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人行桥人致横向振动及横向锁定分析

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为了研究人群荷载下人行桥的人致振动特性,采用Duhamel积分求解了行人上下桥过程中简支梁桥的人致横向振动理论解,分析了横向锁定条件和临界人数.结果表明:与原地踏步相比,行人上下桥过程中,桥梁横向振动响应增大;频率比为 1.0 时,跨中横向加速度最大,产生横向锁定的同步临界人数最少;随着桥上总人数增加,跨中横向加速度最大值线性增加,但超过临界人数后由于同步概率的增加使增长幅度提高;在临界人数附近桥梁发生横向锁定,行人舒适性接近"较差"等级下限值.
Analysis of human-induced lateral vibration and lock-in phenomenon on footbridge
In order to study the human-induced lateral vibration performance of footbridge under crowd load,the theoretical solution to human-induced lateral vibration in the process of pedestrian getting on and off a simply supported bridge was solved by using Duhamel integral,and lateral lock-in conditions and critical number were analyzed.The results show that the lateral vibration response of bridge increases when considering the process of pedestrian getting on and off the bridge in comparison with the state of standing still.When the frequency ratio is 1.0,the lateral acceleration at the mid span is the largest,and the critical synchronous pedestrian number causing lateral lock-in is the smallest.With the increase of total pedestrian number on bridge,the maximum lateral acceleration at the mid span increases linearly,but after exceeding the critical pedestrian number,the increase magnitude rises due to the increase of synchronization probability.The lateral lock-in phenomenon occurs near the critical pedestrian number,and the pedestrian comfort is close to the lower limit of"poor"level.

footbridgehuman-induced lateral vibrationpedestrian lateral forcelateral vibration accelerationhuman-bridge interactioncritical pedestrian numberlateral lock-inpedestrian comfort

王泽涵、李晨光、许雅倩、陈鹏

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东南大学 土木工程学院,江苏南京 211189

西澳大学工程学院,西澳大利亚州珀斯WA6009

中国铁路设计集团有限公司土建工程设计研究院,天津 300308

中建路桥集团有限公司,河北 石家庄 050001

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人行桥 人致横向振动 行人横向力 横向加速度 人-桥相互作用 临界人数 横向锁定 舒适度

国家自然科学基金项目河北省大型结构健康诊断与控制重点实验室开放基金项目中建路桥集团科技计划项目

5177837KLLSHMC2112G03D20201120

2024

10.7688/j.issn.1000-1646.2024.04.16

沈阳工业大学学报
沈阳工业大学

沈阳工业大学学报

CSTPCD北大核心
影响因子：0.62
ISSN：1000-1646
年,卷(期)：2024.46(4)
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