循环荷载作用下型钢高强高性能混凝土短柱抗剪承载力研究

STUDY OF SHEAR STRENGTH OF SRHSHPC SHORT COLUMNS SUBJECTED TO CYCLIC LOADING

基于循环荷载作用下的型钢高强高性能混凝土短柱的试验结果,对影响型钢高强高性能混凝土柱剪切破坏的剪跨比、轴压比、混凝土强度、含钢率以及配箍率等主要因素进行分析。通过单独考虑钢筋混凝土部分、型钢部分、轴压力部分对柱抗剪承载力的贡献,根据叠加原理,并考虑位移延性需求的影响,分别给出型钢高强高性能混凝土短柱剪切黏结破坏以及剪切斜压破坏两种情况下的抗剪承载力计算公式。通过与试验结果的对比发现,所建立的公式能较好地反映型钢高强高性能混凝土短柱的抗剪承载力,研究结果可为型钢组合结构规范的修订以及工程设计提供理论依据和参考。

Based on the test results of steel reinforcement high strength high performance concrete （SRHSHPC） short columns subjected to cyclic loading, the aspect span ratios, concrete strength, axial compression ratios, stirrups ratios and steel ratios were studied. According to principle of superposition, the shear strength equation was established by considering the contribution of the reinforcement concrete, steel, axial compression and displacement ductility demand for the diagonal shear failure and the shear bond failure. To evaluate the accuracy of the proposed approach, the shear strength predicted by the proposed approach was compared with test results. The resulta showed that the proposed approach could estimate the shear strength of test specimens with reasonable precision. The results can supply a theoretic basis and a reference for the engineer design and revision of technical specification for steel reinforced concrete composite structures.