As part of the NSF-supported NEES research project (CMMI 0830294) NEESR: Smart and Resilient Steel Plate Shear Walls headed by PI Jeffrey Berman and co-PIs Laura Lowes (University of Washington), Michel Bruneau (University of Buffalo, SUNY) and Larry Fahnestock (University of Illinois), the project team recently completed large-scale testing in the NEES@Illinois MUST-SIM facility at the University of Illinois at Urbana-Champaign. Testing on the FLEX and INT specimens has been completed. Additional information regarding the project can be found on the NEEShub (see below).
The steel plate shear wall (SPSW) system is a seismic lateral force resisting system that has demonstrated good stiffness, strength, ductility and energy dissipation capacity. The SPSW with coupling (SPSW-WC) configuration, which links two adjacent SPSW piers using coupling beams, retains the benefits of the traditional SPSW system while increasing architectural flexibility, material efficiency and energy dissipation. Although the SPSW-WC is a promising form of the SPSW system, a thorough investigation is required to facilitate code implementation for use in regions of high seismic hazard. The objective of this project is to conduct a comprehensive study of the SPSW-WC configuration to identify critical attributes of structural behavior and to develop a design framework that ensures robust seismic performance. The upcoming tests evaluate the lower three stories of a six-story building, and the Load and Boundary Condition Boxes (LBCBs) will impose demands that represent the effects of the upper three stories throughout the increasing amplitude cyclic lateral loading protocol. The two test specimens are distinguished by different degrees of coupling. The first specimen is more lightly coupled and has coupling beams that yield in flexure, whereas the second specimen is more heavily coupled and has coupling beams that yield in combined flexure and shear. Both specimens are expected to provide significant ductility and energy dissipation through web plate tension field action and horizontal boundary element and coupling beam hinging. The experimental results will be used to validate the companion analytical and numerical studies and finalize design recommendations for the SPSW-WC configuration.
September 6, 2013