摘要
为了准确预测高架桥轨道交通引起的环境振动,该文运用列车-轨道-桥梁耦合动力学理论及有限元建模的方法,建立了高架桥轨道交通引起的环境振动理论分析模型,模型包括振源和传播路径两大部分。振源模型由列车、轨道和桥梁组成,其中列车模型被模拟为带有多个车厢的体系,而每个车厢又是由弹簧-阻尼器连接车体、转向架和车轮所组成的多自由度体系,轨道模型采用Euler-Bernoulli梁模型,桥梁模型则为带弹簧支座的简支梁模型。三维的传播路径模型包括桥墩、基础结构和场地土,此部分模型由大型通用有限元程序Ansys建立。建立的高架桥轨道交通引起的环境振动理论分析模型较系统地反应了振动由产生到传播的整个过程,计算结果与北京地铁5号线的实测结果比较吻合。
A theoretic model for environmental vibrations induced by trains on viaducts is developed in this paper by means of train-track-bridge coupling dynamic theory and finite element methods. The model mainly consists of two parts： the source model and the path model. The source model is made up of a train, the rail and bridge. The train model is a multi-freedom system with car bodies, bogies and wheels connected by spring-dampers. The rail is modeled as Euler-Bernoulli beam, and the bridge is modeled as simplely supported beam with a spring fastening. The path model is established by finite element method software. The theoretic model presented can systematically describe the production and propagation of environmental vibrations induced by trains on the viaduct. The calculated results show a good agreement with the measured results collected on the Beijing No.5 Metro Line in July, 2007.
出处
《工程力学》
EI
CSCD
北大核心
2009年第10期117-122,共6页
Engineering Mechanics
基金
国家自然科学基金重点项目(50538010)
北京市自然科学基金项目(8082021)
比利时-中国政府间科技合作项目(BIL07/07)
关键词
高架桥
城市轨道交通
环境振动
产生机理
试验
预测
viaduct
urban rail traffic
environmental vibrations
mechanism of production
experiment
prediction
