双片OSB覆面冷弯薄壁型钢墙体滞回性能研究  

Research on the Hysteretic Behavior of Double OSB Sheathed Cold-Formed Steel Wall

作　　者：刘朋 钱哲 王连广[2] SCHAFER Benjamin 王元清[4] LIU Peng;QIAN Zhe;WANG Lianguang;SCHAFER Benjamin;WANG Yuanqing(School of Architectural and Civil Engineering,Shenyang University of Technology,Shenyang 110870,China;School of Resources and Civil Engineering,Northeastern University,Shenyang 110004,China;Department of Civil Engineering,Johns Hopkins University,Baltimore 21218,USA;School of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]沈阳工业大学建筑与土木工程学院,沈阳110870 [2]东北大学资源与土木工程学院,沈阳110004 [3]约翰霍普金斯大学土木工程系,巴尔的摩21218 [4]清华大学土木水利学院,北京100084

出　　处：《建筑钢结构进展》2022年第3期72-79,共8页Progress in Steel Building Structures

基　　金：国家自然科学基金(51038006)。

摘　　要：为了研究墙体构造对双片OSB覆面冷弯薄壁型钢墙体滞回性能的影响,进行了单调和低周反复荷载下6个冷弯薄壁型钢墙体的试验研究,分析了边梁、石膏板及副龙骨等参数对墙体抗剪承载力、滞回性能及延性的影响,试验结果表明:边梁的存在使墙体承载力提高了12%左右;内侧添加石膏板使组合墙的初始刚度提高了20%左右,但对延性比和极限承载力对应位移影响较小,说明试件荷载-位移曲线下降段的力学性能主要是依靠更强的OSB和冷弯型钢框架的连接;减小副龙骨的厚度和强度会降低组合墙的承载力、初始刚度及极限承载力对应位移。试件破坏集中在组合墙边立柱下部的1/3处、底部导轨及垂直板缝处,未见副龙骨局部屈曲破坏;试件破坏模式为螺钉左右倾斜并拔出OSB,组合墙角部出现螺钉剪断及OSB被撕裂。试件滞回曲线呈“捏缩”状,荷载-位移曲线下降段的承载力衰减和刚度退化明显,且耗能较低。In order to study the influence of wall structure on the hysteretic behavior of double OSB sheathed cold-formed steel wall,six cold-formed thin-walled steel walls under monotonic and low-cycle cyclic loading are tested. The influence of parameters such as edge beam,gypsum board and auxiliary stud on shear capacity,hysteretic performance and ductility of the wall are studied. The test results show that the edge beam can increase the bearing capacity of the wall by 12%.The addition of gypsum board improves the initial stiffness of the composite wall for 20%,but the impact to the ductility ratio and displacement corresponding to the ultimate bearing capacity is small,indicating that the mechanical properties of the load drop section of the specimen mainly rely on the connection between the stronger OSB and the cold-formed steel frame. Reducing the thickness and strength of the auxiliary stud will reduce the bearing capacity,initial stiffness and displacement corresponding to the ultimate bearing capacity of the composite wall. The damage of specimen is concentrated in the lower 1/3 of the column on the side of the combined wall,the bottom guide rail and the vertical board seam. No partial buckling damage of the auxiliary stud is observed. The failure mode of specimen is that the screw tilts left and right and the OSB is pulled out. The screw is found to be sheared at the corner of the combined wall,and the OSB is torn. The hysteretic curve of the specimen shows a "pinch" shape,the bearing capacity attenuation and stiffness degradation at the declining section of the load-displacement curve are obvious,and the energy dissipation is low.

关 键 词：冷弯薄壁型钢墙体 滞回性能 OSB 石膏板 板缝 

分 类 号：TU391[建筑科学—结构工程]