钢板剪力墙低周反复荷载试验研究

本文进行了6个13比例钢板剪力墙的低周反复荷载试验,重点研究了钢板墙极限承载力和滞回性能,为钢板墙结构利用屈曲后强度及抗震设计提供试验依据;本试验揭示了边柱局部屈曲、加劲肋布置形式、加劲板刚度和板高厚比对钢板墙滞回性能的影响。试验结果表明,边柱不出现局部屈曲是钢板墙发挥极限承载力的重要保证;厚板和较强的加劲肋对提高钢板墙滞回曲线的饱满度和滞回环面积是有利的;三种钢板墙以交叉加劲板的承载力和滞回性能最佳,十字加劲板次之,钢板墙结构耗能能力依赖于钢板与边柱的弹塑性变形和钢板面外鼓曲变形。试验曲线与应用弹塑性大挠度有限元法计算的滞回曲线吻合良好;利用屈曲后强度的钢板墙受剪承载力,其试验值与本课题建议公式及有限元值计算结果基本一致。

Cyclic test of steel plate shear walls

Six steel plate shear wall (SPSW) specimens with and without stiffeners had been tested under low cyclic loading to determine the hysteretic behavior and ultimate load carrying capacity utilizing post buckling strength. Test showed that the specimens behaved four main characteristics, including flanges and web local buckling of column, stiffeners distribution type, panel slenderness ratio and stiffness ratio of stiffener to panel, that affected the panel wall. Based on the experimental test, some important conclusions had been drawn in regard to the failure mechanics, energy dissipation, hysteresis loop characteristics of steel plate shear wall and distribution of internal forces of column. The stability of flanges and web in columns guaranteed the development of post buckling strength of SPSW, and thicker panel and stronger stiffeners gave rise to higher hysteretic behavior. The test also showed that energy dissipation was due to the material plasticity developed and the large out of plane deformation of the panel resulting in excellent hysteretic behavior in diagonally stiffened SPSW than cross stiffened and unstiffened SPSW. Hysteresis loops obtained from elastic plastic large displacement FE method showed great coincident with those from test and the values of shear carrying capacity of SPSW specimens utilizing post buckling strength agreed very well with those obtained from FEM and formulae proposed in SPSW research subject.