摘要
为研究梁柱斜交顶底角钢节点中单肢弧形角钢的滞回性能,文中共设计制作了6个系列37个单肢弧形角钢试件,重点考虑了角度、角钢厚度、角钢圆弧半径、柱肢长度、加劲肋厚度及加劲肋形式对其滞回性能的影响;并采用有限元软件ABAQUS对该角钢试件进行了数值模拟,系统分析了相关参数对单肢弧形角钢初始刚度、屈服后刚度、屈服承载力、破坏模式、耗能能力等性能的影响。在GARLOCK等提出的单肢直角钢恢复力模型的基础上,提出了单肢弧形角钢的恢复力模型。分析结果表明:加劲肋的设置改变了单肢弧形角钢的屈服模式,未设置加劲肋的单肢弧形角钢在角钢圆弧的中间部位、柱肢连接高强螺栓边缘处形成了两条塑性铰线;设置加劲肋的单肢弧形角钢分别在柱肢加劲肋两侧和角钢圆弧中间部位形成了塑性铰线;角度对钝角角钢力学性能的影响显著大于对锐角角钢力学性能的影响,增大角钢厚度、减少柱肢长度、增设加劲肋等措施均可提高单肢弧形角钢的初始刚度、屈服承载力和耗能能力,其余参数影响相对较小;基于理论分析给出了带肋和未设置加劲肋的单肢弧形角钢的初始刚度、屈服后刚度、屈服承载力的理论计算公式,构建的斜向单肢弧形角钢恢复力模型能有效预估其滞回特征,具有较高的计算精度,可用于此类节点的工程设计中。
In order to study the hysteretic behavior of single arc angle in the sloped top-bottom angle beam-to-column connection,a total of 37 specimens of 6 series single arc angles were designed,and the related parameters of angle,angle thickness,arc radius of angle steel,column limb length,stiffener thickness,stiffener type were considered.The finite element software of ABAQUS was adopted for numerical simulation,and the influence of related parameters on the initial stiffness,post-yield stiffness,yield strength,failure mode and energy dissipation capacity of single arc angle were systematically analyzed.Based on the angle restoring force model proposed by GARLOCK et al,the macro restoring force model of single arc angle was developed in the current study.The analytical results show that the employment of stiffener changed the failure mode of single arc angle.For the single arc angle without stiffener,two plastic hinge lines occurred at the middle region of the arc location and the edge region of high-strength bolt connected column limb.For the stiffener angle with stiffener,the plastic hinge lines developed between the two sides of stiffener and the middle region of the arc location.The influence of angle parameter on the mechanical behavior of obtuse-angled single arc angle was larger than that of acute-angled single arc angle.Increasing the angle thickness,reducing the length of column limb and adding stiffener could improve the initial stiffness,yield bearing capacity and energy dissipation capacity of single arc angle,and the influence of other parameters was relatively small.Based on the theoretical analysis,the calculation formulas of initial stiffness,post-yield stiffness and yield bearing capacity of single arc angle with and without stiffener were proposed.The proposed restoring force model of sloped single arc angle can effectively predict its hysteretic behavior with enough accuracy,and it can be used for engineering design and analysis of this type of sloped beam-to-column connection.
作者
龚富涛
孙国华
黎智琴
GONG Futao;SUN Guohua;LI Zhiqin(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,China)
出处
《建筑钢结构进展》
北大核心
2025年第9期27-39,51,109,共15页
Progress in Steel Building Structures
基金
国家自然科学基金(51578355,52378173)。
关键词
单肢弧形角钢
斜交连接
初始刚度
屈服承载力
有限元分析
恢复力模型
滞回性能
single arc angle
sloped connection
initial stiffness
yield capacity
finite element analysis
restoring force model
hysteretic behavior
