文献类型：期刊文献

中文题名：车致桥梁支座动反力频谱特性及影响因素研究

英文题名：Study on spectral characteristics and influence factors of bridge bearing reaction force induced by trains

作者：张志俊 张迅

第一作者：张志俊

机构：[1]贵州理工学院土木工程学院,贵阳550003;[2]西南交通大学土木工程学院,成都610031

第一机构：贵州理工学院土木工程学院

年份：2020

卷号：37

期号：2

起止页码：851-859

中文期刊名：应用力学学报

外文期刊名：Chinese Journal of Applied Mechanics

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：国家自然科学基金(51778534);黔科合基础([2018]1058)。

语种：中文

中文关键词：支座动反力;频域模型;车-线-桥耦合振动;环境振动;频谱分析

外文关键词：bearing reaction force;frequency domain model;train-track-bridge coupled vibration;environmental vibration;frequency spectrum analysis

摘要：建立频域内的车辆-轨道-桥梁垂向耦合动力学模型,包括1/8车辆模型和CRTS-Ⅱ型板式无砟轨道-桥梁-支座模型两部分,以快速求解100Hz以内的桥梁支座动反力。将CRTS-Ⅱ型板式无砟轨道-桥梁-支座模型简化为4层叠合梁,采用Euler梁模拟钢轨、轨道板、底座板和箱梁,采用具有复刚度的弹簧模拟扣件、CA砂浆层、滑动层和桥梁支座。以32m简支桥梁为研究对象,分析了支座动反力的频谱特性,并讨论了轨道不平顺、扣件刚度和支座刚度对支座动反力的影响规律。结果表明:支座动反力在车轮-轨道系统的固有频率附近出现峰值;轨道不平顺幅值在很大程度上决定了支座动反力幅值,其峰值频率点在支座动反力曲线上得以体现;扣件刚度降低可一定程度上减小轮轨力及支座反力峰值、频段幅值及峰值频率;支座刚度降低可以减小支座反力幅值,同时降低峰值频率,其主要通过改变轨道-桥梁耦合系统的频响特性实现,而轮轨力基本不受其影响。
To obtain the bearing force in 1-100 Hz rapidly,the vertical vehicle-track-bridge coupled dynamicsystem is established in the frequency domain,containing two subsystems of 1/8 vehicle model and CRTS-Ⅱslab ballastless track-box girder-bearing model.CRTS-Ⅱslab ballastless track-box girder-bearing subsystem is represented by a 4-layered beam model.Rail,track slab,support plate and box girder are modeled as Euler-Bernoulli beam.Rail fastener,CA mortar layer,sliding layer and bridge bearing are modeled as spring with complex stiffness.A simply-supported box-girder with a span of 32 m is studied to analyze spectral characteristics of bearing force and to discuss influences of track irregularity,fastener stiffness and bearing stiffness on bearing force.Results show that the maximum value of bearing force is found at the natural frequency of wheel-track system.The amplitude of the dynamic wheel-rail force and bearing force can be decided by the amplitude of the track spectrum,to a certain extent.With fasteners stiffness decreasing,the amplitude and frequency of bearing force at the peak frequency band can be decreased partly.With the bearing stiffness decreasing,the bearing reaction force decreases and peak frequency shifts to lower frequency.However,it is not implemented by changing the wheel-rail force,but by changing the dynamic characteristics of track-bridge system.