钢板剪力墙失效过程与钢板厚度效应

Failure process of steel plate shear walls and thickness effects of the infill steel plate

本文对不同高厚比钢板剪力墙失效破坏过程进行了数值模拟,结果表明钢板剪力墙受力失效过程,包含了钢板整体屈服、分散性局部屈曲、形成拉力带和框架柱出现塑性铰四个特征阶段。虽然降低钢板厚度能够减小拉力带对柱子刚度的要求,却同时也降低了同等层间位移下的钢板剪力墙中钢板的耗能能力。在相同层间位移下,厚钢板剪力墙中钢板耗能更多,其滞回曲线更为饱满。内嵌钢板对框架柱形成的拉压非均匀分布应力是导致柱屈服的关键原因。因此,寻求钢板与柱子刚度之间的优化设计是充分发挥钢板剪力墙结构优点的关键。

The failure process of the SPSW（ steel plate shear wall） structure with variable thickness steel plate is simulated. The result shows that the failure of a SPSW structure generally undergoes four typical state： complete yielding of the infill steel plate,random buckling and of the infill plate,forming the diagonal tension fields,and yielding of the column. So,although a thin infill steel plate can decrease the impact of the diagonal tension on the stiffness demands of columns,it also brings a lower seismic energy consuming performance than a thicker plate of a SPSW structure for the same inter-story drift. After the infill plates yield,for the same inter-story drift,a thicker plate exhibits a more stable hysteresis loops and a higher energy dissipation capacity. The heterogeneous tension and compressive stresses transformed by the infill plate to columns is a significant cause that lead to yielding of column. Thus,it is important to get an optimized design between the thickness of the infill steel plate and the stiffness of columns so that take advantages of the SPSW as one of the lateral resistant systems in building structures.