柔性人行悬索桥竖向自振特性及人致振动试验研究

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中图分类号：U448.25 文献标志码：A 文章编号：1008-0562（2025）04-0471-10

ZHANGYanling，IXuan，YANGYanlong，etalExperimentalresearchonverticalnaturalvibrationandhuman-inducedvibationof flexiablesuspsifotbdgeJouaofonghicalUvesityaturlce）44）：74O issn.1008-0562.20240417

Experimental research on vertical natural vibration and human-induced vibration of flexible suspension footbridge ZHANG Yanling1²，LI Xuan1²， YANG Yanlong¹²， ZHU Lianren1，²，ZHANG Xu1，2*

（1.SchoolofCivil Engineering，Shijiazhuang Tiedao University，Shijiazhuang O5oo43，China;2.Key laboratory of Roads and Railway Engineering Safety Control of Ministry of Education， Shijiazhuang Tiedao University， Shijiazhuang O5oo43， China）

Abstract：Regarding the pedestrian-induced vibration issues offlexible foot suspension bridges，although there are many literatures have conducted vibration tests on pedestrianbridges，there is stillrelatively litleresearch focusing on multiple and high-order order resonances.By conducting natural vibration tests and human-induced vibration tests on a suspension footbridge spanning the rooftopof buildings，the operation status and pedestrian comfort were evaluated，and the high-order resonancecharacteristics were studied combining the finite element analysis under the spring mass damping （SMD） model of the pedestrian.The results show that when pedestrians cross bridges with different resonant step frequencies，there is a great correlation between the acceleration time history and the shape of the resonant mode.The high-order resonant step frequencies and their half and double frequencies，and the step frequencies close to low-order modal frequencies can excite significant responses.The maximum acceleration is accompanied byan overallincreasing trend in the number of people.The structural dampingwill increasewhentheaccelerationis high，andconsidering itsimpact，thebridgeis inacomfortable state for pedestrians within the pedestrian densities ranging from 0.2 to 1.5 persons per square meter. The conclusions of this study provideatheoretical foundation for elucidating the mechanismof high-order pedestrianinduced resonance in flexible pedestrian bridges.

Keywords：suspension footbridge；human-induced vibration;natural vibration characteristics；higher-order resonance;pedestrian comfort

0引言

人致振动是影响人行桥正常使用和行人舒适度的主要因素。（剩余12927字）