Evaluation of Ride Comfort under Vortex-Induced Vibration of Long-Span Bridge

Round 1

Reviewer 1 Report

1. All the images are low resolution. All the images should be improved.

2. No describe of vehicle dynamic model. Please provide dynamic equations and show how to implement the road input and how what parameters are measured from the model.

3. Table 5 and 6 may be not a good way to present the results.

4. How do you verify the simulate?

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

In this paper, the authors present a road-bridge-vehicle vibration model, proposing an evaluation method for assessing ride comfort during vortex- induced vibrations in long-span bridges. Subject is interesting for the field of civil engineering and transport and falls within the journal topic. However, despite of the paper title Evaluation of ride comfort under vortex-induced vibration of long-span bridge and the authors’ claim in Abstract, there is no bridge model, no vortex and no moving vehicle-bridge interaction in the main text. Excitation due to the vortex is just a simple harmonic time series which is questionable as long as the natural frequencies of the bridge are so close each other as they are in table 4. On the other hand, the bridge vibration is more complex then described in Eq. 30, because both bending, and torsion modes are excited by the vortex. Furthermore, Eq. 30 is not consistent with the model vehicle which admit the roll motion of the carbody which can be excited by the bridge torsion. All above represent a serious problem and because of this the paper doesn’t meet the standard for publication.

Other issues:

1.      Novelty of the article described at the end of the introduction is not convincing and therefore it should be detailed.

2.      The model of the vehicles is not proper presented.

3.      Lines 277-280: some references are dedicated to the comfort in the railway vehicles and this aspect should be précised to avoid the confusion because the paper is dedicated to the comfort in vehicles (automotive).

4.      Parameter values of the model considered in the numerical application are missing.

5.      There is no reference to Fig. 4. in the text.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 3 Report

This paper attempted to evaluate the ride comfort under vortex-induced vibration of a long-span bridge. Specifically, two criteria, including the overall vibration total value and motion sickness incidence, are proposed. The paper contains valuable information that is worthy to be published. The following issues may be considered before the acceptance of this paper.

1. Line 46-48, references should be provided for these VIV cases.

2. Line 55, the reviewer feels that VIV of a bridge is irrelevant to long-term physical damage since a vehicle typically passes a bridge in a short time.

3. VIV is assumed as a harmonic vibration in this study. While this seems a reasonable assumption for the purpose of this study, the authors should clarify there are some enhanced methods to calculate the VIV response with improved accuracy, e.g., Aerodynamic damping models for vortex-induced vibration of a rectangular 4: 1 cylinder: Comparison of modeling schemes.

4. The limitations of the proposed criteria should be clarified. For example, the motion sickness is dependent on a lot of factors including the tolerance of the driver. The authors should properly explain the limitations of the criteria.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

Manuscript has been sufficiently improved for publication in the journal.