Analytical Model for the Prediction of Instantaneous and Long-Term Behavior of RC Beams under Static Sustained Service Loads

Round 1

Reviewer 1 Report

1. In abstract "RC", this abbreviation should be defined first. 

2. In introduction line 35 "RC, members [1, 3, 5, 7, 10]", the references need to be arranged in order . 

3. Previous works for the following topic should be discussed in introduction. at least 20 articles related to the creep of concreate can be added. 

4.  Bridge the novelty of current analysis with recent articles through last two years and present this novelty in introduction and abstract clearly.   

5. Equations can be rewritten in professional way (by equation editor, .....etc)

6. Equation can be cited by suitable references. 

7.  In abstract you wrote "analytical model was developed based on Bernoulli’s theory and the global equilibrium of the RC beam. A Newton-Raphson algorithm was also proposed", however in modeling section, I did not find any of them. In additional, I did not find a closed form solution for your equation. Please add and discuss.

8. High resolution plots should be added (for example update figure 6 )

9.  More physical explanations should be added in discussion. 

 

 

 

"

Author Response

The reviewers' excellent reports helped the authors improve the quality of the paper, thus they would like to thank them for that. The following table includes the authors' responses, and the changes were made immediately in the updated text.

Author Response File: Author Response.docx

Reviewer 2 Report

The authors proposed a theoretical model to predict the short term and long term deflection of reinforced concrete beams under service loads based on Bernoulli’s theory and the global equilibrium. The model takes into consideration the effect of creep on the behaviour of concrete both in tension and compression. The results showed good agreement between the proposed model and experimental  results in the literature.

The formulation is clear and the model is promising. However, the predicted experimental results in literature were not enough and I suggest adding more experimental results from the following references to get confidence with the model. These references also will enrich the literature in the introduction and the discussion:

Shaaban, I.G. and Mustafa, T.S., “Towards Efficient Structural and Serviceability Design of High-Strength Concrete T-Beams”, published in Proceedings of the Institution of Civil Engineers - Structures and Buildings online ahead of print, 1 August 2019, https://www.icevirtuallibrary.com/doi/abs/10.1680/jstbu.19.00081

Shallal, Muhaned. (2013). Prediction of Long-Term Deflection of Reinforced Concrete Beams Suitable for Iraqi Conditions. Journal of Babylon University/Engineering Sciences. 21. 1328-1347.

Shaaban, I. G., Saidani, M., Nuruddin, M.F., Malkawi, A. and Mustafa, T.S. “Serviceability Behaviour of Normal and High-Strength Reinforced Concrete T-Beams”, European Journal of Materials Science and Engineering (EJMSE) www.ejmse.tuiasi.ro, ISSN: 2537-4338, Volume 2, Issue 4, 2017, pp. 99-110.  http://www.ejmse.tuiasi.ro/articles/EJMSE_02_04_01_Shaaban.pdf

Kim SW, Kim KH. Prediction of Deflection of Reinforced Concrete Beams Considering Shear Effect. Materials (Basel). 2021 Nov 5;14(21):6684. doi: 10.3390/ma14216684. PMID: 34772209; PMCID: PMC8587569.

 

Author Response

The reviewers' excellent reports helped the authors improve the quality of the paper, thus they would like to thank them for that. The following table includes the authors' responses, and the changes were made immediately in the updated text.

Author Response File: Author Response.docx

Round 2

Reviewer 1 Report

The authors considered all comments. Therefore, the article can be accepted in the current form.