泊松比对钢管混凝土拱桥极限承载力的影响

主要研究在几何和材料双非线性影响下,分析大跨度钢管混凝土拱桥钢管内混凝土泊松比变化对桥梁极限承载力的影响.。以某桥为背景,利用ansys程序进行三维有限元仿真分析,在考虑混凝土泊松比变化情况下,逐步改变核心混凝土泊松比直至结构破坏,并与不考虑混凝土泊松比变化的情况相比较,以考察核心混凝土泊松比变化对桥梁极限承载力影响程度,得出在对拱桥的极限承载力分析时,考虑钢管对核心混凝土的套箍作用,可使极限承载力比不考虑混凝土泊松比变化时的计算值高出10%。

Impacts of Poisson Ratio on Ultimate Bearing Capacity of Concrete Filled Steel Tubular Arch Bridge

Considering the geometrical physical nonlinearities simultaneously,the impacts of poisson ratio of core concrete on the ultimate bearing capacity of a large-spaned concrete filled steel tubular arch bridge are analyzed.A 3D-simulation for a pedestrian overcrocs,bridge shows the evolutiion with the variable concrete poisson ratio up to the structural failure.Comparatively,the bearing capacity analysis considering the variable concrete poisson ratio enables to enhance the design capacity by 10%.