行走激励下人行桥振动响应简化计算  

Simplified calculation on the vibration response of a footbridge under human walking loads

作　　者：陈舟 颜全胜[3] 贾布裕[3] 余晓琳[3] CHEN Zhou;YAN Quansheng;JIA Buyu;YU Xiaolin(School of Transportation and Civil Engineering & Architecture, Foshan University, Foshan 528000, China;College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, China;School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China)

机构地区：[1]佛山科学技术学院交通与土木建筑学院,广东佛山528000 [2]三峡大学土木与建筑学院,湖北宜昌443002 [3]华南理工大学土木与交通学院,广东广州510640

出　　处：《哈尔滨工程大学学报》2018年第3期483-489,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金资助项目(51208208);宜昌市科技研究与开发项目(A16-302-a07);佛山科学技术学院博士科研启动基金项目(Gg040930)

摘　　要：为了解决行人引起人行桥的振动响应计算复杂的问题,将行人荷载考虑为确定性模型,推导单个行人过桥时振动响应的解析表达式,给出人致桥梁共振、非共振响应的简化表达式,在动力响应简化表达式的基础上给出了人致桥梁振动放大系数。结合某人行桥结构,对比分析本文的简化公式及放大系数与前人的研究成果。研究表明:运用简化公式可以方便地计算人行桥结构的动力响应,验证了本文方法的精度和正确性。This study aimed at evaluating the complicated calculation problems related to the vibration response of footbridge caused by the pedestrians.The pedestrain load is considered as the deterministic model.In addition,the analytical expression of vibration response caused by the individual pedestrians crossing the footbridge was deduced,and a simplified expression on the pedestrian-caused footbridge resonance and off-resonance response were provided.Based on these expressions,the amplification coefficient of pedestrian-caused footbridge vibration was determined.Taking a footbridge structure as an example,the simplified formula and amplification coefficient were compared with those deduced in the previous studies.Thus,the dynamic response of footbridge structure can be easily calculated using the simplified formula,thereby verifying the accuracy and correctness of the proposed method.

关 键 词：人行桥 行走激励 解析解 频率响应函数 简化计算 放大系数 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] U448.11[交通运输工程—道路与铁道工程]