桥梁固定式防撞钢套箱能力曲线的解析计算方法

基于船-船碰撞解析研究，分析了钢套箱竖向外板、横肋、竖桁等构件的变形机理与破坏模式，讨论了钢套箱在不同撞击位置下的撞击力差异. 结果表明：由于钢套箱与船舶舷侧结构的尺寸差异，其横竖桁排布密、间距小，使得撞击点处相邻构件能够很快参与受力，不同撞击位置下的撞击力差异并不显著. 结合不同外形船艏撞击下的钢套箱受力情形，建立了典型的碰撞场景模型，提出了同时适用于带球艏船舶、楔形艏船舶撞击下的钢套箱抗撞性能的解析计算方法. 采用提出的解析计算方法，计算了固定式钢套箱在不同外形船舶撞击下的撞击力-撞深曲线，通过与精细有限元分析结果对比表明：解析计算方法的结果与精细有限元分析结果较好地吻合，证明了解析方法的有效性.

Analytical Method for Estimating Anti-collision Capacity Curve of Fix-typed Steel Fenders of Bridge Structures

In this context, based on the analytical methodology of the ship-ship collision, the deformation mechanisms and failure modes of structural members in steel fenders (e.g., outer plate, transverse, and vertical ribs) were investigated. The characteristics of impact forces under different impact locations were carefully discussed. The analysis results indicate that the adjacent members at the impact location could work cooperatively at the same time because of the close arrangement and the small space inside the steel fender, and the differences of impact forces under various impact positions would be not significant. Based on the resistance characteristics of steel fenders under difference bow shapes, the typical collision scenarios were defined. Accordingly, the analytical method was developed to estimate the anti-collision performance of steel fenders, which is suitable for both ship vessels with a bulbous bow and those with a raked bow. The impact force versus crush depth curves of the fixed-type steel fenders were obtained by using the proposed analytical method for different ship impacts. The analytical results were compared with those obtained from the finite element analysis. The results show that the analytical results are in good agreement with the finite element results, indicating the rationality of the analytical method developed in this study.