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大跨度人行天桥振动舒适度分析
来少平,何文杰
摘 要

(奥雅纳工程顾问, 上海 200031)

[摘要]结合德国规范EN 03和国内有关舒适度分析的规范参数取值,对人行天桥在人行荷载作用下的振动舒适度分析过程进行详细解读,并通过一个项目案例在多种工况和多种阻尼比下的对比分析,得出以下结论:提高阻尼比可有效降低振动加速度;改变桥梁频率来减小振动加速度时需避开折减系数ψ的峰值区域;对舒适度要求比较高的桥梁建议预留TMD设置条件;建议结合桥梁人流分析结果确定不同的舒适度分析工况,并根据不同人流工况在桥梁使用期间发生的概率确定各自的舒适度级别。

[关键词]钢结构; 人行天桥; 自振频率; 舒适度

中图分类号:TU997文献标识码:A文章编号:1002-848X(2018)18-0048-05

 

Vibration comfort analysis on large-span pedestrian bridge

Lai Shaoping, Ho Desmond 

(ARUP, Shanghai 200031, China)

Abstract:Considering the standard parameter values of the German standard EN 03 and the domestic comfortable degree analysis, the vibration comfort analysis process of the pedestrian bridge under the action of human load was explained in detail, and the comparison and analysis of a project case were conducted under a variety of working conditions and multiple damping ratios. The following conclusions were drawn that: the increase of damping ratio can effectively reduce vibration acceleration; when the bridge frequency is changed to reduce vibration acceleration, the peak area of the reduction factor ψ should be avoided; for the bridge with higher comfort requirement, TMD setting conditions should be reserved; it is suggested that different comfort analysis conditions should be determined according to the results of bridge pedestrian flow analysis, and the comfortable degree is determined according to the probability of different pedestrian flow conditions during the use of bridges.

Keywords:steel structure; pedestrian bridge; natural frequency; comfortable degree

 

作者简介:来少平,硕士,一级注册结构工程师,Email:shao-ping.lai@arup.com。

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