多人-桥竖向动力相互作用研究

谢伟平,汤宗恒,何卫

振动与冲击 ›› 2020, Vol. 39 ›› Issue (11) : 76-82.

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PDF(898 KB)
振动与冲击 ›› 2020, Vol. 39 ›› Issue (11) : 76-82.
论文

多人-桥竖向动力相互作用研究

  • 谢伟平,汤宗恒,何卫
作者信息 +

Study on vertical vibration of bridge-pedestrians dynamic interaction system

  • XIE Weiping, TANG Zongheng, HE Wei
Author information +
文章历史 +

摘要

基于弹簧-质量-阻尼行人动力模型及欧拉梁人行桥模型建立人行桥-多人耦合系统相互作用模型。通过实验室一低频型钢混凝土人行桥模型开展多人行走试验,验证了相互作用模型的有效性和适用性。采用状态空间法求解行人过桥时系统的瞬时模态,分析了不同人群密度下人群随机行走对人行桥动力特性的影响。对人群随机行走,还分析了不同人群密度和随机步态参数(步频、上桥时距和起步相位)对结构动力响应的影响。结果表明:考虑人群-人行桥相互作用,随着桥上行人密度的增大,人行桥基频略有降低,阻尼比显著增大;结构响应并不是逐渐递增的,其中考虑步频的随机性对响应均值的影响最大。

Abstract

Based on Spring-Mass-Damper pedestrain dynamic model and Euler-Bernoulli footbridge model, moving pedestrians-bridge coupled model was established. The coupled model was verified and calibrated by measuring footbridge vibration response caused by multiple people walking on the steel reinforced bridge of low frequency. The state-space method is adopted for the solving of the instantaneous modal of coupled system, then the influences of the dynamic properties of footbridge under stochastic walking loads and different crowd density were analyzed. For the crowd random walk, the effect of different crowd density and random gait parameters(gait frequency, time interval on bridge and initial phase angle)on the dynamic response of the structure is also discussed. The results indicate that the fundamental frequency of the footbridge is reduced slightly and the damping ratio is increased obviously When considering the moving crowd-bridge dynamic interaction in the vertical. Moreover, the structural response is not gradually increasing, in which the randomness of step frequency has the greatest influence on the mean value of response.

关键词

多人-桥耦合模型 / 人群-桥相互作用 / 模态分析 / 随机行走参数 / 实验验证

Key words

walking persons-bridge coupling model / crowd-bridge dynamic interaction / modal analysis / random walking parameters / experimental verification

引用本文

导出引用
谢伟平,汤宗恒,何卫. 多人-桥竖向动力相互作用研究[J]. 振动与冲击, 2020, 39(11): 76-82
XIE Weiping, TANG Zongheng, HE Wei. Study on vertical vibration of bridge-pedestrians dynamic interaction system[J]. Journal of Vibration and Shock, 2020, 39(11): 76-82

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