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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 load-carrying capacity of T-shaped columns with SRC, four specimens were designed for static monotonic loading tests. Considering shear span ratio, axial compression ratio, steel distribution form and flange size, Parameters, through the test observed the whole process of the specimen stress and damage morphology. According to the measured data, the distribution of strain along the cross-section height of the concrete and the important curves of load-strain, load-deflection and so on are given. The influence of various parameters on the shear capacity is analyzed and the bearing capacity formula is proposed. The results show that the cross-section strain of the T-shaped steel column is basically in accordance with the assumption of flat section. The shear-span ratio, axial compression ratio, the form of the steel, the size of the flange and other parameters have significant influence on the shear strength. The shear strength calculation formula can be used to calculate the ultimate bearing capacity of oblique section.