汽车超载行驶对简支梁桥振动响应的影响分析  

Analysis of Simply Supposed Girder Bridge Vibration Responses Influenced by Truck Overload Driving

作　　者：赵青[1] 

机构地区：[1]安徽建筑工业学院土木工程学院,安徽合肥230022

出　　处：《河北工业大学学报》2009年第5期114-118,共5页Journal of Hebei University of Technology

摘　　要：针对汽车超载行驶对简支梁桥振动响应的影响,建立了梁桥与行驶的多轴汽车相互作用系统模型.选取了三种不同的汽车荷载进行了数值计算,模拟了不同车速时汽车超载对梁桥的振动响应,得出了梁桥跨中位移的时程曲线,并分析了汽车超载对冲击系数的影响.研究结果表明:汽车超载会加大简支桥梁的振动响应,对桥梁跨中动位移的影响呈线性比例增加趋势,但两者增大的比例不一致,重车超载所产生的效应增大比例较大;对冲击系数的影响与车型的不同和车速变化有关,超载的增加与冲击系数增大的比例不一致,且超载的增加不一定导致冲击系数的增大.Aiming at the simply supposed girder bridge vibration responses influenced by truck overload driving, the model of simply supposed girder bridge and vehicle as an interaction system in which the complex dynamic behaviour of the simply supposed girder bridge is subjected to the dynamic influences of vehicle is established. Three kinds of different load of vehicle are chosen for numerical computing. Authors analyse the simply supposed girder bridge vibration responses under truck overload driving with different speeds, give out dynamic response curves of the displacement between the span and analyse the influence of impact coefficient under truck overload. The results show that the bridge vibration responses can be widend by the truck overload, the influences of the displacement between the span of the simply supposed girder bridge presents the linear increase tendency, yet the proportion of increase is not unanimous, it is greater that the effect of the weighty truck overload; the effect of the impact coefficient have something to do with the difference vehicle and speed, the proportion of the increase of truck overload and the impact coefficient is not unanimous, the increase of overload does not surely cause the greater of the impact coefficient.

关 键 词：桥梁工程 简支梁桥 数值计算 汽车超载 振动响应 冲击系数 

分 类 号：U448.26[建筑科学—桥梁与隧道工程]