新型冷弯薄壁型钢结构钢皮剪力墙抗侧性能研究

Research on Lateral Performance of New Type Cold-Formed Steel Framed Shear Walls with Steel Sheathing and Gypsum Board

随着钢结构住宅层数的增加,传统冷弯薄壁型钢墙体已经无法适用于越来越多的多高层钢结构住宅。为此,研发了新型钢皮组合墙体。为了研究新型墙体相对于传统冷弯薄壁型钢结构组合墙体在抗侧性能上的优越性,对石膏板+钢皮的新型冷弯薄壁型钢结构复合钢皮剪力墙进行了拟静力抗震性能研究。对2片足尺组合墙试件进行了无竖向力作用下的水平单调加载,得到了试件的破坏特征、承载能力、位移、抗剪强度、抗侧刚度以及延性系数等特征参数。采用ABAQUS对水平单调加载下的组合墙体进行数值模拟研究,并将模拟结果与试验结果进行对比。研究结果表明:1)增加轻钢龙骨的厚度可以明显提升墙体的承载力、刚度以及延性。2)组合墙试件的破坏类型分为脆性破坏和延性破坏。脆性破坏是由墙体边立柱受压屈曲导致,破坏过程耗能较少。延性破坏发生在墙体面板以及自攻螺钉连接处,破坏过程耗能较多。3)轻钢龙骨厚度与墙板钢皮总厚度的比值对组合墙试件的破坏模式起着控制作用。在墙体设计中,应保证龙骨的壁厚(或对边柱进行适当加强),合理设计钢皮的厚度,使其成为延性破坏构件。4)有限元模拟结果与试验结果误差相对较小,模拟破坏现象和试验实际破坏特征也基本符合。

With the increase of the higher steel residential buildings,the traditional cold-formed steel wall is not suitable for the high-rise and mid-rise buildings.For this reason,a novel cold-formed steel wall was developed.In order to newly study the superiority of the steel skin composite wall to the traditional cold-formed thin-walled steel structure composite wall in lateral resistance,the new cold-formed thin-wall steel structure composite steel skin shear wall of gypsum board+steel sheathing.The research on seismic performance was carried out.The two monolithic composite wall specimens were horizontally monotonously loaded without vertical force,and the characteristic parameters such as the failure characteristics,bearing capacity,displacement,shear strength and lateral rigidity of the specimen were obtained.Using ABAQUS to conduct numerical simulation research on the composite wall under horizontal monotonic loading,and numerical results were compared to the test results.The results show that increasing the thickness of studs can significantly enhance the bearing capacity,stiffness and ductility of the shear wall.The failure types of the wall are brittle failure and ductile failure.Brittle failure is caused by buckling of wall side columns under compression.Ductile failure occurs at the joint of wall panel and tapping screws,and the failure process consumes more energy.The ratio of the stud thickness to the total thickness of the sheathing plays a controlling role in the failure mode of the composite walls.In the design,the stud thickness should be guaranteed,and the thickness of the steel sheathing should be rationally designed to make the wall ductile.In addition,the finite element numerical simulation results are in good agreement with the test results which shows the method used in this paper can effectively predict the mechanical performance of the composite wall.