箍筋布置方式对斜次梁抗剪性能的影响

摘要

运用空间桁架模型建立主次梁斜交时（次梁为斜梁）次梁受力模型，引用混凝土双向受力状态下强度理论和破坏准则，推导出斜次梁受剪构件极限承载力公式。并通过模型梁试验、有限元数值模拟两种方法，分别分析了斜次梁箍筋布置方式对其抗剪承载力的影响。试验结果及有限元分析表明，当箍筋与纵筋取不同夹角时，各模型破坏模式、挠曲线变化与极限承载力相近，说明其夹角对斜次梁的抗剪承载力影响很小。%The secondary beam mechanical model is established by using space truss model when the primary and secondary beams( the secondary beam is skew)cross. And the skew shear bearing capacity formula is deduced during the strength theory and failure criterion of concrete under biaxial stress state. The effect of stirrup layout on RC beam shear strength is studied through model test and FEM analysis. The results show that the difference between failure modes, flex line and ultimate bearing capacity is small when stirrups and longitudinal reinforcement taking different angle,which proves that included angle has little effect on the shear capacity of skew secondary beam.