框架-新型带缝钢板剪力墙抗震性能数值分析

Numerical analysis on seismic behavior of frame-novel steel plate shear wall with slits

蝶形和梭形两种不等高开缝形式的钢板剪力墙可以在提高墙板刚度和极限承载力的同时,保证其耗能性能不降低。本文将这两种新型带缝钢板剪力墙应用于钢框架结构中,采用数值模拟的方法对其滞回性能及耗能性能进行研究,并与内嵌传统等高开缝钢板剪力墙的框架结构进行对比分析。将壁式框架等代模型用于模拟不等高开缝钢板剪力墙受力特性,并将计算结果与ABAQUS壳单元计算结果进行对比。结果表明:相对于传统开缝钢板剪力墙而言,内嵌新型开缝钢板的框架结构的抗侧刚度和极限承载力均有显著提高,且具有良好的耗能性能;柱轴心压力对结构刚度影响不大,且对承载力的影响能控制在20%以内,对耗能性能影响不大,只是导致结构提前丧失工作能力;壁式框架等代模型可以较准确地模拟不等高开缝钢板剪力墙的受力特性。

Two kinds of steel plate shear wall with unequal length slit, called 'Butterfly' and 'Fusiform' can increase the stiffness and ultimate bearing capacity of wall without the dissipation capacity of shear wall reducing. This paper introduced these two kinds of steel slits wall into frame structure. Hysteretic behavior and energy dissipation capacity of steel slit wall were analyzed numerically and the results were compared with the frame-traditional steel plate shear wall with slits structure. Then, the wall frame simplified analytical model was applied to simulate the steel wall with unequal slits. The results were calibrated against the finite element model using shell elements. The results show that comparing with frame-traditional steel slits wall, the frame structure with new steel slits wall has higher initial stiffness and higher ultimate bearing capacity. Axial force of column has little effect on the stiffness of the structure and the effect on bearing capacity can be controlled within 20%. Axial force of column also has little effect on energy dissipation capacity, but with the increasing of axial force of column, the structure loses bearing capacity earlier and earlier. Wall frame simplified analytical model can simulate steel wall with the unequal slit accurately.