斜吊杆下承式系杆拱人行天桥振动设计  

Vibration Design of Inclined Suspender Through Bowstring Arch Footbridge

作　　者：马中文 刘峰 汪剑 Ma Zhongwen;Liu Feng;Wang Jian

机构地区：[1]武汉市政工程设计研究院有限责任公司,湖北武汉430015

出　　处：《城市道桥与防洪》2019年第2期97-99,124,M0011,共5页Urban Roads Bridges & Flood Control

摘　　要：某斜吊杆下承式系杆拱人行天桥,结构较为新颖,但其整体刚度较小,自振频率低,不能满足现行规范舒适度设计要求。为此根据该天桥的特点确定合理的单人及高密度人群荷载模式,对天桥在人行荷载下的振动反应进行研究分析,并通过优化TMD系统设计参数确定了TMD减振方案。其结果表明,该天桥在不增加结构截面尺寸的前提下,通过设置TMD系统减振,其最大加速度响应减小了26%,能够满足国外相关规范舒适度设计要求。人行天桥振动响应计算过程可为同类型人行天桥振动设计提供参考。The structure of an inclined suspender through bowstring arch footbridge is relatively new, but its integral rigidity is relatively smaller and its natural vibration frequency is low, which cannot meet the comfort design requirements of the current specification. Therefore, based on the characteristics of this footbridge, the reasonable single and high density crowd load mode is determined to study and analyze the vibration reaction of footbridge under the pedestrian load. And the TMD vibration reduction scheme is determined by optimizing the design parameters of TMD system. The result shows that the maximum acceleration response of this footbridge is reduced by 26% through setting up the TMD vibration reduction system under the premise of not increasing the section dimensions of the structure, and it can meet the comfort design requirement of the relative specifications abroad. The vibration response calculation process of footbridge can be referred for the vibration design of the similar footbridges.

关 键 词：人行天桥 振动设计 TMD 

分 类 号：U448.11[建筑科学—桥梁与隧道工程]