环形钢天桥人行舒适度分析与减振设计

Pedestrian Comfort Analysis and Vibration Mitigation Design for Circular Steel Overpass

摘要:

为解决某主干道十字路口环形钢天桥人致振动过大及舒适度不足的问题，采用有限元软件分析结构振动特性，对比主梁刚度、墩梁固结形式及环形闭合与否的影响；依据德国《人行桥设计指南EN03》进行舒适度评价；针对竖向基频不满足国内规范限值的情况，设计调谐质量阻尼器（tuned mass damper，TMD）进行减振控制。结果表明主梁刚度与支承形式对自振频率影响显著，TMD有效控制了竖向峰值加速度响应，使其满足舒适度要求，可为同类环形钢天桥的设计与振动控制提供借鉴。

Abstract:

To address the issues of excessive human-induced vibration and insufficient comfort in a circular steel overpass at a major road intersection, the finite element software is used to analyze the structural vibration characteristics, and to compare the impacts of girder stiffness, pier-beam consolidation forms, and whether or not the ring is closed. Comfort is evaluated according to the German Guideline for the Design of Footbridges EN03. In response to the vertical fundamental frequency not meeting the domestic code limits, a Tuned Mass Damper (TMD) is designed for vibration control. The results indicate that the girder stiffness and the support forms significantly influence the natural frequencies, and the TMD effectively controls the vertical peak acceleration responses, meeting the comfort requirements, which provides a reference for the design and vibration control of similar circular steel overpasses.