型钢混凝土T形柱受剪性能及承载力计算

Research on shear performance and bearing capacity calculation method of T-shaped steel reinforced concrete columns

为了研究型钢混凝土(SRC)T形柱斜截面抗剪承载性能,设计了4个试件进行静力单调加载试验,考虑了剪跨比、轴压比、配钢形式、翼缘尺寸4个变化参数,通过试验观察了试件的受力全过程和破坏形态。根据实测数据,给出了混凝土应变沿截面高度的分布情况以及荷载-应变、荷载-挠度等重要关系曲线;并分析了各变化参数对抗剪承载力的影响,提出了承载力计算公式。研究结果表明:型钢混凝土T形柱受力过程中截面应变基本符合平截面假定;剪跨比、轴压比、配钢形式、翼缘尺寸等参数对其抗剪强度有显著影响;基于叠加法的抗剪强度计算公式可用于其斜截面极限承载力计算。

In order to study the shear bearing capacity of inclined section in T-shaped steel reinforced concrete（SRC） columns,4 specimens with different shear span ratios,axial compression ratios,steel form and flange dimension were designed and produced to carry out monotonic static shear loading test.The whole loading process and failure pattern were watched and the curves of concrete strain distribution along cross section height,load-strain and load-deflection were drawn based on the measured data.The impact of parameters on the shear capacity was analyzed,and the formula for calculating capacity was proposed.It is shown that average strain of T-shaped section conforms to plane section assumption.Shear span ratios,axial compression ratios,steel form and flange dimension have significant effect on the shear strength.The calculation formula of shear strength can be used to calculate ultimate bearing capacity of inclined section.