车桥系统空间非平稳随机分析  

Spatial Train-bridge Coupling System Non-stationary Stochastic Responses Analysis

作　　者：李小珍[1] 朱艳[1] 强士中[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《铁道学报》2012年第6期88-94,共7页Journal of the China Railway Society

基　　金：国家自然科学基金(50678150;51008250);新世纪优秀人才支持计划(NCET-10-0701);国家863计划(2011AA11A103);高等学校博士学科点专项科研基金(20110184110020);四川省杰出青年学术技术带头人计划(2010JQ0018);四川省应用基础研究(2010JY0026);中央高校基本科研业务费专项资金(SWJ-TU12CX062)

摘　　要：采用虚拟激励法将轨道高低、方向和左右轨高差不平顺转化为一系列简谐荷载,将非平稳振动分析转化为确定性的时间历程分析,进行三维车桥系统空间非平稳随机分析。采用分离迭代法求解车桥系统运动方程,运用三倍差原理确定系统响应的最大和最小值,讨论系统响应的功率谱密度。研究表明:车体振动、桥梁跨中横向响应和轮对受到的横向轮轨力的随机性较大,轨道不平顺是其主要影响因素,桥梁跨中垂向响应及轮对受到的垂向轮轨力主要由确定性荷载引起。The pseudo-excitation method （PEM） was applied in the spatial train-bridge coupling system non-sta tionary stochastic responses analysis. Track vertical profile irregularity, track alignment irregularity and track height difference irregularity of left and right rails were transformed into the superposition of a series of deter- ministic pseudo harmonic surface unevenness and non-stationary random vibration analysis was translated into deterministic time-history analysis. Separate iteration was applied in solving the coupling system equation. The maximum and minimum system responses were obtained on the basis of the 3o principle. PSD of the system re- sponses were discussed. The results show as follows.. Responses of the train body, lateral responses of the bridge and lateral wheel-rail forces have large randomness,and track irregularities are the primary influence fac- tors;bridge vertical responses and vertical wheel-rail forces are caused by deterministic loads.

关 键 词：桥梁工程 随机响应 功率谱密度 虚拟激励法 车桥系统 轨道不平顺 

分 类 号：U441[建筑科学—桥梁与隧道工程]