基于高速列车振动荷载的桩-土-结构相互作用分析  

Pile-soil-structure interaction analysis based on high-speed train vibration load

作　　者：熊辉[1] 谷亚东 XIONG Hui;GU Yadong(College of Civil Engineering, Hunan University, Changsha 410082, China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《铁道科学与工程学报》2019年第2期302-309,共8页Journal of Railway Science and Engineering

基　　金：教育部新世纪优秀人才支持计划资助项目(NCET-13-190)

摘　　要：通过总结高速列车振动荷载相关研究,给出高速列车振动荷载简化表达式。将端承桩看作连续分布水平弹簧-阻尼单元的动力Winkler地基梁模型,建立不考虑轴向力影响的动力平衡微分方程,利用Laplace变换求得动力荷载作用下的水平动力阻抗,通过群桩模型计算结果验证其频率相关性,随着荷载频率变化,水平动力阻抗出现大幅度振荡。建立86 m×142m×86 m 3跨高速铁路刚构桥有限元模型,分析高速列车通过时考虑与不考虑桩土相互作用的桥梁动力响应。对比计算结果,考虑桩-土相互作用的影响,结构将产生更大的位移响应,而上部结构节点力却相应减小;随着列车运行速度变化,桩土相互作用强度也同时发生改变;土层材料参数的变化也将影响桩-土相互作用强度,而且浅层土的影响大于深层土。A simplified expression of high-speed train vibration was loaded by summarizing the relating researches of high-speed train vibration load. The end-bearing pile was considered as a dynamic Winkler foundation beam model continuous distribution of horizontal springs-damping, and build the dynamic equilibrium differential equation without regard to axial force, the Laplace transform was used to obtain the transverse dynamic impedance under the dynamic load and verifying its frequency dependence through the calculation results of group pile model, as the load frequency changes, the horizontal dynamic impedance oscillated greatly. A full-bridge finite model of 86 m×142 m×86 m high-speed railway bridge with three spans was used to analyze dynamic response consider or not consider soil-pile interaction. The comparison results show that the structure have a greater displacement response when soil-pile interaction be considered, but the node force is reduced accordingly, and the strength of pile-soil interaction changes as the train speed varies. The varies of soil material parameters will affect the strength of soil-pile interaction, and the importance of shallow soil is greater than that of deep soil.

关 键 词：高速铁路 列车振动荷载 桩-土相互作用 动力响应 

分 类 号：TU473[建筑科学—结构工程] U24[建筑科学—土工工程]