Performance-Based Engineering of Core Wall Tall Buildings: Fid-Bau Portal

Performance-Based Engineering of Core Wall Tall Buildings

Sarkisian, M. / Long, E. / Hassan, W.

Performance-based engineering of tall buildings in regions of high seismicity is becoming an increasingly popular design methodology. However, the current state of knowledge and practice in nonlinear modeling and performance-based design of this type of buildings is not growing fast enough to meet the profession's needs. Many nonlinear modeling parameters in core wall tall buildings are controversial in the professional community and are still undergoing extensive academic research. This paper summarizes the current state of knowledge and best practices of core wall tall building seismic engineering from the perspective of the nonlinear, performance-based design of a 30-story, concrete core-wall-only office tower located in downtown San Francisco. The tower consists of a cast-in-place center concrete shear wall core and perimeter gravity columns connected with a 14-in.-thick, void-formed post-tensioned concrete diaphragm. The nonlinear model features a fiber element core wall along with shear displacement hinged link beams and explicitly models the ground floor and basement level slabs. Inelastic gravity columns and floor diaphragm components are included to detect any nonlinearity and incorporate its effects. A suite of 10 pairs of maximum considered earthquake (MCE) ground motion records is used to evaluate building performance. The nonlinear response of the 10 ground motion analysis is highlighted. The paper also presents results of parametric studies that highlight the effect of some of the critical nonlinear modeling parameters on the performance of core wall tall buildings undergoing inelastic deformations. These parameters include the combinations of modal and Rayleigh damping, link beam modeling properties, and podium diaphragm effects. Based on the results of the performed parametric studies, best modeling practices are suggested.