphasis on sustainability and resilience in building design and construction practices. Risk assessment needs to address these factors by considering the potential risks associated with climate change, extreme weather events, resource scarcity, and social impacts [157,158]. Assessing the resilience of buildings and infrastructure regarding these risks is essential to ensure long-term performance and minimize adverse impacts.
  • Regulatory requirements and the impact on the insurance industry: As regulatory regulations in the construction industry evolve, risk assessment methods need to be accordingly adapted [159,160]. Regulators may require more stringent risk assessment practices to enhance safety, environmental protection, and compliance. In addition, insurers may influence risk assessment practices by requiring comprehensive risk assessments to accurately assess premiums.
Overall, the future direction of construction risk assessment involves leveraging technology, adopting a data-driven approach, integrating risk assessment throughout the project lifecycle, fostering collaboration, and addressing sustainability and resilience issues. These advances can enhance risk mitigation strategies, improve project outcomes, and contribute to greater efficiency and sustainability in the construction industry.

5. Conclusions

This paper uses the bibliometric and knowledge graph analysis tool CiteSpace to visualize and analyze 473 pieces of literature on construction risk assessment. The results show that the number of articles about construction risk assessment has increased. Most articles were published in the Journal of Construction Engineering and Management and Automation in Construction. In the co-authorship analysis, this study found that most publishing institutions are universities; the research labs and companies do not contribute as much as they could. The Hong Kong Polytechnic University, Tsinghua University, and the Huazhong University of Science and Technology all have much to offer and meaningfully work together. The most important contributions come from China, the United States, and Australia, far ahead of other countries. A group approach is also typical of the work that authors from different countries accomplish together. It is also important to note that China has many publications, but it needs to be more involved in communication and teamwork. In the co-term analysis, this study found that scholars in the last decade have focused on “multi-objective optimization”, “mechanical characterization”, “accident prevention”, “computer vision”, “machine learning”, and “tunnel collapse”, among 16 other topics. In the co-citation analysis, this study found that the research frontier is focused on the application of deep neural networks, with the trend being to improve the accuracy and interpretability of applications and to incorporate emerging technologies such as blockchain, the Internet of Things (IoT), and Building Information Modeling (BIM). The significance of the findings of this paper is that they can provide valuable insights into the current state of research in the field. By analyzing and synthesizing the latest developments and trends, researchers can better understand the field’s critical challenges, opportunities, and knowledge gaps. This can enable them to formulate more informed research questions, hypotheses, and methods and identify promising avenues for future research.
The limitations of this study should, likewise, be noted. First, the search source constrains the scope of the data. Other sources, such as Scopus and EI, may provide additional insights. In addition, different parameter settings may lead to different analysis results due to software limitations. Further research could apply systematic literature review techniques to delve into a particular type of construction or a specific application of an assessment method.

Author Contributions

Conceptualization, A.H.A. and Y.J.; methodology, Y.J.; software, Y.J.; validation, Y.J. and A.H.A.; formal analysis, Y.J.; investigation, Y.J.; resources, Y.J.; data curation, Y.J.; writing—original draft preparation, Y.J.; writing—review and editing, Y.J. and A.H.A.; visualization, Y.J.; supervision, A.H.A., N.A.H. and N.A.B.; project administration, Y.J. and A.H.A. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

The data used to support the findings of this study are available from the corresponding author upon request.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Statistics on construction safety accidents in Malaysia (2015–2021).
Figure 1. Statistics on construction safety accidents in Malaysia (2015–2021).
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Figure 2. Research flow chart.
Figure 2. Research flow chart.
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Figure 3. Number of publications per year in construction risk assessment research.
Figure 3. Number of publications per year in construction risk assessment research.
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Figure 4. Co-country network in construction risk assessment research.
Figure 4. Co-country network in construction risk assessment research.
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Figure 5. Co-author network in construction risk assessment research.
Figure 5. Co-author network in construction risk assessment research.
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Figure 6. Clustering of keywords in construction risk assessment research.
Figure 6. Clustering of keywords in construction risk assessment research.
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Figure 7. Timeline of keywords in construction risk assessment research.
Figure 7. Timeline of keywords in construction risk assessment research.
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Figure 8. Co-institution network in construction risk assessment research.
Figure 8. Co-institution network in construction risk assessment research.
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Figure 9. Authors’ co-citation network in construction risk assessment research.
Figure 9. Authors’ co-citation network in construction risk assessment research.
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Figure 10. Burst strength of authors’ co-citation in construction risk assessment research.
Figure 10. Burst strength of authors’ co-citation in construction risk assessment research.
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Figure 11. Cluster of authors’ co-citations in construction risk assessment research.
Figure 11. Cluster of authors’ co-citations in construction risk assessment research.
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Figure 12. Timeline of co-cited clustering in construction risk assessment research.
Figure 12. Timeline of co-cited clustering in construction risk assessment research.
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Table 1. Major journals in construction risk assessment research.
Table 1. Major journals in construction risk assessment research.
No.JournalNumberPercentage
1Journal of Construction Engineering and Management5811.69%
2Automation in Construction5511.09%
3Advances in Civil Engineering255.04%
4Buildings244.84%
5Construction and Building Materials224.44%
6Journal of Civil Engineering and Management224.44%
7Tunneling and Underground Space Technology224.44%
8Engineering Construction and Architectural Management214.23%
9Journal of Computing in Civil Engineering142.82%
10Structural Safety142.82%
11KSCE Journal of Civil Engineering112.22%
12Engineering Structures91.82%
13Journal of Management in Engineering91.82%
14Journal of Performance of Constructed Facilities91.82%
15Stochastic Environmental Research and Risk Assessment91.82%
16ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part A Civil Engineering81.61%
17Building and Environment81.61%
18Ocean Engineering81.61%
19Journal of Building Engineering71.41%
20Structure and Infrastructure Engineering61.21%
Table 2. Top 10 countries by frequency and centrality in construction risk assessment research.
Table 2. Top 10 countries by frequency and centrality in construction risk assessment research.
No.CountryFrequencyCountryCentrality
1China174England0.60
2USA96Portugal0.36
3Australia40Scotland0.35
4Canada36France0.24
5South Korea28Singapore0.22
6England22Malaysia0.2
7Iran20India0.19
8Italy19Brazil0.17
9Spain17Chile0.15
10Poland16Italy0.11
Table 3. Top 10 authors in frequency in construction risk assessment research.
Table 3. Top 10 authors in frequency in construction risk assessment research.
No.AuthorFrequency
1Li Heng10
2Zhang Limao9
3Wu Xianguo7
4Umer Waleed5
5Antwi-afari Maxwell Fordjour5
6Al-hussein Mohamed5
7Jeong Jaewook5
8Abourizk Simaan5
9Han SangUk5
10Yu Yantao5
Table 4. Top 10 institutions by number and centrality in construction risk assessment research.
Table 4. Top 10 institutions by number and centrality in construction risk assessment research.
No.InstitutionsFrequencyInstitutionsCentrality
1Huazhong University of Science and Technology23Tongji University0.07
2Hong Kong Polytechnic University21Tsinghua University0.07
3University of Alberta16Huazhong University of Science and Technology0.06
4China University of Mining and Technology7Central University of Finance and Economics0.06
5Dalian University of Technology7Hefei University of Technology0.06
6Islamic Azad University7University of Alberta0.05
7Tongji University7Broadvis Engineering Consultants0.05
8Tsinghua University7Hong Kong Polytechnic University0.04
9Georgia Institute of Technology6China University of Mining and Technology0.03
10National University of Singapore6Georgia Institute of Technology0.03
Table 5. Top 10 co-cited authors by frequency and centrality in construction risk assessment research.
Table 5. Top 10 co-cited authors by frequency and centrality in construction risk assessment research.
No.AuthorFrequencyAuthorCentrality
1Hallowell49Chan Apc0.23
2Zhang Lm47Hallowell0.21
3Hinze J34Fema0.19
4Mitropoulos P33Choudhry Rm0.18
5Ding Ly30Pearl J0.18
6Zadeh La26Ding Ly0.17
7Choudhry Rm25Zhang Lm0.15
8Zhang Sj23Abdelhamid Ts0.14
9Teizer J23Chen Cx0.14
10Fang Dp21Chi S0.13
Table 6. Top 10 articles in frequency in construction risk assessment research.
Table 6. Top 10 articles in frequency in construction risk assessment research.
No.FrequencyArticles
111[111]
211[112]
310[115]
48[116]
58[118]
68[119]
78[113]
87[114]
97[120]
107[117]
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Junjia, Y.; Alias, A.H.; Haron, N.A.; Abu Bakar, N. A Bibliometric Review on Safety Risk Assessment of Construction Based on CiteSpace Software and WoS Database. Sustainability 2023, 15, 11803. https://doi.org/10.3390/su151511803

AMA Style

Junjia Y, Alias AH, Haron NA, Abu Bakar N. A Bibliometric Review on Safety Risk Assessment of Construction Based on CiteSpace Software and WoS Database. Sustainability. 2023; 15(15):11803. https://doi.org/10.3390/su151511803

Chicago/Turabian Style

Junjia, Yin, Aidi Hizami Alias, Nuzul Azam Haron, and Nabilah Abu Bakar. 2023. "A Bibliometric Review on Safety Risk Assessment of Construction Based on CiteSpace Software and WoS Database" Sustainability 15, no. 15: 11803. https://doi.org/10.3390/su151511803

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