摘要
为探寻路桥过渡段桥台与引道之间容许差异沉降的理论确定方法 ,车辆采用两自由度体系模型 ,路桥过渡段采用不设搭板的台阶模型 ,行进方向取下桥向 ,认为车辆通过路桥过渡段作自由振动 ,给出了车辆振动方程和初始条件 ,分别用振型叠加法和拉普拉斯变换法进行了车路动力学分析 ,求出了人的竖向加速度和路面对车辆的作用力。 2种方法计算结果非常吻合 ,表明当车辆模型和路桥过渡段模型较复杂时 ,路桥过渡段车路动力学分析可以采用拉普拉斯变换法 ,其中拉氏数值逆变换采用Crump法 。
To find the method to determine the tolerable differential settlement at the end of bridge in theory, simplifying the vehicle as two degree freedom system and the end of bridge without approach slab as a step, taking into account the way of leaving bridge, regarding the vehicles' vibration caused by passing the step as free vibration with some initial conditions, the author gave the vibration equations of vehicle and the initial condition, and analyzed the dynamic vehicle roadway interaction with mode superposition method and Laplace transform method, and man's vertical acceleration and the force on the vehicle by the pavement were got. The results gained from the two methods above conformed very well, which indicated that, when the models for the vehicle and the end of the bridge were complex, Laplace transform method could be used to the dynamic response analysis on the vehicle roadway interaction, and Laplace transform's numerical inversion was developed by Crump and the calculating program was edited with MATLAB.
出处
《中南公路工程》
2005年第1期1-4,共4页
Central South Highway Engineering
