基于非线性有限元的桥梁船撞分析与撞击力研究

Analysis on Vessel Collision with Bridges Based on Nonlinear Finite Element and Study on Impact Force

桥梁船撞通常造成很大的风险,其撞击过程是一个复杂瞬态动力过程,现行规范将这种冲击作用以等效静态力的形式施加到桥梁结构上,计算撞击效应。基于一座内河航道上施工中的桥梁受到船只撞击,计入几何和材料非线性,分析其撞击力和撞击损伤效应。并对比研究不同初速度下的数值分析结果、不同规范的等效静力及其与撞击速度的关系,探讨桥梁船撞作用力。在此基础上,讨论了内河航道船舶等效撞击力,在现有规范下,建议了桥梁设计撞击力的参照公式。

Vessel collision with bridges,which is a complicated transient dynamic process,usually causes a great risk. The crashing action was applied on bridge structures in the form of equivalent static force in current specifications to calculate the impacting force. The impacting force and damage effect of collision was analyzed on the basis that an inland river bridge in construction was subjected to vessel collision,including geometric and material nonlinearity. The numerical analytical results at different initial velocity and the relation between equivalent static force and crashing velocity with different standards were investigated comparatively,and the impacting force of vessel collision with bridges was discussed. Further,the equivalent impacting force of vessel collision with bridges in inland rivers was also explored. The referential formula of impacting force for bridge design was recommended in the current specifications.