基于随机行走模型的人致振动舒适度研究  

Human induced vibration comfort based on random walk model

作　　者：吴刚杰 陈得意 黄仕平[2] 李智海 WU Gangjie;CHEN Deyi;HUANG Shiping;LI Zhihai(School of Urban Construction,Yangtze University,Jingzhou 434023,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]长江大学城市建设学院,湖北荆州434023 [2]华南理工大学土木与交通学院,广州510640

出　　处：《振动与冲击》2024年第9期226-233,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(11911530692);湖北省教育厅科学研究计划(Q20221305)。

摘　　要：为研究人群密度对人行桥结构的振动影响,首先,建立了双向随机行走模型,推导了随机荷载作用下结构振动响应解析解;然后,对比分析了人群密度对结构振动响应的影响规律;最后,通过研究行人实感时程与总时程之间的相关关系,定义了舒适度放大系数,以荆州市某人行天桥为例,进行振动舒适度评价,验证了双向随机行走模型及舒适度放大系数的适用性。结果表明:人行桥结构加速度响应随人群密度增大呈现出先增大后减小的规律;行人实感时程与总时程具有显著的相关性,根据舒适度放大系数可建立对应关系;舒适度放大系数随着振动响应峰值的增大而减小,随着人群密度的增大而增大;该类结果对人行桥振动舒适度定量计算具有参考借鉴意义。Here,to study effects of crowd density on vibration of pedestrian bridge structure,firstly,a bidirectional random walk model was established,and the analytical solution of structural vibration response under random load was derived.Then,effects of variation of crowd density on structural vibration response were analyzed contrastively.Finally,by studying the correlation between pedestrian actual perception time history and the total time history,the comfort amplification factor was defined.Taking a certain pedestrian bridge in Jingzhou City,Hubei Province of China as an example,vibration comfort evaluation was performed to verify the applicability of the bidirectional random walk model and comfort amplification factor.The results showed that the acceleration response of the pedestrian bridge structure firstly increases and then decreases with increase in crowd density;pedestrian actual perception time history and total time history have a significant correlation,the corresponding relation can be established based on comfort amplification factor;comfort amplification factor decreases with increase in peak vibration response,and increases with increase in crowd density;the study results can provide a reference for quantitative calculation of vibration comfort of pedestrian bridges.

关 键 词：随机行走模型 振动响应 人行桥 舒适度放大系数 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]