Abstract: The form of impact contact surface has influence on the dynamic response of barge-bridge pier collision. Based on the FEM, the impact force and crush depth rule caused by barge-pier collision with plane contact surface and arc contact surface were researched. Furthermore, the mechanical mechanism of the difference of collision response was discussed, and dynamic responses of pier structures in different contact conditions were analyzed. Finally, the equivalent impact force available for pier design was proposed according to the equivalent principle of maximum dynamic response of pier under barge impact. The results show that the process of barge-bridge pier collision observably presents two stages: instantaneous elastic impact stage and later inelastic impact stage. The size and shape of the impact contact surface have significant influence on the elastic and inelastic collision responses of the pier collided by barge. The maximum impact force may not be taken as the basis for pier design directly, but the equivalent impact force can serve as a reference for design of pier.

Key words: bridge engineering, ship-bridge collision, barge, contact surface, impact force, crush depth

摘要： 碰撞接触面形式对驳船撞击桥墩的动力响应存在影响。利用有限元分析方法，研究了驳船与桥墩分别以平面接触和弧面接触碰撞时的撞击力及撞深规律，讨论了碰撞响应差异的力学机理，分析了不同接触形式下桥墩结构的碰撞动力响应；根据驳船撞击作用下桥墩的最大动力响应等效原则，提出了可供桥墩设计所用的等效撞击力。结果表明：驳船撞击桥墩时呈现明显的瞬时弹性碰撞和后期非弹性碰撞2个阶段，碰撞接触面尺寸和形状对驳船撞击桥墩的弹性和非弹性碰撞响应均存在显著影响，最大撞击力不一定能直接作为桥墩的设计依据，而等效撞击力可以作为桥墩的设计参考值。

关键词: 桥梁工程, 船桥碰撞, 驳船, 接触面, 撞击力, 撞深