柔性人行天桥舒适度的评价分析

Comfort evaluation and analysis of flexible pedestrian overpass

近年来,人行天桥数量增长较多,造型优美且跨度也越来越大.但是,这种类型的桥梁基频很多都在3 Hz以内,不满足国内相关规范要求.因此,采用通用有限元(ANSYS)软件建立厦门市白城人行天桥有限元模型,结合德国EN03规范建立竖向一阶振动行人荷载模型,将行人荷载模型按照TC1~TC5交通级别加载至有限元模型中计算人行天桥的动力响应,根据计算结果对该人行天桥舒适度进行评价.结果表明人行天桥基频小于3 Hz时桥梁舒适度也能满足要求,国内相关规范的要求较为保守,并给出为保证行人舒适度应在人行天桥日常使用中将行人数量控制在266人以下的建议.

In recent years,the number of pedestrian overpasses has increased greatly.Among these overpass,many are constructed graceful in shape with increasingly larger spans.However,there less-than-3-Hz frenquencies violate requirenments of relevant domestic codes.Therefore,the finite element model of Xiamen Baicheng pedestrian overpass is established by ANSYS software,and the vertical first-order vibration pedestrian load model is established by German EN03 standard.The pedestrian load model is loaded into the finite element model according to TC1-TC5 traffic level to compute the dynamic response of the pedestrian overpass,and the comfort degree of this pedestrian pverpass is evaluated according to these computational results.The study shows that the pedestrian overpass comfort can also meet the requirements when the basic frequency of pedestrian over pass less than 3 Hz,and requirements of relevant domestic codes are conservative.It suggests that the pedestrian number should be controlled below 266 in order to ensure the pedestrian comfort in the daily use of the bridge.