Abstract: In order to solve the technique problem of ship collision prevention on “weak pier resisting strong collision” of weak type of cylindrical pier in bridge engineering, according to ship collision force characteristics of the weak type of cylindrical pier and “all-rounded flexible anti-collision” defects of existing anti-collision structures for cylindrical pier, a new type of attached flexible anti-collision structure of steel enclosure-steel spring sleeve box for cylindrical pier was developed and designed by adopting problem solving-method of improving “all-rounded flexible anti-collision” capacity of the anti-collision structure by its structure form innovation. On this basis, according to the structural form and functional analysis of the new anti-collision structure, the flexible anti-collision principle of the new anti-collision structure was derived. The flexible anti-collision effect of the new anti-collision structure was determined according to the results inspected by the application of the new anti-collision structure in actual bridge engineering, such as the reduction of bridge pier ship collision force, the reduction of ship collision damage and improvement of safety under accidental conditions of bridge pier ship collision. The research results show that the new anti-collision structure, relying on its “impact flexibility” structure form, has a far better flexible anti-collision effect than the conventional steel sleeve box anti-collision structure does, which can greatly reduce pier ship collision force and ship collision damage, and can significantly improve the safety of pier at ultimate limit state under ship collision action accidental condition.

Key words: bridge engineering; cylindrical pier; flexible anti-collision structure; steel enclosure-steel spring sleeve box; flexible anti-collision principle; flexible anti-collision effect; weak pier resisting strong collision

摘要： 为解决桥梁工程中薄弱型圆柱式桥墩“弱墩抗强撞”的防船撞技术难题，根据薄弱型圆柱式桥墩的船撞受力特点及现有圆柱式桥墩防撞结构的“全方位柔性防撞”缺陷，采用以防撞结构的结构形式创新提升其“全方位柔性防撞”能力的难题解决方法，研发设计出一种新型圆柱式桥墩附着式钢围-钢弹簧套箱柔性防撞结构；在此基础上，根据新防撞结构的结构形式和功能分析，导出了新防撞结构的柔性防撞原理；根据新防撞结构实桥工程应用检验的桥墩船撞力降低、船舶撞损破坏减少和桥墩船撞作用偶然状况安全性改善结果，确定了新防撞结构的柔性防撞效果。研究结果表明，新防撞结构依靠其“冲击柔性”结构形式，具有远优于常规钢套箱防撞结构的柔性防撞效果，能大幅降低桥墩船撞力和船舶撞损破坏，能显著改善桥墩船撞作用偶然状况的承载能力极限状态安全性。

关键词: 桥梁工程; 圆柱式桥墩; 柔性防撞结构; 钢围-钢弹簧套箱; 柔性防撞原理; 柔性防撞效果; 弱墩抗强撞