【摘要】 一座长50m宽4.5m的扁拱形人行桥采用了由双层网架和混凝土面板组成的组合网架结构.在施工过程中安装完的网架作为混凝土面板的施工支架使用.为研究混凝土面板和施工对屈曲荷载的影响,利用AN SY S的单元生死功能对结构进行了非线性对比计算.分析表明,混凝土面板施工对最小几何非线性屈曲荷载系数λ影响不明显.混凝土面板可以明显加强网架的抗扭转屈曲能力,对λ影响较大.更多还原

【Abstract】 The structure of a flat arch pedestrian bridge with 50m long and 4.5m wide uses a kind of composite space structure consisting of double-layer steel grids and reinforced concrete slab.After the assembly of the steel grids,it serves as the scaffold for the construction of concrete slabs.To investigate the effect of concrete slabs and construction on the stability of the structure,geometrically nonlinear finite element analysis is carried out using the function of element birth and death of ANSYS.Analysis shows that the effect of construction of concrete slabs on the minimum geometric nonlinear buckling load coefficient λ is not significant.The concrete slabs strengthen the torsional buckling capacity of the steel grids,and have an outstanding impact on λ.更多还原