连续弯梁桥车-桥系统动力分析  

Dynamic Analysis of Bridge-Vehicle System of Continuous Horizontally Curved Bridge

作　　者：单成林[1] 王向坚[1] 

机构地区：[1]重庆交通学院结构工程系

出　　处：《重庆交通学院学报》1991年第2期10-18,共9页Journal of Chongqing Jiaotong University

摘　　要：本文提出连续弯梁桥在车辆动荷载作用下的耦合振动分析方法。将弯梁桥离散成多自由度体系,采用水平曲梁单元及集中质量,计入瑞雷粘性阻尼的影响。车辆力学模型采用双轴分段双线性弹簧-质量的二自由度体系。应用数值方法,分析车辆振动荷载作用下的桥梁动力响应。探讨了车辆行驶速度、桥梁弯道半径、刚度比、桥面不平及频率比对桥梁挠度及弯矩动态增量的影响。编写了计算机程序(Fortran)。数值计算结果与简支曲梁无限自由度解的结果相吻合。This paper presents a method to aralyzc the coupled vibrfticn of the bridge-vehicle system of continvous horizontaily curved bridges under the action of moving vehicles.The horizontally curved bridge is considered a multidegree-of-freedom system, using the element of horizontally curved beam and lumped-mass and taking into acecurt the effect of Rayleigh viscous-damping.The vehicle is modelled by two-deg ree-of-freedcm sprirg-mass system of twe-axle springing load, and the load- deformation relationship is represented by a bilinear diagram. This dynamic response of continuous horizontally curved bridges under the action of moving vehicles is studied with the method of numerical analysis.The effect of some varying parameters on the dynamic increment of deflection and moment of horizontally curved bridges is investigated.These parameters are vehicle speed,curvature radius,rigidity ratio,road surface roughness and frequency ratio.A computer program in Fortran has been written.The results of numerical computations conincide with those of single-span horizontally curved bridges of infinite degrees of freedom.

关 键 词：车桥系统 动力分析 连续弯梁桥 振动研究 公路桥 

分 类 号：U448.140.1[建筑科学—桥梁与隧道工程]