既有桥梁车辆荷载模型的研究

Study of Vehicle Load Model for Existing Bridg

基于车辆通过既有桥梁是在人员进行采集荷载信息很早之前就已经发生,认为用平衡更新随机过程可以更好地描述车辆通过既有桥梁的过程。以平衡更新随机过程为数学模型,建立了理想车队。根据理想车队推导出车队影响线面积最大值函数、特定车队单独通过影响线概率分布和特定车队总重分布的表达式,结合数值分析方法得出给定评估期车辆荷载的最大值概率分布。最后通过实例分析了该荷载模型,为既有桥梁车辆荷载模型的研究提供了参考。

Owing to the vehicles passing an existing bridge early before the load information collected by the people, the equilibrium renewal random process is considered able to better describe the process of vehicle passing the existing bridge. Regarding the equilibrium renewal random process as the mathematical model,the ideal vehicle team is set up. Based on the ideal vehicle team, the article deduces the expressions of the maximum value function of influence line area of vehicle team, the probability distribution of influence line of the specified vehicle passing alone and the gross weight distribution of the specified vehicle team. The article gives the maximum value probability distribution of vehicle load in estimation period by the numerical analysis method. Finally, according to the cases, the article analyzes this load model in order to provide the reference for the study of the existing vehicle load model.