钢框架肋板加强型弱轴连接节点的有限元分析

FINITE ELEMENT ANALYSIS OF RIB REINFORCED WEAK-AXIS CONNECTION IN STEEL FRAME

为了探讨肋板加强对于传统钢框架弱轴楔形加劲板连接的适用性,运用有限元软件ABAQUS对钢框架肋板加强型弱轴连接节点进行循环荷载作用下的参数分析。结果表明,肋板加强型弱轴连接节点具有良好的滞回性能,可以将梁上塑性铰外移至肋板末端,减小梁翼缘对接焊缝破坏的风险。建议肋板长度a=l+(0.5~0.6)h_(b),肋板高度b=0.4 a,及肋板厚度t≥1.5t_(bf),其中l为楔形加劲板的长度,h_(b)为钢梁截面高度,t_(bf)为梁翼缘厚度,且该建议参数取值适用于不同的梁柱截面,并给出了肋板加强型弱轴连接节点的设计方法。

In order to discuss the applicability of the rib reinforcement to the traditional weak-axis connections in steel frames,the finite element software ABAQUS was used to conduct a parametric analysis of rib reinforced weak-axis connections in a steel frame under cyclic loading.Analysis results showed that rib reinforced weak-axis connection had a good cyclic performance and could realize moving the plastic hinge to the end of ribs,and thus reducing the possibility of the fracture of beam flange but welds.It is suggested that,the rib length a=l+(0.5~0.6)h_(b),the rib height b=0.4 a,and the rib thickness t≥1.5_(tbf),l is the length of wedge stiffener,h_(b)is the height of the beam section,and t_(bf)is the thickness of beam flange.The proposed parameters are applicable to different beam-column sections,and the design method for rib reinforced weak-axis connections is developed.