Abstract
An estimation method of lateral distribution of repuired strength for preventing torsional vibration in irregular-shaped buildings is proposed. In this method, elastic torsional response properties are considered. Inelastic torsional earthquake response analyses are carried out for some irregular-shaped structures to investigate effectiveness of this method. Following results are obtained by this method: (1) distribution of ductility factor at each frame becomes uniform, (2) strength modification factor in terms of eccentricity in the present Japanese design standard can be lower, (3) distribution of large strength at high-rise part and small strength at low-rise part is appropriate in setback-type buildings.
