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为研究节点核心区采用与梁等强度的低强度混凝土浇筑的夹心节点的抗震性能,通过3组不同柱与梁混凝土强度比的空间夹心节点和传统节点(节点核心区混凝土与柱等强)的对比试件在双向低周往复荷载作用的性能试验研究,对比分析了各组试件的破坏形态、延性、耗能、变形等差异。研究结果表明:中低剪压比夹心节点的整体抗震性能稍弱于传统节点,相差不明显;中低轴压比、剪压比条件下,当柱与梁混凝土强度比小于1.5时,节点区可直接采用与梁相同强度的混凝土浇筑,当柱与梁混凝土强度比大于1.5时,其破坏形式转变为节点核心区剪切破坏,需采取相应的结构措施予以加强;采用平面节点软化拉-压杆模型,建立了承受双向水平荷载的空间节点软化拉-压杆受剪模型与受剪承载力的计算式,并将其计算结果与试验结果进行了校验,两者吻合较好。
In order to study the seismic performance of sandwich nodes with low strength concrete pouring in the core area of the node, three kinds of space-filled sandwich nodes with different column-beam concrete strength ratios are compared with those of the traditional nodes (the core of the node is strong) The experimental study on the reciprocating load of two-way low-cycle reciprocal load test shows that the damage morphology, ductility, energy dissipation and deformation of the test specimens are comparatively analyzed. The results show that the overall seismic performance of the sandwich joints with middle-low shear ratio is slightly weaker than that of the traditional joints, and the difference is not obvious. Under the condition of middle-low axial compression ratio and shear compression ratio, when the strength ratio of column to beam concrete is less than 1.5, When the strength ratio of column to beam concrete is more than 1.5, the failure mode changes to the shear failure in the core area of the node, and corresponding structural measures should be taken to be strengthened. The plane node softening pull-pressure Rod model, the formula of shear softening-pressure-bar shear model and shear capacity of space joints subjected to bidirectional horizontal load is established, and the calculation results and test results are verified.