高架轨道交通引起地面振动有限元分析  

The Finite Element Analysis of Ground Vibration Caused by Rail Traffic on Viaduct

作　　者：宋福春[1] 张军[1] 李宁[2] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]沈阳市房地产开发建设管理办公室,辽宁沈阳110013

出　　处：《沈阳建筑大学学报（自然科学版）》2012年第4期612-618,共7页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51078242);辽宁省教育厅重点实验室项目(LS201036);沈阳建筑大学省级重点实验室开放基金项目(YT-200902)

摘　　要：目的研究高架结构下轨道交通引起的振动在成层土的传播规律,为高架结构周围环境减振降噪提供解决方法.方法考虑轮轨间的竖向不平顺,建立列车-高架桥梁-多层土体三维有限元模型,对不同车速下的三维空间有限元模型进行瞬态分析,分析了土体的振动,得到距振源不同距离的地表振动和振动在成层土的传播规律.结果高架结构对列车引起的振动有很好的衰减作用,桥墩墩底的竖向振动加速度是跨中的1/100左右.与二维模型相比,三维有限元模型中振动的计算结果较小,更接近实际状况.墩底与主梁跨中相比,竖向加速度可以衰减103倍左右,桥墩底部地表最大加速度是23 m处的97倍.结论振动在高架结构中衰减非常大,在该地区土质条件下,在距离高架结构10 m的区域,振动衰减到非常低的水平,不需要减隔振就能够满足国家规范要求.The research obtained the vibration propagation law caused by viaduct rail traffic in layered soil, and provided the basis for ambient noise and vibration reduction. Consider the vertical irregularities between the wheel and rail,a train-viaduct-multilayer soil 3D finite element（ FE）model in different speed was estab- lished, and get the vibration of different distance from the source and the vibration propagation law in layered soil, the vibration can be got by transient analysis. The viaduct have a good attenuation function for vibration caused by train,the vertical vibration acceleration of the end of the pier node is about 1/100 of the midspan node. Compared with 2D model, the vibration acceleration of the calculation results of 3D FE model are smaller, and more close to the actual situation. The vertical acceleration of pier bottom can attenuation 103 times than midspan. The maximum acceleration of piers bottom is 97 times than 23m area. So the attenuation of vibration in viaduct is very large. In this area of soil condition,the vibration decays can reach to a very low level at a distance less than lOm area, so the area without vibration isolation can meet the national stand- ard requirement.

关 键 词：地面振动 有限元分析 高架 轨道交通 

分 类 号：TU441.3[建筑科学—岩土工程]