双拼冷弯C型钢节点初始刚度及承载力理论计算研究
引用文献：
孙芳芳 陈明. 双拼冷弯C型钢节点初始刚度及承载力理论计算研究[J]. 建筑结构，2023，48（10）：67-73.
SUN Fangfang CHEN Ming. Research on theoretical calculation of initial stiffness and bearing capacity of double cold-formed C-section steel joints[J]. Building Structure，2023,48（10）：67-73.
摘要：为了研究冷弯C型钢节点的受力性能，发挥其在冷弯薄壁型钢结构中的作用，建立双拼冷弯C型钢梁柱节点力学模型，依据力学原理分别对梁和节点板进行受力分析，建立模型的受力与变形的关系，得出节点在弹性阶段的转角变形及初始刚度的理论计算公式，并根据节点的不同破坏形态计算其屈服承载力。考虑节点板厚度、螺栓间距和C型钢尺寸三种主要影响因素，建立ANSYS有限元模型，进行模拟计算与分析，得到屈服承载力和初始刚度模拟值，将由理论公式计算的理论值与其进行对比验证。研究结果显示：屈服承载力和初始刚度理论值与模拟值均基本接近，说明理论计算公式是合理且可靠的，能够应用于冷弯薄壁C型钢节点的计算当中。
关键词：冷弯C型钢；初始刚度；屈服承载力；节点；理论公式；
基金：国家自然科学基金项目(52168024、51768055)；内蒙古自然科学基金项目(2021MS05061)。
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[18] 王乾，赵金城.钢框架柱栓焊混合拼接节点初始刚度计算及有限元分析[J].建筑结构，2020,50(15):118-125.
[19] 刘建，陈勇，曹洲，等.基于一阶薄壁梁理论的开口截面剪应力不均匀系数的精确计算[J].工业建筑，2015,45(10):155-160.
[20] 张健.冷弯型钢梁柱节点的受力性能研究[D].包头：内蒙古科技大学，2007.
[2] KIM T W,WILCOSKI J,FOUTCH D A,et al.Shaketable tests of a cold-formed steel shear panel[J].Engineering Structures,2006,28(10):1462-1470.
[3] 石宇，周绪红，聂少锋，等.多层冷弯薄壁型钢结构住宅的地震响应分析[J].工程抗震与加固改造，2011,33(5):7-12,26.
[4] 吴函恒，周天华，石宇，等.地震作用下冷弯薄壁型钢结构房屋弹塑性位移简化计算研究[J].工程力学，2013,30(7):180-186.
[5] PETERS G K.An investigation of the effects of fastener spacing in built-up cold-formed steel compression members[D].Halifax,Nova Scotia:Dalhousie University,2003.
[6] 彭雄，杨娜，孟庆桐.冷弯薄壁型钢组合截面构件试验研究与数值模拟[J].工程力学，2012,29(9):272-277,293.
[7] YU W K,WONG M F,CHUNG K F.Analysis of bolted moment connections in cold-formed steel beam-column sub-frames[J].Journal of Constructional Steel Research,2005,61(9):1332-1352.
[8] CHUNG K F,IP K H.Finite element modeling of bolted connections between cold-formed steel strips and hot rolled steel plates under static shear loading[J].Engineering Structures,2000,22(10):1271-1284.
[9] WONG M F,CHUNG K F.Structural behavior of bolted moment connections in cold-formed steel beam-column sub-frames[J].Journal of Constructional Steel Research,2002,58(2):253-274.
[10] CHUNG K F,LAWSON R M.Structural performance of shear resisting connections between cold-formed steel sections using web cleats of cold-formed steel strip[J].Engineering Structures,2000,22(10):1350-1366.
[11] 李倩.双拼冷弯薄壁C型钢梁柱节点力学性能研究[D].包头：内蒙古科技大学，2013.
[12] 陈明，邵斐璠，于洲欢，等.冷弯薄壁双肢C型钢十字形节点抗震性能[J].工程抗震与加固改造，2020,42(3):76-83.
[13] 陈明，于洲欢.双肢C型钢L形节点静力性能影响因素研究[J].钢结构，2017,32(12):62-66.
[14] 陈明，孙芳芳.双肢冷弯C型钢门式刚架节点抗震性能研究[J].工程抗震与加固改造，2015,37(2):83-89,82.
[15] 陈明，边伟，孙芳芳，等.带垫板双肢背靠背C型钢轴压短柱承载力分析[J].建筑结构，2013,43(S1):1447-1450.
[16] 陈明，吉晔晨.双肢冷弯C型钢支撑框架抗震性能试验研究[J].建筑结构，2017,47(23):55-60.
[17] 万梦琦，陈明.冷弯C形钢蒙古包刚架抗震性能分析[J].建筑钢结构进展，2020,22(3):12-21.
[18] 王乾，赵金城.钢框架柱栓焊混合拼接节点初始刚度计算及有限元分析[J].建筑结构，2020,50(15):118-125.
[19] 刘建，陈勇，曹洲，等.基于一阶薄壁梁理论的开口截面剪应力不均匀系数的精确计算[J].工业建筑，2015,45(10):155-160.
[20] 张健.冷弯型钢梁柱节点的受力性能研究[D].包头：内蒙古科技大学，2007.
Research on theoretical calculation of initial stiffness and bearing capacity of double cold-formed C-section steel joints
Abstract: In order to study the mechanical behavior of cold-formed C-section steel joints, and play its role in cold-formed thin-walled steel structures, the mechanics analysis model of double cold-formed C-section steel beam-to-column joint was established, the mechanics analysis of beam and joint plate were carried out respectively according to the principle of mechanics, the relationship between force and deformation of the model was established, the theoretical calculation formulas for the rotational angle and initial stiffness of the joint in the elastic stage were obtained, and the yield bearing capacity was calculated according to different failure patterns of the joint. Considering the three main influencing factors such as joint plate thickness, bolt spacing, and C-section steel size, the finite element model of ANSYS was established, and the simulation computation and analysis were carried out, the simulated values of yield bearing capacity and initial stiffness were obtained and compared with the theoretical values calculated by the theoretical formulas proposed. The results show that the theoretical values of yield bearing capacity and initial stiffness are basically close to the simulated values, the theoretical calculation formulas are reasonable and reliable, these can be applied to the calculation of cold-formed thin-walled C-section steel joints.
Keywords: cold-formed C-section steel; initial stiffness; yield bearing capacity; joint; theoretical formula
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