关键词: 车-桥系统, 弯桥动力分析

Abstract: 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.

Key words: bridge-vehicle system, dynamic analysis of horizontally curved bridges