不等肢异形柱框架边节点抗裂承载力研究

Research on crack resistance of exterior joints with special-shaped column with different limb lengths

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。

To investigate the influence of limb length on failure modes and crack resistance of joint with special-shaped column,four reinforced concrete(RC) exterior joints with special-shaped column with different limb lengths were tested under reversed cyclic loading.The experimental results show that the crack development and the crack resistance of the joints were affected by the limb dimension.Moreover,according to the forces from beams and columns acting on joint core,the anti-crack resistance formula of joint with special-shaped columns was proposed,and the expressions for calculating the frame joint core effective height and effective width which relates to the size of limbs are presented based on elasticity theory.The calculating results agree well with test results.