风-浪联合作用下斜拉-悬索协作体系桥车-桥耦合振动仿真研究  

Simulation of Train-Bridge Coupling Vibrations in a Hybrid Cable-Stayed Suspension System under Combined Wind and Wave Actions

作　　者：祝兵[1] 员帅伟 王浩宇 殷瑞涛 ZHU Bing;YUAN Shuaiwei;WANG Haoyu;YIN Ruitao(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《桥梁建设》2024年第6期23-31,共9页Bridge Construction

基　　金：国家自然科学基金项目(52278221,U1834207)。

摘　　要：为保证海洋环境下斜拉-悬索协作体系桥列车运行的安全性和舒适度,对该类桥梁进行风-浪联合作用下的车-桥耦合振动仿真研究。以某公铁两用斜拉-悬索协作体系桥为背景,采用ANSYS软件建立桥梁有限元模型,采用多体系统动力学软件SIMPACK建立列车动力学模型,利用重叠网格技术,模拟车-桥耦合系统在不同风速和车速下的气动荷载,采用FLOW-3D软件计算桥梁下部复合基础的规则波浪荷载,建立风-浪联合作用下的车-桥耦合振动模型,分析波高、风速和车速对车-桥耦合系统动力响应的影响规律。结果表明:在风-浪-车-桥耦合系统中,列车各动力学指标均随波高增大而增大,桥梁跨中横向位移随波高增大而显著增大,而跨中竖向位移几乎不受影响;列车各动力学指标均随风速提高而显著增大,桥梁跨中竖向位移随风速提高而减小;列车各动力学指标均随车速增大而增大,桥梁跨中横向位移和横向加速度不随车速改变而显著变化,桥梁竖向位移和竖向加速度随车速提高而显著增大。This paper presents the numerical simulation research of the train-bridge coupling vibrations in the offshore hybrid cable-stayed suspension bridge under the combined wind and wave actions.A finite element model of a rail-cum-road bridge of a hybrid cable-stayed suspension system was established in ANSYS,and a dynamic model of CRH3 train was developed in SIMPACK,to simulate the aerodynamic loads of the train-bridge coupling system at different wind and train speeds.Based on the regular wave loads on the composite foundations of the bridge calculated by FLOW-3D,a wind-wave-train coupling model was built up,to analyze the influence of wave heights,wind and train speeds on the train-bridge interactions.The results show that in the wind-wave-train-bridge coupling system,the dynamic property indicators of the train increase as the wave heights become bigger.As the wind speed increases,the midspan transverse displacements of the bridge get bigger,while the vertical displacements have almost no change.The dynamic property indicators of the train are in positive proportion to the train speeds,while the midspan transverse displacements and acceleration do not pace with the variation of train speed,the vertical displacements and acceleration significantly increase along with the increase of train speed.

关 键 词：斜拉-悬索协作体系桥 公路铁路两用桥 跨海桥梁 风-浪联合作用 车-桥耦合振动 重叠网格技术 气动荷载 有限元法 

分 类 号：U448.121[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]