大跨铝合金天桥人群荷载动力响应研究  

Study on Crowd Load Dynamic Response of Long-span Aluminum Alloy Flyover

作　　者：韦树军 张潭潭 徐其功 吴子儒 罗沐鑫 WEI Shujun;ZHANG Tantan;XU Qigong;WU Ziru;LUO Muxin(Jianke Architectural Design Institute of Guangdong Province Co.,Ltd.Guangzhou 510010,China)

机构地区：[1]广东省建科建筑设计院有限公司,广州510010

出　　处：《广东土木与建筑》2025年第1期101-104,共4页Guangdong Architecture Civil Engineering

摘　　要：为了研究多工况人群荷载作用下大跨铝合金天桥动力响应问题,以某大跨度铝合金天桥为例,基于傅里叶级数的人行荷载模型,采用MIDAS CIVIL进行理论计算分析。选取了5种人群荷载工况通过天桥时结构动力响应,目标分别为天桥第一跨跨中和第二跨跨中,并分析了天桥舒适度。结果表明:行人行走频率趋于天桥第一阶竖向基频时,天桥的动力响应最大。人群双向行走时的动力响应要小于单向行走,且不同工况下天桥动力响应时程结果差距较大,建议天桥设计时应全面考虑不同工况,保证天桥结构满足要求的同时,避免共振问题,提高天桥行走舒适性。In order to study the dynamic response of long-span aluminum alloy bridge under multi-load,taking a long-span aluminum alloy bridge as an example,based on the pedestrian load model of Fourier series,MIDAS CIVIL is used for theoretical calculation and analysis.The structural dynamic response of five kinds of crowd load cases passing through the flyover is selected,and the goals are the middle of the first span and the second span of the flyover,and the comfort of the flyover is analyzed.The results show that when the pedestrian walking frequency tends to the first vertical fundamental frequency of the overpass,the dynamic response of the overpass is the largest.The dynamic response of the crowd walking in two-way is less than that in one-way walking,and there is a big difference in the dynamic response time history of the overpass under different working conditions.It is suggested that different working conditions should be comprehensively considered in the design of the flyover to ensure that the structure of the flyover meets the requirements and avoid the resonance problem at the same time.Improve the walking comfort of the overpass.

关 键 词：大跨度铝合金天桥 动力特性 动力响应 人群荷载 舒适度 

分 类 号：U442.52[建筑科学—桥梁与隧道工程]