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Open AccessArticle
Peer-Review Record

Effect of Cyclic Damage on the Performance of RC Square Columns Strengthened Using Hybrid FRP Composites under Axial Compression

Fibers 2019, 7(10), 90; https://doi.org/10.3390/fib7100090
Reviewer 1: Anonymous
Reviewer 2: Anonymous
Reviewer 3: Anonymous
Fibers 2019, 7(10), 90; https://doi.org/10.3390/fib7100090
Received: 17 September 2019 / Revised: 1 October 2019 / Accepted: 9 October 2019 / Published: 14 October 2019

Round 1

Reviewer 1 Report

The title of the manuscript is matched to its content.

The structure of the manuscript is proper.

The Introduction sufficiently covers the cases.

In the Reviewer’s opinion, the current state of knowledge relating to the manuscript topic

has been covered and clearly presented.

In the Reviewer’s opinion the manuscript should be published.

 

Author Response

We are thankful to the reviewers for their deep and thorough review. We have revised the manuscript carefully in light of their useful suggestions and comments. We hope our revision has improved the manuscript to a level of their satisfaction. 

 

The authors would like to thank the reviewer for the positive feedback about our work.

Reviewer 2 Report

See attached file.

Comments for author File: Comments.pdf

Author Response

General Comment:

This manuscript presents the results of 12 experimental compressive tests to evaluate the repair effect of pre-damaged plain and reinforced concrete columns. The comparison is made with regard to the stiffness, load-bearing capacity and ductility. The authors decided to use two different strengthening techniques NSM CFRP and hybrid FRP. The manuscript is well written, and the different methodologies are well explained (experimental tests, analytical approximation, numerical validation and parametric analysis). The comparison of results is also well justified. The manuscript requires minor corrections.

Response: The authors thank the reviewer for the positive feedback and valuable suggestions to enhance the quality of our work.

 

Specific Comments:

The numerical model requires more information regarding the material model used for steel (for example: hardening rule, yielding criterion).

Response: Thank you for this good suggestion. The details of the hardening rule, yield criterion for the concrete using the damage plasticity model is elaborated in section 6.1.1 of the revised submission.

 

The numerical model requires the definition of interpolating functions and the integration method used.

Response: As suggested by the reviewer, the details of the integration scheme and interpolation functions are added to section 6.2 of the revised manuscript.

 

More details about the loading condition are required for the numerical model (load applied to the top is insufficient).

Response: The corresponding information is added to section 6.3 of the revised manuscript.

 

More details about the convergence criterion are required for the numerical solution method.

Response: As suggested by the reviewer, the information regarding the convergence criteria is added to sections 6.1.1, and 6.4 of the revised manuscript.

 

Page 4 Table 1: Authors should verify if the rebar details are correct to the plain concrete specimens.

Response: The authors apologise for this inadvertent mistake. Table 1 is corrected in the revised submission.

 

Page 5 Figure 1: Modify to include the definition of “b” and “d”

Response: Revised as suggested.

 

Page 7 Line 138: Authors should present the details of data acquisition.

Response: Implemented as suggested.

 

Page 7 Line 140: Include the length of the specimen.

Response: Implemented as suggested.

Reviewer 3 Report

Very interesting paper, the experimental results concern with a particular type of columns:
the pre-damaged columns. I suggest only to enlarge the bibliography by
adding at least the following references regarding different constitutive laws
that could be adopted for the concrete:
Cavaleri, L., Trapani, F.D., Ferrotto, M.F., Davì, L. Stress-strain models for normal and high strength confined concrete: Test and comparison of literature models reliability in reproducing experimental results (2017) Ingegneria Sismica, 34 (3-4), pp. 114-137. Montuori, R., Piluso, V., Tisi, A. Comparative analysis and critical issues of the main constitutive laws for concrete elements confined with FRP (2012) Composites Part B: Engineering, 43 (8), pp. 3219-3230.

In addition, it could be very interesting if the authors recalled
the possibility of using the test results in order to make previsions also
for elements subjected to both axial load an bending moment, like reported
in the following paper:
Montuori, R., Piluso, V., Tisi, A. Ultimate behaviour of FRP wrapped sections under axial force and bending: Influence of stress-strain confinement model (2013) Composites Part B: Engineering, 54 (1), pp. 85-96.  

Author Response

General Comment:

Very interesting paper. The experimental results concern with a particular type of columns, the pre-damaged columns. I suggest only to enlarge the bibliography by
adding at least the following references regarding different constitutive laws
that could be adopted for the concrete:

Cavaleri, L., Trapani, F.D., Ferrotto, M.F., Davì, L. Stress-strain models for normal and high strength confined concrete: Test and comparison of literature models reliability in reproducing experimental results (2017) Ingegneria Sismica, 34 (3-4), pp. 114-137.

Montuori, R., Piluso, V., Tisi, A. Comparative analysis and critical issues of the main constitutive laws for concrete elements confined with FRP (2012) Composites Part B: Engineering, 43 (8), pp. 3219-3230.

Response: The authors thank the reviewer for the positive feedback and valuable suggestions to enhance the quality of our work. The suggested references have been added in the revised submission.

 

In addition, it could be very interesting if the authors recalled the possibility of using the test results in order to make previsions also for elements subjected to both axial load and bending moment like reported in the following paper: Montuori, R., Piluso, V., Tisi, A. Ultimate behaviour of FRP wrapped sections under axial force and bending: Influence of stress-strain confinement model (2013) Composites Part B: Engineering, 54 (1), pp. 85-96.

Response: Revised as suggested.

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