车辆碰撞钢筋混凝土桥墩撞击力计算方法研究

Research on computational methods of vehicle impact force on reinforced concrete piers

在试验基础上,探讨了车辆碰撞钢筋混凝土桥墩的撞击力计算方法。应变分析法是根据弹性阶段应变与曲率的关系、曲率与弯矩的关系以及弯矩与外荷载的关系,建立起应变与外荷载的关系,从而根据应变时程求解撞击力时程。动力分析法是将冲击系统简化为双自由度的质量—弹簧体系,忽略桥墩的阻尼作用,建立动力方程,从而求解出撞击力时程。计算结果与试验结果对比表明,本文给出的算法是可行的,具有一定的工程应用价值。

Two computational methods of vehicle impact force on reinforced concrete pier are analyzed based on experimental research.The relation between strain and load in elastic phase is deduced by method of strain analysis based on relationships between strain and curve,curve and moment,moment and load.The time-history of impact force is calculated by the time-history of strain.The impact system of pier is simplified as an equivalent two DOF system in method of dynamic analysis.The dynamic equations are built to calculate the impact responses of structural system by using the D＇ Alembert＇s principle and ignoring the damp action of pier.The calculated results indicate that the methods proposed in paper are feasible compared with test results and the research results have some engineering application values.