SELF-CENTERING STEEL PLATE SHEAR WALLS FOR IMPROVING SEISMIC RESILIENCE

摘要

As part of a Network for Earthquake Engineering Simulation (NEES) small group research project led by researchers at the University of Washington (UW) with collaborators at University at Buffalo (UB), University of Illinois at Urbana-Champaign (UIUC), and Taiwan National Center for Research on Earthquake Engineering (NCREE), a self-centering steel plate shear wall (SC-SPSW) system has been developed to achieve enhanced performance objectives following earthquakes, including recentering. The SC-SPSW consists of thin steel infill panels, referred to as web plates that serve as the primary lateral load resisting and energy dissipating element of the system. Post-tensioned (PT) beam-to-column connections are employed to provide system recentering capabilities. A performance-based design procedure has been developed for the SC-SPSW, and a series of nonlinear response history analyses have been conducted to verify intended seismic performance at multiple hazard levels. Quasi-static subassembly and scaled three-story tests have been conducted at UW and UB, shake table tests of scaled three-story specimens have been conducted at UB, and pseudo-dynamic tests of two full-scale two-story SC-SPSWs were conducted at NCREE. This research project addressed several key issues in the topic of self-centering and resilient systems, including development of a new PT beam-column connection to eliminate frame expansion, methods of connecting web plates to the boundary frame to mitigate damage, and implementation of PT column base connections to eliminate column hinging and improve structural recentering capabilities. As a culmination of this multi-year, multi-institutional project, this paper will present an overview of the SC-SPSW numerical and experimental research programs. This paper will also discuss innovative PT connection and web plate designs that were investigated to improve constructability, resilience, and seismic performance and that can be applied to other self-centering and steel plate shear wall systems.