半刚性框架-无黏结十字加劲钢板剪力墙结构低周往复荷载试验研究

通过对一榀几何比例为1∶3的两层单跨半刚性框架-无黏结十字加劲钢板剪力墙结构在低周往复水平荷载作用下的试验研究，得到了循环荷载下结构的滞回曲线及各关键部位的受力变形情况。分析其承载能力、破坏形式、耗能能力、刚度退化、承载力退化、延性等指标。在此基础上，分析了无黏结十字加劲内嵌钢板与半刚性框架的相互作用。结果表明：该结构具有良好的延性和耗能能力，安全储备高；半刚性框架与内嵌钢板协同工作良好；无黏结加劲构件的设计避免了焊缝的应力集中，降低了钢板墙在加工过程中对工艺的要求；加劲构件的设置改善了钢板墙的受力模式，提高了钢板墙体系的承载力及刚度，减轻了滞回曲线的“捏缩”现象。研究结果可为半刚性框架-无黏结十字加劲钢板剪力墙结构进一步的工程应用和理论研究提供参考。

Cyclic test of unbounded cross-stiffened steel plate shear wall with semi-rigid frame

A one-third scaled, one-bay and two-story experimental specimen of semi-rigid frame with unbounded cross-stiffened steel plate shear wall (SR-UCS-SPSW) was tested under the low-cycle reversed loading to determine its failure mode, hysteretic loops and the deformation situation of key parts of the structure. The hysteretic behavior, rigidity degeneration, strength degradation and ductility have been studied. According to this, in-depth analysis of the interaction between unbounded cross-stiffened steel plate shear wall and the semi-rigid frame was made to evaluate the seismic performance of the structural system. The results show that, the new structure can provide sufficient lateral resistant ability. Its good ductility and energy dissipation capacity shows a good response to seismic action. The cooperation between semi-rigid frame and infilled plate is great. In addition, the semi-rigid connection can simplify the process during construction immensely. The unbounded cross-stiffness avoids the residual stress induced by the conventional weld method, which lowers the requirement of the fabrication quality in the factory. The cross-stiffness improved the performance of steel plate shear wall, i.e. the stiffness and load carring capacity. The shrinkage of the hysteretic loop is significantly reduced. The study may provide a basis for the theoretical analysis and engineering application of this new structural system.