双层连续箱梁桥开孔箱内壁车辆碰撞仿真研究

Simulation study on oblique collision inner box with opening of the double decked continuous box girder bridge

研究新型上下行分层连续箱梁公路桥,在腹板开孔箱梁内壁由车辆撞击引起结构的动力响应和结构局部损伤破坏机理.通过LS-PrePost前处理器建立不同工况车桥碰撞模型,运用LS-DYNA程序计算分析箱梁在受冲击过程中的应力状态、振动特性和运动轨迹.相对于难于实现的缩尺模型实验和实车碰撞试验,这是一种重要的辅助研究方法.

An important auxiliary method is presented in order to research dynamical response and lo cal destruction mechanism caused by vehicle collision inner box section structure with opening on web which composed a new double decked continuous box girder highway bridge being a broad appli cation prospect. By means of the LS PrePost processor, a collision analysis model of vehicle and bridge is created to simulate a car oblique collision onto web barrier inner box under various cases. Calculated through LS DYNA, stress state, vibration characteristics, as well as the movement track in the collision process are analyzed. This would be an important adjunct research method when it was difficult to achieve in a collision test inner box of scaled model and real vehicle crash test.