RESEARCH ON DISPLACEMENT-BASED SEISMIC DESIGN METHOD OF REINFORCED CONCRETE FRAME-SHEAR WALL STRUCTURES

According to the characteristic of reinforced concrete frame-shear wall structure,the seismic performance level is divided into three levels: serviceability, life-safety, and collapse prevention. The three levels are qualified with storey drift ratios. Applying the inverted triangular distribution of lateral force to the cantilever column of constant section, and the displaced shape of the column is regarded as the initial mode of lateral displacement. For serviceability, the displaced shape, which storey drift ratio of the floor level at point of contraflexure on the initial mode of lateral displacement is equal to limit of the storey drift ratio, may be seen as target displacement mode. Based on the target displacement mode of frame-shear wall structure in the serviceability performance level, the equivalent parameter can be obtained. Thus, the base shear V_b and horizontal earthquake force F_i at each floor of the building can be determined. Finally, the designed structure is analyzed with nonlinear static analysis method and the design is adjusted by the pushover analysis result until it is satisfied.