车辆激励下大跨径桥梁人非系统振动特性  

Vibration analysis of a long-span bridge with a pedestrian and non-motor system caused by vehicle excitation

作　　者：马如进[1] 崔传杰 胡晓红 胡腾 MA Rujin;CUI Chuanjie;HU Xiaohong;HU Teng(College of Civil Engineering,Tongji University,Shanghai 200092,China;Consulting and Supervision Center for Highway Engineering of Hubei Province,Wuhan 430030,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]湖北省公路工程咨询监理中心,武汉430030

出　　处：《振动与冲击》2018年第12期96-101,共6页Journal of Vibration and Shock

基　　金：国家科技支撑计划项目资助(2014BAB16B05);国家自然科学基金项目(51678437)

摘　　要：为研究城市桥梁车致振动引起的下挂人非系统振动响应。基于车桥耦合振动理论,提出了车辆荷载激励下的人非系统的振动响应分析方法,并以某大跨矮塔斜拉桥为例进行了不同车速及路面粗糙度下的最大加速度响应参数敏感性分析,提出了人非系统振动响应的控制措施。研究表明:同一车速和路面粗糙度条件下,人非系统存在明显的局部振动放大效应,其最大加速度响应远大于主梁最大加速度响应,且加速度响应随路面粗糙度的增加而增加,但最大加速度与车速之间不存在明显关系;通过增大挑梁刚度、桥面板刚度和人非系统整体刚度,都能有效控制主跨处人非系统的局部振动,但单独增大桥面板刚度难以起到控制边跨局部振动的作用;进一步通过频域分析发现由中跨到边跨,人非系统的车致振动响应呈现逐渐受高阶振型控制的趋势。In this paper,to figure out the pedestrian and non-motor system vibration caused by vehicle loads in city bridges,a vibration analysis method was established based on the vehicle-bridge-interaction theory. The maximal acceleration responses with different vehicle speeds and road roughness were calculated with an example of a long-span extradosed cable stayed bridge,and some suggestions were given to control the pedestrian and non-motor system local vibration. The study shows that with the same vehicle speed and road roughness,the maximal acceleration of pedestrian and non-motor system was much larger than the main girder,the acceleration responses were increased with road roughness,but it does not have a clear relationship in terms of vehicle speed. By increasing the cantilever stiffness,deck stiffness and the pedestrian and non-motor system ＇s overall stiffness,the local vibration problems of middle span pedestrian and non-motor system were effectively controlled,but increasing deck stiffness does not have a clear effect for side span local vibration. By the frequency-domain analysis,from the middle span to side span,the pedestrian and nonmotor system vibration is gradually controlled by the high-order vibration modes.

关 键 词：人非系统 车桥耦合振动 参数分析 局部振动 频域分析 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]