DESIGN OPTIMIZATION AND SEISMIC ANALYSIS OF SHEAR WALL STRUCTURE BASED ON SHEAR WALL AREA RATIO

Pure shear wall structure has been widely used in Pearl River Delta of China. This paper presented an optimal parameter, shear wall area ratio. A number of residential buildings of pure shear wall structure are investigated, and results show that shear wall area ratios range from 38% to 46% and 32% to 63% for structural arrangements of flats surrounding central lift and arranged along corridor, respectively. The mechanical behavior of 30-story pure shear wall structure under both frequent and rare earthquake action are studied with considering the influence of both shear wall area ratio and structural arrangement. The results indicate that interstory drifts increase while axial compression ratios show uniformed distribution when shear wall area ratios decrease. For structural arrangement of flats surrounding central lift with shear wall area ratio changing from 38.90% to 29.65%, the maximal elastic and inelastic interstory drifts increase by 35.30% and 20.9%, respectively. All members are remained in performance level 1 to 4, and 4% of total amounts of vertical members are improved from performance level 4 to level 3. For structural arrangement of flats arranged along corridor with shear wall area ratio changing from 41.87% to 32.97%, the maximal elastic and inelastic interstory drifts increase by 10.63% and decrease by 10% to 20%, respectively. Meanwhile, 16% of total amounts of shear walls are in performance level 5 and 6 and improved to better performance level.