移动荷载下钢-混组合梁桥剪力连接件受力分析  

Force analysis of shear connectors of steel-concrete composite bridge under moving load

作　　者：李喜梅[1,2] 王新 母渤海 LI Ximei;WANG Xin;MU Bohai(Western Engineering Research Center of Disaster Mitigation in Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Institute of Earthquake Protection and Disaster Mitigation,Lanzhou University of Technology,Lanzhou 730050,China;China Municipal Engineering Northwest Design&Research Institute Co.,Ltd.,Lanzhou 730050,China)

机构地区：[1]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050 [2]兰州理工大学防震减灾研究所,甘肃兰州730050 [3]中国市政工程西北设计研究院有限公司,甘肃兰州730050

出　　处：《哈尔滨工程大学学报》2023年第6期1051-1059,共9页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51668042,51508257)。

摘　　要：为了分析双工字钢-混组合连续梁桥剪力连接件在移动荷载作用下的受力特性,本文将剪力连接件简化为沿桥梁纵向放置的弹簧单元,用弹簧单元的轴力代替剪力连接件的剪力,采用ANSYS软件建立车桥耦合振动系统,其中车桥之间采用点面接触模型,利用Newmark-β法求解车桥耦合模型,并用现场试验验证了模型的正确性,同时对不同车重、车速、路面不平度和车数下各剪力连接件的受力特性进行了研究。结果表明:采用弹簧单元模拟简化的剪力连接件可以有效的计算桥梁不同位置剪力连接件的受力特性,且不同位置处的剪力连接件受力状态不同,行车因素对剪力连接件受力特性也有较大影响。To investigate the force characteristics of the twin-I steel-concrete composite girder bridge shear connectors under moving loads,the shear connector is simplified to a spring element placed along the bridge′s longitudinal direction,the shear force of the shear connector is replaced with the axial force of the spring element,and the software ANSYS is used to establish the vehicle-bridge coupling vibration system using the point-surface contact model between the vehicle and bridge.The vehicle-bridge coupling model is solved using the Newmark-βmethod.The model has been validated by field test.Simultaneously,the force characteristics of shear connectors are studied under different vehicle weights,speeds,road roughness,and vehicle numbers.The results show that the mechanical characteristics of the shear connectors at different positions of the bridge can be effectively calculated using the spring element to simulate the simplified shear connector.Furthermore,the mechanical states of shear connectors at different positions are different,and the driving factors significantly influence the mechanical characteristics of the shear connector.

关 键 词：桥梁工程 剪力连接件 双工字钢-混组合梁桥 车桥耦合 路面不平顺 行车因素 动力响应 受力特性 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]