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为研究钢骨超高强混凝土框架边节点的抗震性能,开展了6个钢骨超高强混凝土框架边节点试件的低周反复加载试验。试件设计参数为轴压比、配箍率。针对不同设计参数试件的破坏形态、延性、耗能能力、抗剪承载力及箍筋应变等进行了分析,得到了各设计参数的影响规律。研究结果表明:轴压比对钢骨超高强混凝土边节点抗震性能的影响以0.38为分界点,随着轴压比增大,节点组合体破坏形态由弯剪破坏转变为小偏心受压破坏,其节点核心区水平抗剪承载力在试验轴压比区间内,也表现为先增大后下降的变化规律。该研究结果为钢骨超高强混凝土框架节点抗震设计提供了重要依据。
In order to study the seismic behavior of the edge joints of SRHC frames, tests were carried out on the low-cycle loadings of the specimens of six SRHC frames. Specimen design parameters for the axial compression ratio, with hoop rate. The failure modes, ductility, energy dissipation capacity, shear capacity and stirrups strain of specimens with different design parameters were analyzed. The influence law of each design parameter was obtained. The results show that the influence of axial compression ratio on the seismic performance of ultra-high-strength concrete (SRCB) joints is 0.38, and as the axial compression ratio increases, the failure mode of the joint assembly changes from bending failure to small eccentric compression failure. The horizontal shear strength at the core of the node is also shown as the law of first increase and then decrease in the axial compression ratio range. The result of this study provides an important basis for the seismic design of steel reinforced super-high strength concrete frame joints.