Aderanssız yumuşak çelik donatının aderanssız ard germeli prefabrik duvar sistemlerinin deprem davranışı üzerindeki etkileri

Seismic energy dissipation of precast concrete lateral force-resisting systems constructed based on non-emulative or jointed connections is very limited since these systems experience little to no damage during seismic events. One of the additional seismic energy dissipation mechanisms for unbonded post-tensioned precast concrete shear walls, which are constructed based on jointed connections, is using unbonded mild steel reinforcement over the wall joints, where joint gap opening occurs under lateral loads. Seismic energy dissipation is achieved by cyclic yielding of unbonded mild steel reinforcement both in tension and compression. Post-tensioned steel tendons are provided to resist lateral forces and minimize permanent drifts under seismic loads. Effects of unbonded mild steel bars on the system energy dissipation capacity and permanent drifts are not documented comprehensively for non-emulative precast concrete lateral force resisting systems. The main objective of this study is to investigate the effects of the mild steel design parameters on the seismic behavior of non-emulative unbonded post-tensioned precast concrete shear wall systems. In this study, a developed numerical finite element (FE) model is verified for a jointed post-tensioned precast concrete shear wall system with experimental data. The experimentally verified modeling approach is used to develop FE models for several 5- story unbonded post-tensioned shear walls to investigate the effects of unbonded mild steel design parameters such as steel amount, location along the joint, and unbonded length on wall lateral behavior including its self-centering, energy dissipation capacity, and permanent prestress force losses for the unbonded tendons. The nonlinear structural behavior of the walls was determined by performing monotonic and cyclic pushover analyses, and nonlinear time history analysis with the OpenSees software. The finding of this study provides new and valuable contributions to the existing literature to further improve the seismic design of non-emulative precast lateral force resisting systems and provide a better understanding of the influence of unbonded mild steel on the seismic performance of jointed precast concrete walls.