冲刷条件下桥梁结构动力性能仿真分析

Simulation analysis of dynamic properties of bridge structure in the condition of scour

水流冲刷造成的桥梁损毁会给人类带来重大的经济损失和人员伤亡。冲刷对桥梁安全性的影响,可以通过分析冲刷条件下桥梁动力性能的变化来进行评价。本文将从冲刷深度和冲刷所造成的桥梁基础截面损失两个方面,分析水流冲刷对桥梁动力性能的影响。在总结已有的模型分析方法的基础之上,提出本文的有限元建模思路。并以密西西比河上被冲毁的33号公路桥为例,通过SAP2000软件建立有限元模型并进行模态分析,得到冲刷条件与桥梁动力性能之间的关系。

Scour has caused huge economic loss and casualties in human history by making bridges failed.The influence of scour on security of bridges may be assessed by analysing the variance of dynamic properties of bridges.This article analyzes the influence of scour on dynamic properties of bridges from two aspects of scour depth and area loss.Based on reviewing existing analytical methods of model,a finite element model is used to analyze the relationship between scour and dynamic properties of an existing failed bridge called MS HWY 33 bridge.