Effect of the Fire Modelling on the Structural Temperature Evolution Using Advanced Calculation Models

Round 1

Reviewer 1 Report

The main objective of this study is to compare the results in terms of gas temperature and structural elements temperature, using different localized fire models. The main novelty consists in studying the effect of the fire source modelling in CFD analyses. A simplified Hasemi localized fire model was first used for assessing the steel temperature of a typological steel-concreate beam followed by the computational fluid dynamics (CFD) models.

This paper is well-written and well-organized. It can be published only after addressing the following changes. Following are the comments for the authors to address:

1. The authors are advised to check the entire manuscript using a proof-reader to avoid grammatical mistakes. Check the spelling for ‘concrete’ on page 1 and line no 15.

2. The authors need to check lines 22-23 in the abstract which are abrupt and don’t carry any meaning.

3. The citation for [1] is wrong. It should be written as EN 1991-1-2 (2002) [1]. Check all the citations regarding the standards as per the journal format.

4. In the introduction the usage and its recent applications and recent experimental studies conducted by the previous researchers are missing which will highlight the key thrust area of this paper.

5. The research gap and the authors' current contribution are reported. These two sections need a few more explanatory sentences.

6. What does the ‘Figure 1. 3D analysed sub-structure model and the composite beam dimensions’ say? Denote the 2 figures separately and differentiate the same with a clear explanation of the 3D system. Similarly, Figure 2 same as above.

7. There are 2 methods adopted in this paper: 1) Heskestad model 2) Hasemi model and 3) CFD models- Provide proper citation for the above models with the benefits of the 3 models in sessions 3.1-3.3 

8.  The authors have failed to mention the standards by which the details mentioned on page 3, lines 101-107 regarding the steel-concrete composite beam sections are designed and the materials used in this geometry. This is the influencing parameter for the 3D analysis at a higher temperature.

9.  Add ‘XYZ’ coordinates to all the required Figures. Captions must be revised related to the irrespective Figures.

10. Provide a detailed explanation about how to measure a Heat Release Rate (HRR).

11. All the Figure’s citations are wrong and misplaced. Authors must cross-check Tables and Figures throughout the manuscript.

12. Table 1 citation is misleading the table, please cross-check.

13. Figure 8. Flame Evolution-Why this pattern analyzed for the time between 0s-3600s? If so mention the details in the text.

14. Authors must improve the discussion sections in the results and discussion. And add a few more literature to support their results.

15. Conclusion section must be revised. And provide the 5 key conclusions about the investigation.

16. Highlight the salient features of this Hasemi localized fire model their application, limitations, and the future scope of the study as a separate para above the conclusion.

17. The reviewer suggests that the authors need to revise the manuscript and present all the Tables, Figures, and captions as per the journal’s format and in order, as described inside the text.

18. Please conduct an extensive literature review. Some of the most relevant references which are not in the literature review section are:

1. Performance of Sustainable Insulated Wall Panels with Geopolymer Concrete.

2. Influence of Heating–Cooling Regime on the Engineering Properties of Structural Concrete Subjected to Elevated Temperature   

3. Collapse behaviour of a fire engineering designed single-storey cold-formed steel building in severe fires, Thin-Walled Structures 142, 340-357
4. On the fire behaviour of modular floors designed with optimised cold-formed steel joists   Structures 30, 1071-1085
5.  

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

Dear Authors,

This manuscript compared the results in terms of gas temperature and structural elements temperature, by different localized fire models. With reference to an open car park fire, the simplified Hasemi localized fire model was applied for evaluating the steel temperature of a typological steel-concrete beam. Then CFD models were used, varying the shape of the fire source. Generally, the manuscript presents a novel matter in the field of fire and can be published after considering minor revision.

-          There are some English language errors that can be addressed. Grammatical errors should be modified.

-          References are old. Further updated references particularly from the journal should be used.  example：

 https://doi.org/10.3390/fire6020055

https://doi.org/10.3390/fire6020053

https://doi.org/10.3390/fire4020027

-          There are not any effects of fire whirl and fire-wind in the manuscript. Why do the authors not consider such effects?

-          In the manuscript, three models have been expressed. It should expand further models. At least, present some of them as a source. 

Regards

 

Author Response

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Author Response File: Author Response.pdf

Reviewer 3 Report

• The manuscript is clear, relevant to the field and presented in a well-structured manner.
• The cited references are not recent publications (within the last 5 years). Please revised.
• The manuscript is scientifically sound and is the experimental design appropriate to test the hypothesis.
• Please highlight and justify your findings. 
• The figures are appropriate and easy to interpret and understand.
• The conclusions are consistent with the evidence and arguments presented. 

Author Response

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Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

Thanks, my comments have all been addressed. The paper can be accepted for publication.