Abstract
Wall-type precast reinforced concrete (WPC) residential buildings were widely constructed in Japan since the middle of the 1960s. A large number of these types of buildings still exit, and maintain high structural quality; however, their residential units are rather small and are extremely standardized, which do not suit modern living use. In order to create new openings in existing WPC walls to widen possibilities for plan changes during renovations, the authors conducted experiments of half-scale WPC shear walls with new openings and reinforcement. In addition, inelastic static pushover analysis models were created, that can reasonably simulate the shear wall behavior. In this paper, the analytical models are developed for full-scale, standard WPC residential buildings to evaluate the collapse mechanism and ultimate lateral strength. Through the static pushover analyses, the ultimate seismic strength (base-shear) coefficient is determined to be approximately 0.6 and rocking of the shear walls accompanied with failure of the connecting reinforcement at the first floor is the primary mechanism. Furthermore, in some analysis models with new openings in the shear walls, the influence on the ultimate lateral strength and failure mechanism is limited.
