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车桥耦合系统结构初始变形伪惯性力模型研究

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以往车桥耦合动力分析中不考虑结构初始变形与轨道不平顺两者的差异.研究将高速铁路轨道-桥梁结构初始变形与轨道不平顺分开考虑,提出伪惯性力结构初始变形影响分析新模型,采用经典的Hertz弹簧-质量车辆模型,理论推导了车桥动力方程及轮轨力解析式,以高速铁路简支梁为对象,通过MATLAB自编程序,系统开展了车速及接触刚度影响分析.研究表明:整体上,轮轨力响应较车体加速度、桥梁位移响应对初始变形更敏感,Hertz弹簧刚度对轮轨力的影响要大于车速的影响;将初始变形作为附加轨道不平顺线性叠加模型受Hertz弹簧刚度影响大,伪惯性力模型受车速影响大;线性叠加模型高估了结构初始变形对车桥系统动力响应的影响.该研究可为我国即将到来的高速列车-轨道-桥梁系统大批量运维养护潮,提供更精细准确的模拟方法.
Research on New Model for Influence of Initial Deformation of Bridge Structure in Train-Bridge Coupling System
In the past,the difference between initial deformation of structure and track irregularity was not considered in train-bridge coupling dynamic analysis.In this study,the initial deformation of HSR track-bridge structure and track irregularity are considered separately,and a new model for analyzing the influence of initial deformation of pseudo-inertial force structure is proposed.The classical Hertz spring-mass train model is adopted to theoretically derive the dynamic equation of train-bridge and the analytical formula of wheel-rail force.Taking the HSR simply-supported girder as an object,the influence analysis of train speed and contact stiffness is systematically carried out through MATLAB self-programming.The results show that:On the whole,wheel-rail force response is more sensitive to initial deformation than carbody acceleration and bridge displacement response,and the influence of Hertz spring stiffness on wheel-rail force is greater than that of train speed;the initial deformation as the linear superposition model of additional track irregularity is greatly influenced by Hertz spring stiffness,and the pseudo-inertial force model is greatly influenced by train speed;the linear superposition model overestimates the influence of initial structural deformation on dynamic response of train-bridge system.This study can provide a more precise and accurate simulation method for the upcoming large-scale operation and maintenance of high speed train-track-bridge system in China.

initial deformation of bridgetrain-bridge coupling systempseudo-inertial forceHertz springwheel-rail force

曾旻、刘汉云、杨俊伟、毛娜、蒋君

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中交一航局西南工程有限公司,广西玉林 537000

长沙理工大学土木工程学院,湖南长沙 410114

中铁七局集团有限公司,河南郑州 450016

湖南省交通规划勘察设计院有限公司,湖南长沙 410020

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桥梁初始变形 车桥耦合系统 伪惯性力 Hertz弹簧 轮轨力

国家自然科学基金湖南省领军人才项目湖南省自然科学基金湖南省科技厅优秀青年项目高速铁路建造技术国家工程研究中心开放基金

521084332021RC40312021JJ4058721B0309HSR202004

2024

10.19549/j.issn.1001-683x.2023.09.28.002

中国铁路
中国铁道科学研究院

中国铁路

北大核心
影响因子：0.407
ISSN：1001-683X
年,卷(期)：2024.(3)
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