新型冷弯薄壁型钢板剪力墙抗侧性能试验研究

Experimental Study on the Lateral Performance of New Cold-Formed Thin-Walled Steel Plate Shear Walls

为了研究新型冷弯薄壁型钢板剪力墙的抗侧性能,以C形+U形龙骨抱合的形式作为剪力墙试件的边柱截面形式,并在边柱之间设置薄钢板,共设计了两种不同宽度的剪力墙试件,对两种剪力墙试件均进行了单调加载和低周往复加载试验。通过试验得到了新型冷弯薄壁型钢板剪力墙在各阶段的荷载及位移特征值、荷载-位移曲线、骨架曲线及破坏形态,并对结构的破坏特征、耗能能力、刚度及承载力退化进行了分析。试验结果表明:新型冷弯薄壁型钢板剪力墙通过边柱之间的薄钢板受力形成钢拉力带与边柱一起共同承受水平荷载,表现出良好的抗侧性能,其破坏形式均为边柱被压溃或撕裂而导致试件破坏;同时发现,减小墙体的高宽比可以提高剪力墙的耗能性能、刚度及承载力,明显改善墙体的抗侧性能。

In order to study the lateral performance of a new cold-formed thin-walled steel plate shear wall, a test is conducted using C + U-shaped keel as the side column section of the wall specimen.Thin steel plates are placed between the new cold-formed thin-walled steel side columns.For thin steel plates, two shear wall specimens with different widths are designed, and monotonic loading and low cyclic loading tests are carried out on these two shear wall specimens respectively.The performance at each stage, including load-displacement curves, skeleton curves, failure mode of the new cold-formed thin-walled steel plate is obtained during the tests.The failure characteristics, energy dissipation capacity, stiffness and bearing capacity degradation of the new cold-formed thin-walled steel plate are analyzed.The test results show that a steel tension band is formed on this steel plate shear wall to resist horizontal load together with side columns, which shows a good lateral performance.The side column is seriously buckled or torn, which leads to the damage of the specimen.Also, reducing the aspect ratio can improve the energy dissipation performance, rigidity and bearing capacity of the wall, and significantly improve the lateral performance.