钢-混凝土组合梁各受力阶段曲率分布研究

在钢-混凝土组合梁全过程分析中，由于栓钉等柔性剪力连接件在受荷较大时会发生塑性变形，从而引起界面上的纵向剪力发生重分布。组合梁的截面曲率在一定程度上受剪力重分布的影响，以均布荷载作用下的简支组合梁为研究对象，将界面受力全过程划分为3个工作阶段，建立了截面轴向力和曲率的计算公式，并将利用上述方法得到的计算结果与按折减刚度法得到的计算结果进行了比较。比较结果表明：在计算组合梁各受力阶段的截面曲率时，需考虑界面纵向剪力重分布的影响。

Research of Curvature Distribution of Steel-concrete Composite Beams at Different Work-stage

For the plastic deformation of flexible connectors such as studs under larger loads, the longitudinal shear force on the interface of steel-concrete composite beams may redistribut along the full-range. The longitudinal shear-force redistribution influences the curvature of composite, beams. Subjected to the simply supported steel-concrete composite beams under uniformly distributed load, the full-range mechanic behavior of the interface was divided into three work-stages. According to each stage, the forraulae for calculating the axial force and the curvature were presented. The curvature obtained from these formulae was compared with that calculated by the reduced rigidity method. The results show that the effect of the longitudinal shear-force redistribution must be taken into account in calculating the curvature of composite beams at different work-stage.