高桩承台桥受船撞击过程中水流作用分析

Analysis of the Impact of Water Flow for Elevated Pile-cap Bridge Subjected to Vessel Collision

概述了在对高桩承台桥结构受船撞击数值仿真分析过程中考虑水流压力作用效应的必要性,阐述了基于波浪理论并考虑附加水质量计算水流力的简化流固耦合分析方法,同时简要介绍通用桥规及经典水力学理论中关于水流力的计算方法。基于动态非线性有限元技术分别建立无水流作用情况及采用上述三种水流力计算方法的有限元模型,分析比较验证了基于波浪理论并考虑附加水质量计算水流力的简化流固耦合方法的合理性及计算精确性。结果表明,对比通用桥规中计算静水压力及经典水力学计算绕流阻力的方法,按简化流固耦合方法计算的桥墩各部位响应更大,运用该方法对于桥墩防撞设计或结构安全评估将偏于保守和安全。

This study outlines the necessity of considering the effect of the impact of water flow pressure during analyzing the elevated pile-cap bridge subjected to vessel collision,and expresses one concise fluid-structure interaction analysis methods for calculation of the water flow pressure based on Wave Theory and considering added water mass.Meanwhile,this paper briefly introduces the methods in hydraulics as well as General Code for Design of Highway Bridges and Culverts.Based on the dynamical nonlinear finite element technique,models considering the water flow influence which adopts three methods above-mentioned are built separately and compared with no water flow calculated model.Finally,the rationality and accuracy were proved for the concise fluid-structure interaction analysis methods in calculation of the water flow pressure based on Wave Theory with considering added water mass.The results show that,using this concise method will cause more bridge pier response,and it is more conservative and safer for the anti-collision design of the bridge piers or the structure safety evaluation.