用于叠合板的钢筋桁架施工阶段屈曲探析

Buckling Analysis of Lattice Girder for Composite Slabs at Construction Phase

采用非线性有限元分析结合足尺试验的方法,对国内常用钢筋桁架类型进行施工阶段的屈曲分析。通过对12个桁架组合梁模型的计算,探讨国内外常用钢筋桁架受力模式的区别,确定了A型钢筋桁架的屈曲失效模式,及钢筋桁架高度对组合梁的刚度和极限承载力的影响。分析结果用于计算钢筋桁架上弦杆的屈曲长度和计算长度系数μ。

In this paper,the non-linear finite element analysis combined with full scale test was used to perform buckling analysis of commonly used lattice girder types in China at the construction phase.Through the calculation of 12 lattice joists models,the difference between the mechanical behavior of commonly used lattice girders in China and abroad was discussed,the buckling failure mode of type A lattice girder,and the effect of height of lattice girder on the stiffness and ultimate bearing capacity of lattice joists were analyzed.The analytical data were used to calculate the buckling length and calculated length coefficientμof the top-chord of lattice girder.