Multi‑Dimensional and Multi‑Point Random Seismic Response Analysis of Long‑Span Cable‑Stayed Bridges at Different Sites

Authors

SHI Yi, College of Management and Engineering , Huaiyin Institute of Technology , Huai’an, Jiangsu 223003 , ChinaFollow
LU Lu, College of Management and Engineering , Huaiyin Institute of Technology , Huai’an, Jiangsu 223003 , ChinaFollow
FAN Shuli, School of Infrastructure Engineering , Dalian University of Technology , Dalian , Liaoning 116023 , China
SHEN Meng, College of Management and Engineering , Huaiyin Institute of Technology , Huai’an, Jiangsu 223003 , China
ZUO Chunyuan, College of Management and Engineering , Huaiyin Institute of Technology , Huai’an, Jiangsu 223003 , China
SUN Xinguo, College of Management and Engineering , Huaiyin Institute of Technology , Huai’an, Jiangsu 223003 , China
CAO Feifei, College of Management and Engineering , Huaiyin Institute of Technology , Huai’an, Jiangsu 223003 , China

Corresponding Author

陆路，男，博士，教授.E-mail：llzhxy@aliyun.com

Abstract

To study the random seismic response of long-span cable-stayed bridges at different sites，the site transfer function was used to evaluate the influence of different site conditions on ground motion propagation.By considering the traveling wave effect and the coherence effect，the multi-point power spectrum under different site conditions was generated.By using the pseudo excitation method for solving the absolute displacement，the seismic responses of cable-stayed bridges under uniform excitation and multi-dimensional and multi-point excitation at different sites were compared.A long-span cable-stayed bridge was selected as an example，and Ansys finite element software was used to analyze the random seismic response of the bridge.By considering the influence of site conditions on the seismic power spectrum，the random responses of the bridge under different excitation modes were calculated，and the power spectrum of each element of the bridge was extracted.The extreme root mean square of the power spectrum response was calculated.The results show that the amplification effect of soft soil on the random response of the bridge is about three times that of hard soil，and the amplification effect of multi-point excitation on the random response of the bridge is about 1.5 times that of uniform excitation.Therefore，the site effect has a great influence on the random seismic response of long-span cable-stayed bridges，and its influence cannot be ignored in bridge design.

Publication Date

10-28-2024

DOI

10.14048/j.issn.1671-2579.2024.05.017

First Page

158

Last Page

165

Submission Date

February 2025

Recommended Citation

Yi, SHI; Lu, LU; Shuli, FAN; Meng, SHEN; Chunyuan, ZUO; Xinguo, SUN; and Feifei, CAO (2024) "Multi‑Dimensional and Multi‑Point Random Seismic Response Analysis of Long‑Span Cable‑Stayed Bridges at Different Sites," Journal of China & Foreign Highway: Vol. 44: Iss. 5, Article 17.
DOI: 10.14048/j.issn.1671-2579.2024.05.017
Available at: https://zwgl1980.csust.edu.cn/journal/vol44/iss5/17

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