钢筋砼简支开洞深梁受剪承载力的极限分析

Limit Analysis of Shear Strength of Simply Supported R.C.Deep Beams with Web Openings

本文在试验研究的基础上分析了钢筋砼简支开洞深梁在顶部集中荷载作用下的工作性能和破坏形态,给出了相应的破坏机构。假定钢筋和砼均为刚塑性材料,引用砼双向受压的破坏条件求出了剪切破坏面受剪承戴力的塑性解,并进而求出各种破坏机构对应的受剪承载力公式,提出了按塑性极限分析计算开洞深梁受剪承载力的方法,计算结果怀国内外试验资料符合均较好。

In this paper,based on experiments and research, the behavior, the failure modes and the mechanisms of simply supported R.C. deep beams with web opening under concentrated loading on the top are discussed. Assuming both reinforcement and concrete as rigid plastic materials and using the failure criterion of concrete in biaxial compression, the plastic solution for shear strength of the failure section and the formulas for predicting the shear strength of R.C.deep beams with web openings in regards to different failure mechanisms have been obtained. Finally, the method for limit analysis of shear strength of such deep beams is suggested,and the calculated results show a good agreement with the test results a-vailable at home and abroad.