自复位钢框架-蝴蝶形钢板剪力墙体系两层结构抗震试验研究

Experimental aseismic investigation on a two-story self-centering structure equipped with butterfly-shaped steel plate shear walls

为了研究蝴蝶形钢板剪力墙-自复位结构体系的抗震性能,对7个两层单跨1/2缩尺蝴蝶形钢板的自复位钢框架试件进行了低周反复荷载试验。根据试验结果着重分析了蝴蝶形钢板的高厚比、高宽比和蝴蝶杆层数以及试件的初始预应力等参数对试件的承载力、滞回性能、耗能能力和复位效果等性能的影响。试验结果表明:随着钢板的高厚比和高宽比的减小,试件的承载力和耗能能力增大,但残余变形随着高厚比减小而增加,且几乎不受高宽比的影响;蝴蝶杆层数越多,试件的承载力和残余变形越大,前期耗能越迅速,但最终耗能量相同;初始预应力越大,试件的承载力越大,耗能能力越弱,残余变形越小。

In order to investigate the seismic performance of a self-centering steel frame in-filled with butterfly-shaped steel plate walls, seven one-bay two-story large-scale structure specimens subjected to cyclic loading were tested. Based on the test results, the effects of the height to thickness ratio, height to width ratio of plate walls, the number of butterfly link stories of plate walls and the initial prestress on the load-carrying capacity, hysteretic behavior, energy-dissipation capacity and self-centering ability of specimens were studied. The experimental results show that the load-carrying capacity and energy-dissipation capacity of specimens are augmented with the increase of height to thickness and height to wide ratios of the plates. However, due to the increase of height to thickness ratio of the plates, the residual deformation of specimens increases obviously, while the height to width ratio of the plates has ignorable effect on it.The specimens with two link stories of in-filled plates are of larger load-carrying capacity and greater permanent deformation with an advantage of earlier energy-dissipation behavior of plates, but the final amount of consumed energy is identical. Besides, for those specimens with relatively larger prestress in strands, more robust load-carrying capacity, weaker energy-dissipation behavior and smaller residual deformation are observed.