钢骨超高强混凝土框架边节点抗震性能试验研究

摘要

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 steel ultra high strength concrete(SRUHSC) frame joints,a total of six SRUHSC exterior joints were carried out under low-frequency cyclic lateral loading.The parameters considered were axial pressure coefficient and volumetric ratio of stirrup.The seismic behavior of the exterior joints,including failure patterns,ductility,energy dissipation,shear capacity and shear stirrups ultimate strain.The results show that: the value of 0.38 as a dividing point about the effect of axial compression ratio on the seismic performance of SRUHSC exterior joints should be taken into account in design.With the increase of axial pressure coefficient,the failure process shows small eccentric compression failure instead of beading-shear failure.And the shear capacity firstly increases and then decreases with the increase of axial pressure coefficient.