| Recently, more and more high-rise buildings have adopted steel reinforced high- strength concrete structure which can make better use of both steel and concrete. The frame joint is the pivot of load transfer in frames, the important position to ensure the load-bearing capacity and rigidity in structures, and the key spot in seismic buildings. The failure of the joint usually is the main reason that causes the damage of the whole frame. Therefore, widespread attention has been caught on the research of the joint both at home and abroad. With the development and application of steel reinforced concrete structure, research on the performance of the joint becomes more and more popular. Due to the complicated load-bearing and constructional detail of the joint and the brittleness of high-strength concrete, the theoretical research of steel reinforced high-strength concrete frame joint falls behind the practical application, and there are still few researches on its seismic behavior both at home or abroad in present.By conducting tests of 2 interior top-column joints of steel reinforced high-strength concrete column and reinforced concrete beam with concrete strength varies from 85.0MPa to 88.6Mpa under low cyclic reversed loading, this paper mainly study the failure patterns, hysteretic curves, skeleton curves, ductile coefficients, energy dissipation, strength degeneration and shearing performance of steel reinforced high-strength concrete joints under different core section stirrup ratios in the joint.The research findings provide premise conditions for the elastic-plastic earthquake response analysis of steel reinforced high-strength concrete structure, and give theoretical evidence to properly establish the computing theory and design method of steel reinforced high-strength concrete joints, which is about to promote the popularization and application of the superior seismic structure system.
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