双肢冷弯C型钢蒙古包刚架的平面内稳定性  

Investigation on In-Plane Stability of Double-Limb Cold-Formed C-Shaped Steel Rigid Frame of Yurt

作　　者：陈明 鲁卫波 武志远 李补拴 CHEN Ming;LU Weibo;WU Zhiyuan;LI Bushuan(College of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学土木工程学院,内蒙古包头014010

出　　处：《西南交通大学学报》2022年第1期215-222,共8页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金(51768055,52168024);内蒙古自治区自然科学基金(2021MS05061)。

摘　　要：为了解决新型双肢冷弯C型钢蒙古包结构在冰雪等竖向荷载工况下可能出现的失稳问题,对带陶脑的双肢冷弯C型钢门式刚架平面内的稳定性展开研究,通过改变斜梁坡度、刚架高跨比、陶脑直径3种参数下的刚架试验与数值模拟,对该类门式刚架的破坏形态和承载力等方面进行了分析和探讨.研究结果表明:斜梁坡度和陶脑直径的增加会使刚架承载力增加,刚架高跨比的增加会使刚架承载力降低;综合考虑斜梁坡度对刚架稳定承载力和柱顶侧移的影响,建议刚架的斜梁坡度设计为20°以内,此时《门式刚架轻型房屋钢结构技术规范》对柱计算长度系数的计算偏于安全,满足工程设计要求.To solve the instability problem of newly designed double-limb cold-formed C-shaped steel yurts under vertical loads such as ice and snow,the stability performance of a double-limb cold-formed C-shaped steel portal frame with an in-plane toono was investigated.The failure modes and bearing capacity of this type of portal frame were analyzed through testing and numerical simulations using three parameters:the slope of the inclined beam,the height-to-span ratio,and the toono diameter.The results show that increases in the inclined beam slope and the toono diameter can increase the load bearing capacity of the rigid frame,and an increase in the high span ratio of the rigid frame then reduces the rigid frame’s load bearing capacity.Following conside-ration of the influence of the inclined beam slope and the lateral displacement of the column top,the work in this paper indicates that the inclined beam slope should be designed to be within 20°,where the column effective length coefficient is calculated to be safe according to The Technical Code for Steel Structure of Light-Weight Building with Gabled Frames;this also meets the engineering design requirements.

关 键 词：冷弯型钢 带陶脑门式刚架 平面内稳定性 数值模拟 柱计算长度系数 

分 类 号：TU391[建筑科学—结构工程]