【摘要】 为了在有关组合梁界面滑移及挠度变形的研究中考虑纵向剪力重分布的影响,本文以受均布荷载作用的简支组合梁为对象,研究栓钉等柔性连接件塑性变形引起的纵向剪力重分布。根据连接件的受力状态,将界面受力全过程划分为3个工作阶段,建立相应阶段的纵向剪力简化计算模型,推导轴向力和截面曲率方程,进而得到组合梁界面滑移及挠度变形的计算公式,并将本文计算结果与按我国钢结构设计规范建议的折减刚度法得到的计算结果进行比较。比较结果表明,在分析组合梁各受力阶段的界面滑移及挠度时,需考虑界面纵向剪力重分布的影响。更多还原

【Abstract】 The effect of the redistribution of longitudinal shear forces is neglected in most studies on calculating slip and deflection of composite beams.By taking a simply supported composite beam under uniformly distributed loads as an example,the redistribution of longitudinal shear forces induced by plastic deformation of flexible connectors such as studs is investigated.Based on the actual working conditions of the connectors,the whole mechanical process of the interface of the steel-concrete composite beam is divided into three working-stages.Simplified analytical models of longitudinal shear forces are established for all stages and corresponding formulae for calculating axial forces and section curvatures are derived.The formulae for calculating slip and deflection of composite beams are then presented.The predicted results are compared with those calculated by the reduced rigidity method suggested in the Code of Steel Structures of P.R.China.It is shown that the effect of longitudinal shear force redistribution must be taken into account while calculating slip and deflection of composite beams at different stressing stages.更多还原