钢骨超高强混凝土框架边节点抗震性能试验研究

Experimental study on the seismic behavior of steel ultra high strength concrete frame joints

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 to-tal of six SRUHSC exterior joints were carried out under low-frequency cyclic lateral loading. The parameters con-sidered were axial pressure coefficient and volumetric ratio of stirrup. The seismic behavior of the exterior joints, in- cluding 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 perform-ance of SRUHSC exterior joints should be taken into account in design. With the increase of axial pressure coeffi-cient, 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.