Vibration control of central buckles of long-span suspension bridge under random vehicle excitation

被引：0

作者：

Zhao, Yue ^{[1
]}

Huang, Pingming ^{[2
,3
]}

Fu, Yingzi ^{[1
]}

Yuan, Yangguang ^{[4
]}

Su, Botong ^{[1
]}

机构：

[1] College of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an

[2] Shaanxi Provincial Key Lab of Highway bridge and Tunnel, Xi'an

[3] College of Highway, Chang'an University, Xi'an

[4] School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an

来源：

Zhendong yu Chongji/Journal of Vibration and Shock | 2024年 / 43卷 / 13期

关键词：

beam end displacement; central buckle; fatigue life; suspension bridge; traffic load;

D O I：

10.13465/j.cnki.jvs.2024.13.031

中图分类号：

学科分类号：

摘要：

Vibration response of large-span suspension bridge under traffic load is obvious, and fatigue damage of key components directly affects structural service status and operational safety. Here, to reduce vibration response of large-span suspension bridge structure, the vibration control effects of flexible and rigid central buckles were studied based on finite element simulation. Effects of central buckles on structural modal characteristics were analyzed. Based on the random traffic flow simulation method considering parametric correlation and traffic flow parameters ' clustering characteristics, the control effects of central buckles under traffic flow load and their impact on the life of suspender steel wire were analyzed. The study results showed that central buckle mainly affects the antisymmetric vertical bending frequency and the first-order torsional frequency of suspension bridge, with increase in the number of flexible central buckles, bridge structural vibration frequency lifts, and the lifting effect of rigid central buckles is similar to that of three flexible central buckles; under the action of traffic flow, central buckle can significantly reduce beam end displacement, beam end cumulative displacement and cable-beam relative displacement; with increase in the number of flexible central buckles, the control efficiency lifts but the lifting effect gradually decreases; the control effect of rigid central buckles on beam end displacement and cumulative displacement is similar to that of three flexible buckles, and its control effect on cable-beam relative displacement is better than that of flexible central buckle; the fatigue life of suspender steel wire is consistent with the varying trend of bending stress response; the overall bending stress level of long suspender is relatively small, and central buckle has no obvious impact on its steel wire life; the fatigue life of short suspender steel wire lifts significantly, but increase in the number of flexible central buckles has limited lifting effect; the lifting effect of rigid central buckles is similar to that of three flexible central buckles. © 2024 Chinese Vibration Engineering Society. All rights reserved.

引用

页码：288 / 298

页数：10

共 28 条

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