【摘要】 近年,超高车辆撞击桥梁上部结构的事故频繁发生,严重威胁桥梁结构安全与城市交通运行。为减小超高车辆撞击桥梁上部结构造成的损失,需要提高桥梁上部结构抗撞能力,然而国内相关研究仍很不足。该文基于精细化非线性有限元和事故案例分析,研究超高车辆撞击桥梁上部结构的损坏机理与撞击荷载。分析结果表明:超高车辆撞击使桥梁上部结构产生整体变形损伤、局部破坏甚至落梁破坏,撞击荷载包括撞击冲量和局部冲击力,不同车型撞击荷载差别较大。更多还原

【Abstract】 Recently,accidents of collisions between over-high trucks and bridge superstructures happen frequently,which seriously threaten the safety of bridges and city traffic system.In order to reduce the loss due to the over-high-truck-to-bridge collision,the collision resistance of bridge superstructures need to be strengthened,on which the research is still very lack currently in China.Based on the high-precision nonlinear finite element simulation and accident investigation,this paper discusses the damage mechanism and collision loads of impact between over-high trucks and bridge superstructures.Study results show that the damage modes of bridge superstructures impacted by over-high trucks include global deformation damage,local damage and girder-falling.The impact loads that controls the damage modes include the collision impulse and the local punching force,which differ a lot for different types of trucks更多还原