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为了分析不同柱肢尺寸对节点破坏形态和抗裂承载力的影响,对4个钢筋混凝土不等肢异形柱框架边节点进行了低周反复荷载作用下抗震性能试验研究。试验结果表明:节点的破坏形态、抗裂承载力随着柱肢尺寸不同而发生变化。在分析钢筋混凝土不等肢异形柱节点受力的基础上,提出了异形柱节点抗裂承载力计算公式,应用弹性理论给出了考虑翼缘柱肢影响的异形柱节点核心区截面有效宽度、截面有效高度的表达式。将提出的节点抗裂承载力计算公式与试验结果进行比较,发现两者吻合较好。
In order to analyze the effect of different column-leg sizes on the failure modes and the capacity of cracking-resistant joints, the seismic performance of four RC columns with different angles and columns subjected to low-cycle repeated loading was studied. The experimental results show that the failure morphology and the crack resistance capacity of the joints change with the size of the limbs. Based on the analysis of the stress of special-shaped columns with unequal-shaped bars, the formula for calculating the crack-resistant capacity of special-shaped columns is proposed. The effective width of core section of special-shaped columns is given by using elastic theory. Section effective height expression. Comparing the formula of calculating the crack resistance bearing capacity of the proposed node with the test result, it is found that the two agree well with each other.