钢骨高强混凝土短柱抗震性能的试验研究

针对目前高层、大跨结构中广泛应用的高强混凝土所具有的"脆性"特点,本文拟通过在高强混凝土柱中内置钢骨,来改善高强混凝土的脆性,增加高强混凝土结构的抗震延性。本文开展了13根剪跨比为2.0的试件在低周反复荷载下的试验,对内置钢骨的高强混凝土短柱抗震性能进行了研究。分析了钢骨高强混凝土短柱的破坏特征、滞回特性以及骨架曲线,研究了轴压比和配箍率对钢骨高强混凝土短柱抗震延性的影响,并得出了轴压比和位移延性系数的关系以及配箍率和位移延性系数的关系。根据本文试验结果,提出了满足一定位移延性要求的钢骨高强混凝土短柱的轴压比限值和柱箍筋加密区最小体积配箍率,试验结果可为规范修订和工程设计提供参考。

Experimental research on steel reinforced high-strength concrete short columns in seismic performance

For the brittleness of high strength concrete widely used in high-rise building and long-span construction,steel is encased in high strength concrete to decrease the brittleness and improve the ductility of high strength concrete structures.The experimental research on seismic performance of thirteen steel encased in high strength concrete short column(λ=2.0) subjected to low cyclic reversed lateral loads is carried out.The failure characteristics,hysteretic characteristics and skeleton curves of steel encased in high strength concrete short column are analyzed.The influences of axial compression and stirrup ratio on the seismic performance are studied.The relation curves of axial compression ratio and stirrup ratio to displacement ductility coefficient are concluded.According to the experimental results,the limited values of axial compression and minimum hoop reinforcement ratio are suggested,which satisfy the certain ductility requirements.The suggested values may provide reference for codes revision and engineering design.