(内蒙古科技大学土木工程学院,包头 014010)

摘要: 双肢冷弯 C 形钢门式刚架是一种新型组合截面门式刚架结构体系,该结构的构件通过垫板和高强螺栓将冷弯型钢拼合成双轴对称截面,便于梁柱节点的连接,有效提升了构件的承载能力.对 5 个刚架进行拟静力试验,对 11 个刚架进行有限元分析,以分析梁腹板高度、C 形钢厚度、柱翼缘宽度、柱腹板高度、节点板厚度、屋面坡度和刚架跨度 7 个参数对双肢冷弯 C 形钢门式刚架破坏形态和抗震性能的影响.分析结果表明,C 形钢厚度、柱腹板高度、柱翼缘宽度、刚架跨度对双肢冷弯 C 形钢门式刚架抗震性能影响显著,并根据正交试验分析结果发现了影响该类结构极限承载力和柱顶破坏位移的参数顺序,得到了两项结果最大时的参数组合,推导出了在适用范围内刚架抗震性能特征极限承载力和柱顶破坏位移的计算公式.

关键词: 冷弯 C 形钢;门式刚架;螺栓垫板连接;高强螺栓;破坏形态;抗震性能

中图分类号:TU391 文献标志码:A 文章编号:1002-848X(2022)18-0108-07

DOI:10.19701 / j.jzjg.LS210235

Study on seismic performance of double-limb cold-formed C-shapedsteel portal frame with bolt plate connection

CHEN Ming,WANG Huiling,LI Bushuan,JI Yechen

(School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China)

Abstract: The double-limb cold-formed C-shaped steel portal frame is a new type of composite section portal framestructure. The components of the structure are assembled into a biaxially symmetrical section through cushion plate andhigh-strength bolts,which is convenient for beam-column joints and effectively improves the load-bearing capacity of thecomponents. The quasi-static test was carried out on 5 rigid frames,and the finite element analysis was carried out on 11rigid frames to analyze the influence of 7 parameters including beam web height,C-shaped steel thickness,column flangewidth,column web height,joint plate thickness,roof slope and portal frame span on the failure mode and seismicperformance of double-limb cold-formed C-shaped steel portal frame. The analysis results show that C-shaped steelthickness,column web height,column flange width,and the portal frame span has significant influence on the seismicperformance of the cold-formed C-shaped steel portal frame with two limbs. According to the results of orthogonal testanalysis,the sequence of parameters affecting the ultimate bearing capacity and column top failure displacement of this typeof structure was found,and the parameter combination when the two results were the largest was obtained,and calculationformulas were deduced for ultimate bearing capacity and column top failure displacement for seismic performancecharacteristics of portal frame.

Keywords: cold-formed C-shaped steel;portal frame;bolt plate connection;high-strength bolt;failure mode;seismic performance

∗国家自然科学基金(51768055,52168024),内蒙古自然科学基金(2021MS05061).

第一作者:陈明,博士,教授,博士生导师,主要从事钢结构和空间结构的设计与理论研究,Email: cmlx-1978@ 163. com.

[引用本文] 陈明,王慧玲,李补拴,等. 螺栓垫板连接式双肢冷弯 C 形钢门式刚架抗震性能研究[ J]. 建筑结构,2022,52(18):108-114,47. CHEN Ming,WANG Huiling,LI Bushuan,et al. Study on seismic performance of double-limbcold-formed C-shaped steel portal frame with bolt plate connection[J]. Building Structure,2022,52(18):108-114,47.