开缝钢板剪力墙滞回性能研究

Research on the Hysteretic Behavior of Steel Plate Shear Wall with Slits

开缝钢板剪力墙的开缝形式能够改善结构破坏形式、提高耗能能力及延性。为研究不同开缝形式和开缝参数对开缝钢板剪力墙的滞回性能影响,利用ABAQUS有限元软件建立了开缝钢板剪力墙的数值模型。结果表明,有限元计算结果和试验结果吻合较好。设计了竖缝、斜缝和对称斜缝3种开缝形式,通过28个钢板剪力墙试件的计算分析发现开缝钢板墙能够很好地实现屈曲前屈服。开缝使得钢板墙的承载力和刚度明显下降,但滞回环饱满,具有较好的耗能性能;而对称斜缝钢板墙可获得较好的屈服耗能。研究结果表明:缝间墙肢宽高比为0.2时的钢板墙刚度和耗能性能较好;通过合理设置钢板墙中的开缝参数,可使得钢板墙具有可控的抗侧刚度和承载力,获得较好的抗震耗能能力。通过骨架曲线上的特征点对开缝钢板墙的受力过程进行分析,考察了缝间墙肢宽高比b/h和高厚比h/t对开缝钢板墙滞回性能的影响。

Slits on steel plate shear wall（ SPSW） can improve the failure modes of structural members and enhance the ductility and energy-dissipating capacity,etc. To study the hysteretic behavior of steel plate shear wall（ SPSW） with different slit types,a finite element model（ FEM） is built using the software ABAQUS. A good agreement is found between the experimental results and predictions from the FE models. Three types of slits,namely vertical slits,inclined slits,and mirror symmetric inclined slits,are designed,and 28 models of SPSW with different slit types are analyzed. It was found that SPSW with slits yield before buckling,and both the bearing capacity and rigidity of the steel plate wall drop obviously with slits,but the circles of hysteretic loop are larger than that of normal SPSW,which indicates better energy dissipation capacity. Especially,good yielding energydissipating capacity of steel strips is found for the specimens with mirror symmetric inclined slits. The results show that the rigidity and energy dissipation can reach a relatively good value,when the width-height ratio of steel strips between slits is 0.2. If the slit parameters in SPSW are designed properly,the governable lateral stiffness,bearing capacity and energy dissipation can be achieved. The stress distribution of typical SPSW specimen with slits is analyzed at several characteristic points on the skeleton curve,and the ratio of b/h and h/t on hysteretic behavior of specimens are investigated.