汽车对桥梁冲击作用分析

ANALYSIS OF IMPACT EFFECTS OF MOVING VEHICLES ON A CONTINUOUS BRIDGE

为了分析汽车桥梁系统参数变化对动力放大系数的影响规律,将桥梁等效为等长的欧拉梁单元,将汽车等效为两自由度五参数模型,在状态空间求解车桥耦合振动方程得到系统的动力响应,定义了由垂向挠度和弯矩表示的动力放大系数。在数值模拟中研究了桥上路面不平顺、桥梁损伤、汽车参数和汽车速度对冲击系数的影响。

To study effects of parameters of a vehicle-bridge system on dynamic magnification factor,a simply supported bridge is modeled an Euler beam with equal length,and a moving vehicle is modeled a two-degree-of-freedom system with five parameters.The dynamic responses of the combined system can be obtained by solving the vehicle-bridge coupled vibration equations.The dynamic magnification factor for displacement and bending moment are defined.Effects of road-surface roughness,bridge damage,vehicle parameters and vehicle speed on the impact are studied with numerical simulations.