增强钢剪切板的周期性能、变形能力及刚度分析

Cyclic Behaviour, Deformability and Rigidity of Stiffened Steel Shear Panels

剪切板在提高结构的抗震性能方面起了重要的作用,它们一般出现在薄钢板剪力墙或在偏心支撑框架结构的连接梁腹板处。剪切板的后期压曲能力、变形能力、能量损耗现在已经广泛地被结构工程师接受并在设计中考虑,以获得更经济的设计结果。通过对加强板和未加强板的对比可知,未加强板更易延展,而加强钢板具有很强的屈服区间,故导致了很高的能量损耗。鉴于这两种极端的情况,剪切板的最大延展性和能量消耗响应不可能同时拥有。在数值分析中对增强剪力板的极限强度的效果进行了分析,并研究了加强和未加强剪力板的循环性能。最后,对未加强板滞回曲线中较小的范围,研究了最佳增强效果需要提供的合理能量损耗和延展性。

Shear panels play an important role in improving the seismic behaviour of structures. They generally occur as thin steel plate shear walls （TSPSW） or shear panels created within the web of link beams in eccentrically braced frame （EBF） structures. The post-buckling capacity, deformability and energy dissipation of shear panels are now widely accepted by structural engineers and has resulted in more economical designs. Comparing the behaviour of unstiffened panels with that of heavily stiffened panels shows that unstiffened panels provide a more ductile response while heavily stiffened panels have a wider yield area, which in turn results in higher energy dissipation. Considering these two extreme cases, simultaneous maximum ductility and energy dissipation response cannot be expected. In this numerical research the effect of stiffening upon the ultimate strength of shear panels is investigated. Then, the cyclic behaviour of stiffened and unstiffened shear panels is studied. Finally, with regard to the smaller areas contained within the hysteretic loops of unstiffened panels （due to their pinching records）, the optimal stiffening needed to provide both the desirable energy dissipation and ductility is investigated.