加劲肋对RBS型梁柱节点的滞回性能的影响

Influence of Stiffeners on Cyclic Performance of Beam-to-column Connections with RBS

为了探讨加劲肋对RBS型梁柱节点滞回性能的影响,运用有限元软件ABAQUS对梁腹板两侧各设置一块水平向加劲肋的RBS型梁柱节点进行系列参数分析,并对不同加劲肋形式的RBS型梁柱节点的滞回行为进行对比。研究结果表明,设置加劲肋的RBS型梁柱节点的荷载-位移滞回曲线均呈饱满的梭形,对RBS型梁柱节点的初始刚度基本没有影响,且均可以实现梁上塑性铰外移。设置水平向加劲肋可以提高RBS型梁柱节点的延性和耗能性能,建议水平向加劲肋的厚度t和宽度b可分别取为0.5倍的梁腹板厚度和梁翼缘宽度,长度l取为柱翼缘表面至梁翼缘RBS削弱处终止位置的距离。相对而言,设置水平向加劲肋的RBS型梁柱节点的滞回性能优于设置竖向加劲肋的,且梁腹板两侧各设置两块水平向加劲肋的RBS型梁柱节点具有更优越的滞回性能。

In order to investigate the influence of the stiffeners on the cyclic performance of RBS beam-to-column connections,the finite element software ABAQUS was used to conduct a parametric study on the RBS beam-to-column connection with a stiffener on both sides of the beam web,and to compare the cyclic behavior of RBS beam-to-column connections with different kinds of stiffeners.Results showed that the load-displacement hysteresis curves of RBS connections with stiffeners were full fusiform,and the stiffeners had little influence on the initial stiffness of RBS connections,and could move the plastic hinge away from the joint region.Horizontal stiffeners could improve the ductility and energy dissipation of RBS connections The horizontal stiffeners'thickness t and width b can be set to 0.5 times of beam web thickness and beam flange width,and the length 1 can be set to the distance between the surface of the column flange and the end the reduced region.Relatively,the hysteresis performance of RBS connections with horizontal stiffeners precede that of RBS connections with vertical stiffeners,and the RBS connections with double horizontal stiffeners on both sides of the beam web showed better hysteretic behavior.