考虑覆板承载的开孔冷弯薄壁型钢组合墙体压弯性能研究  

Compression and bending performance of cold-formed thin-walled steel perforated stud walls considering the bearing capacity of sheathing

作　　者：任重[1] 杨碧伟 何文福[1] 陈阳[1] 戴柳丝 Ren Chong;Yang Bi-wei;He Wen-fu;Chen Yang;Dai Liu-si(School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学力学与工程科学学院,上海200444

出　　处：《工程抗震与加固改造》2022年第3期30-39,29,共11页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金青年科学基金项目(51908347,51508402)。

摘　　要：为研究考虑覆板承载的开孔冷弯薄壁型钢组合墙体压弯性能,对两块覆面材料分别为水泥纤维板(CFB)和定向刨花板(OSB)的腹板开孔冷弯薄壁型钢组合墙体进行压弯试验,揭示了试件的受力特征和屈曲破坏模式,结果表明:组合墙体在压弯作用下的破坏模式为龙骨局部-畸变相关屈曲;与水泥纤维板覆面的组合墙体相比,定向刨花板覆面的组合墙体承载力提升5%。在试验基础上,本文将龙骨所受覆板、拉条、导轨约束作用简化为弹簧,建立有限元简化模型,通过与试验和单组模型所得的破坏模式和压弯承载力对比,验证了模型的准确性,进而考虑覆板材料和龙骨几何特征对组合墙体进行参数分析。最后,基于冷弯薄壁型钢结构直接强度法设计框架,提出适用于多种约束作用下开孔冷弯薄壁型钢组合墙体的压弯承载力计算公式。In order to investigate the compression and bending performance of cold-formed thin-walled steel perforated stud walls considering the bearing capacity of sheathing, the full-scale tests of two cold-formed thin-walled steel perforated stud walls sheathed with cement fiber board(CFB) and oriented strand board(OSB) respectively under compression-bending loading are conducted. Structural behavior and failure modes of all tested specimens are analyzed. The results show that: the failure modes of the stud walls under axial compression and bending are stud local-distortional buckling interaction;the ultimate load of the stud walls sheathed with OSB is 5% higher than that sheathed with CFB. Furthermore, a finite element model is established by simplifying the restraint of sheathing, strap, and track to spring restraint. The results of simplified finite element model agree with finite element model and test results. Based on the simplified finite element model, parametric study considering sheathing material and stud geometry is carried out. Finally, modified direct strength method(DSM) formulae are proposed to calculate the compression-bending load of cold-formed thin-walled steel perforated stud walls with multiple restraints.

关 键 词：开孔冷弯薄壁型钢组合墙体 压弯试验 屈曲相互作用 数值模拟 直接强度法 

分 类 号：TU392.1[建筑科学—结构工程] TU317.1