公路桥梁非平稳随机激励车桥耦合振动响应研究

项目名称： 公路桥梁非平稳随机激励车桥耦合振动响应研究

项目编号： No.51468018

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 建筑科学

项目作者： 陈水生

作者单位： 华东交通大学

项目金额： 54万元

中文摘要： 影响公路桥梁车桥耦合振动响应的众多因素中，桥面不平顺是一种主要因素。由于模拟桥面不平顺激励方法的多样性及模拟结果的随机性，使得采用确定性振动方法分析不平顺对车桥耦合振动响应具有很大离散性。本课题以路面非平稳随机输入的公路桥梁为研究对象，对公路桥梁车桥耦合随机振动的模型建立、算法分析、模型效验及影响因素展开研究。具体内容包括：建立单轮车桥耦合平稳随机振动模型，开发求解算法；考虑车辆变速及路面谱激励，建立路面随机输入的相干时域模型；将虚拟激励法及路面输入相干时域模型引入公路桥梁车桥耦合振动模型中，建立多点完全相干的公路桥梁车桥耦合随机振动模型；基于实测响应均方根值及方差，效验虚拟激励求解车桥耦合随机振动有效性；分析各因素对公路车桥耦合随机振动响应的影响，基于实测及随机振动模拟结果，回归冲击系数表达式。课题的研究，将为公路桥梁的随机振动开辟新的计算方法，为更加准确研究公路桥梁冲击系数奠定基础。

中文关键词： 桥梁结构；结构分析；车桥耦合振动；随机振动；桥面不平顺

英文摘要： It is well known that bridge roughness irregularity is a main factor which can cause random vibration of vehicle-bridge coupling among many factors which affecting the dynamic response of vehicle-bridge system.Due to varieties of simulate method and randomicity of bridge roughness excitation, there has very evident scattering treated the bridge deck surface irregularity as a time-history sample in order to compute the dynamic responses of vehicle-bridge system. Treated the road bridge as the researched object considering non-stationary road surface random excitation, the project will deal with non-stationary random vibration of vehicle-bridge coupling system such as building model, analysis of algorithm and influencing factor. The main contents contain such aspects as follow. Considering the effects of non-constant speed vehicle and bridge deck roughness, the coherent time domain model of non-stationary road surface excitation are built. A new model of mutiple-point absolute coherent model about road bridge-vehicle coupling vibration system is presented when pseudo excitation method (PEM) and the coherent time domain model of road surface excitation will been introduced. Many factors effecting the dynamic response of vehicle bridge vibration systems will been studied based on probability statistics. Many parametric studies are performed to identify the effects of human perceptibilty curves (graphs of perceptible vibration acceleration versus vibration frequency) based on ride comfort through building the vibration system of vehicle-bridge-person. The results will put forward a new method to analyze the non-station random vibration of road bridge subject to moving loads. At the same time, the results can provide an academic foundation when researching ride comfort.

英文关键词： Bridges Structure;Structure Analysis;Vehicle-Bridge Coupling Vibration;Random Vibration;Bridge Surface Irregularity