湖南大学学报（自然科学版）2018，Vol.45Issue(1)：9-18,10.DOI:10.16339/j.cnki.hdxbzkb.2018.01.002
基于精细有限元法的车致大跨度斜拉桥整体及局部振动研究
Research on Global and Local Vibration of Long-span Cable-stayed Bridge Induced by Passing Train Based on Fine Finite Elem ent Method
摘要
Abstract
To investigate the global and local dynamic response of plate-truss composite structure(i.e.,cable-stayed bridge induced by train-bridge coupling vibration),a numerical approach was presented based on train-bridge coupled dynamics.A coupled train-bridge system model composed of a 3D vehicle model with 31 degrees of freedom,a 3D fine bridge model established by the direct stiffness method,and an as-sumed wheel-rail spatial contact relationship based on the Hertz nonlinear contact model and nonlinear creep force model were developed.The self-developed software TRBF-DYNA was applied to analyze the dynamic responses,such as acceleration,displacements and stresses.The Dongting Lake three tower cable-stayed bridge with a main span of 406 m in Jingyue railway line was taken as an example.The global and local dynamic response of the bridge,variations of running safety,and ride comfort index were discussed under different routes,speeds and track irregularities conditions.The results show that the local dynamic response of orthotropic steel bridge deck is much larger than the response of steel truss girder.Dynamic coefficient of large-span cable-stayed bridge is small,and the influence of the speeds and track irregularity on dynamic coefficient of large-span cable-stayed bridge is insignificant.The lower chord and web members of steel truss girder are in high cycle fatigue stress state,which should be paid more attention in the study of their fatigue properties.Further,the dynamic response of bridge,running safety indexes and ride comfort index satisfy the code requirements under the designed running speed.关键词
车-桥耦合振动/铁路斜拉桥/有限单元法/轮轨接触/动力响应Key words
train-bridge coupled vibration/railway cable-stayed bridge/finite element method/wheel-rail contact/dynamic response分类
建筑与水利引用本文复制引用
朱志辉,徐智伟,程玉莹,王力东,蔡成标..基于精细有限元法的车致大跨度斜拉桥整体及局部振动研究[J].湖南大学学报（自然科学版）,2018,45(1):9-18,10.基金项目
国家重点研发计划项目(2017YFB1201204),National Key R&D Project(2017YFB1201204) （2017YFB1201204）
国家自然科学基金资助项目(51378511,51678576),National Natural Science Foundation of China(51378511,51678576) （51378511,51678576）
牵引动力国家重点实验室开放课题资助项目(TPL1601),Open Project Foundation of State Key Laboratory of Traction Power(TPL1601) （TPL1601）
