基于板单元形函数的简支T梁桥车桥振动分析  

Analysis of vehicle-bridge coupling vibration for simply supported T beam bridge based on interpolation function of plate element

作　　者：陈代海[1] 李整[1] 马凤瑞 CHEN Daihai;LI Zheng;MA Fengrui(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学土木工程学院,河南郑州450001

出　　处：《铁道科学与工程学报》2018年第7期1754-1761,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51408557);中国博士后科学基金资助项目(2013M541995)

摘　　要：为研究多片式简支T梁桥的车桥耦合振动问题,提出一种基于矩形薄板形函数的公路桥梁车桥耦合振动分析方法。根据分析方法的计算流程,编制汽车-桥梁耦合系统的动力分析程序,并通过算例分析验证其可靠性。在此基础上,针对目前公路简支梁桥上日益严重的超载超速现象,分析不同车速下重载汽车在车队中的位置、数量及间距对简支T梁桥冲击系数的影响规律。研究结果表明:使用基于矩形薄板形函数的公路桥梁车桥耦合振动分析方法得到的车桥动力响应具有较好的精度;重载汽车在车队的位置对桥梁冲击系数影响不大,但其对邻近车辆影响明显;桥上重载汽车数量保持为2辆,其间距在10 m以上,且车速控制在80 km/h以内,对桥梁相对有利。In order to study the problem of vehicle-bridge coupling vibration of multiple simply supported T beam bridges, a method that was based on interpolation function of rectangular thin plate element was proposed to analyze the vehicle-bridge coupling vibration response of highway bridge. According to the computation procedures of the analysis method, the dynamic analysis program of the vehicle-bridge coupling system was compiled, and its feasibility was verified by numerical examples. On this basis, for the phenomenon of overload and speeding on the highway simply supported beam bridges, the influence on impact coefficient of simply supported beam bridge, which was caused by the position in the team, numbers and spacing of heavy cars, was analyzed under different speed. The results show that the dynamic response of vehicle-bridge, which is obtained by the method of vehicle-bridge coupling vibration analysis of highway bridge that based on rectangular thin plate shape function, has better accuracy. The position of heavy car in the team has little influence on impact coefficient of the bridge, but it has significant effects on adjacent vehicles. When it can keep two heavy cars running on the bridge, their spacing is more than ten meters, and the speed is within 80 kilometers per hour, it will be more favorable to the bridge.

关 键 词：多片式简支T梁桥 车桥耦合振动 板单元形函数 重载汽车 冲击系数 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]