The Effect of Viscous Dampers on the Seismic Performance of Curved Viaducts with the Combined Use of Steel Stoppers

Round 1

Reviewer 1 Report

The manuscript deals with the seismic performance assessment of a sample curved viaduct that is equipped with a viscous damper to evaluate the effect of the deck stopper on the global response of the bridge. I believe the topic is interesting and within the scope of the special issue. The paper is well-written and structured. However, there are some major vague points in the work, which should be clarified before publication. Therefore, I think a Major Revision of the manuscript is necessary by the authors. The detailed comments are as follows:

1-      In the introduction part, it is necessary to add more relevant and recent papers for the literature review purpose, especially about the application of the vibration control systems (isolation and viscous damping systems). Some of the recommended papers are:

·       Chen, X. and Xiong, J., 2022. Seismic resilient design with base isolation device using friction pendulum bearing and viscous damper. Soil Dynamics and Earthquake Engineering, 153, p.107073.

·       Khaloo, A., Maghsoudi-Barmi, A. and Moeini, M.E., 2020, August. Numerical parametric investigation of hysteretic behavior of steel-reinforced elastomeric bearings under large shear deformation. In Structures (Vol. 26, pp. 456-470). Elsevier.

·       Khedmatgozar Dolati, S.S., Mehrabi, A. and Khedmatgozar Dolati, S.S., 2021. Application of Viscous Damper and Laminated Rubber Bearing Pads for Bridges in Seismic Regions. Metals, 11(11), p.1666.

·       Maghsoudi-Barmi, A., Khansefid, A., Khaloo, A. and Moeini, M.E., 2021. Probabilistic seismic performance assessment of optimally designed highway bridge isolated by ordinary unbonded elastomeric bearings. Engineering Structures, 247, p.113058.

·       Maghsoudi-Barmi, A., Khansefid, A., Khaloo, A. and Ehteshami Moeini, M., 2021. Seismic risk assessment of optimally designed highway bridge isolated by ordinary unbounded elastomeric bearings. Journal of Numerical Methods in Civil Engineering, 6(1), pp.10-21.

·       Talyan, N., Elias, S. and Matsagar, V., 2021. Earthquake response control of isolated bridges using supplementary passive dampers. Practice Periodical on Structural Design and Construction, 26(2), p.04021002.

2-      In line 41: add the reference of Tian et al.

3-       What are the values of coefficients of equation 1?

4-      What are the values of K1, K2, F1, and F2 in Fig5-b?

5-      Where is the term related to the viscous damper in equation 2?

6-      The quality of Fig. 9 is poor.

7-      Why only 1 ground motion is defined? It is not enough, and the authors should add at least more 6 ground motions to their analysis and use the average of responses. Therefore, in the present form, the outcomes of the manuscript are not reliable at all.

 

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

The quoted bibliography on novelties (items 13-15) refers to publications from the years 2003-2010 relatively distant in time. There are more recent publications on research on viscous dampers and other seismic passive energy dissipation solutions. It needs to be developed/updated.

Numerical analyzes included in the work have not been subjected to practical verification - this is an important lack due to the possibility of errors in the analysis. It is recommended to continue research on physical objects/models (as a future development of this work).

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

No more comments.