窄扁拱形组合网架桥的静力特性

Static Behaviors of Narrow Composite Space Truss Flat Arch Bridges

为研究混凝土面板的作用以及混凝土施工对窄扁拱形组合网架桥的影响,比较线性与非线性分析结果之间的差别,对一典型工程进行有限元分析。结果表明,在混凝土面板参与工作前后,线性分析过高地估计了混凝土的作用。混凝土面板参与工作使混凝土面板与网架之间出现相对位移。混凝土面板加强了网架的抗扭转屈曲能力,提高了最小几何非线性屈曲荷载。

To investigate the functionof concrete slabs and the effect of concrete construction on narrow composite space truss flat arch bridges,and to compare the results of linear analysis with the results of nonlinear analysis, finite element analysis of a typical engineering is undertaken. Analysis shows that just before and after the concrete slabs take effects, linear analysis overestimates the stresses of the concrete slabs. When the concrete slabs carry loads relative displacement between the concrete slabs and the steel grids occur. The concrete slabs strengthen the torsion buckling capacity of the steel grids and enhance the minimum geometric nonlinear buckling load.