环境振动非一致激励对跨线天桥的动力响应影响  

Influences on Dynamic Responses of Cross Line Footbridge Under Non-uniform Environmental Vibration Excitation

作　　者：刘嘉[1] 徐波[2] 瞿伟廉[1] 蒋丽[3] 

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070 [2]武汉理工大学土木工程与建筑学院,武汉430070 [3]湖北经济学院物流与工程管理学院,武汉430205

出　　处：《武汉理工大学学报》2015年第7期57-63,共7页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(51108363);湖北省自然科学基金(2014CFB849)

摘　　要：研究了环境振动对跨线天桥动力响应的影响。根据Reynolds时均化N-S的控制方程对列车风荷载湍流流场进行数值模拟,并结合车辆-轨道耦合动力学模型和轨道-枕木-大地三维有限元传递模型,获得了作用在天桥桥墩处的环境振动波。考虑到环境振动波传递的非一致特性,推导出非一致激励作用下跨线天桥的动力学方程。模拟出列车风和环境振动共同作用下跨线天桥的动力响应,对环境振动对跨线天桥动力响应的影响和跨线天桥的舒适度进行了分析。结果表明,在进行环境振动分析时,必须考虑其非一致激励特性,且环境振动对跨线天桥的振动响应有一定的影响。Influence of the environmental vibration on dynamic responses of cross line footbridge was researched.Firstly,train wind turbulent numerical simulation was carried out according to Reynolds averaged N-S control equations.Then,environmental vibration waves on the piers of footbridge were obtained by establishing the train-rail coupling dynamic model and the rail-sleeper-ground three-dimensional finite element transfer model.Equations of motion for footbridge with non-uniform excitation were derived considering the non-uniform excitation property of environmental vibration waves.Finally,vibration responses of footbridge considering the combined effects of both train wind and environment vibration were simulated.Meanwhile,influences of environment vibration on dynamic responses of cross line footbridge were analyzed and cross line footbridge’s degree of comfort was evaluated.Simulation results show that the non-uniform excitation property of environmental vibration waves must be took into account and the environmental vibration caused by high speed train has some influences on the vibration responses of cross line footbridge.

关 键 词：风荷载 环境振动 跨线天桥 动力响应 非一致激励 

分 类 号：U448.11[建筑科学—桥梁与隧道工程]