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为了研究梁柱刚性连接的楔形削弱型节点在循环荷载作用下的受力性能,采用有限元软件ABAQUS对两个系列共10个不同削弱参数取值的楔形削弱型节点模型进行了数值模拟分析。研究结果表明:楔形削弱型节点与翼缘狗骨形削弱节点的承载能力及滞回曲线的饱满程度相当,楔形削弱节点具有良好的滞回性能与耗能能力;楔形削弱型节点的滞回曲线呈现明显的不对称现象,且随着梁腹板削弱高度b增大,不对称现象加剧,承载能力随着参数b的增大先增大后减小,其临界值与梁高hb关系约为b/hb=0.14;削弱最深处距柱表面的距离a对节点的初始刚度没有影响,承载能力随着参数a的增大先减小后增大,其临界值约为梁高;综合节点的滞回曲线及应力分布来看,建议a/hb取为1.12左右,b/hb取为0.17~0.21。
In order to study the mechanical behavior of wedge-shaped weakened joints with rigid beam connections under cyclic loading, finite element software ABAQUS was used to simulate two series of wedge-shaped weakened joint models with 10 different weakened parameters. The results show that: the wedge-shaped weakening node and the flange dogbone weakening node bearing capacity and the fullness of the hysteresis curve equivalent, wedge-shaped weakening node has good hysteretic performance and energy dissipation; wedge weakening node hysteresis curve Showing a significant asymmetry, and with the increase of the weakened height b of the web, the asymmetric phenomenon aggravates. The bearing capacity first increases and then decreases with the increase of the parameter b, and the critical value of the bearing capacity is about b / hb = 0.14. At the deepest, the distance a from the surface of the column has no effect on the initial stiffness of the joint. The bearing capacity decreases first and then increases with the increase of the parameter a, and the critical value is about the beam height. Hysteresis curve and stress distribution point of view, the proposed a / hb taken as about 1.12, b / hb taken as 0.17 ~ 0.21.