Composite Plate Shear Wall / Concrete Filled (C-PSW/CF), also known as the SpeedCore system, is an efficient seismic force-resisting system for buildings. Two types of C-PSW/CF systems are possible: coupled and uncoupled. Seismic design requirements for uncoupled C-PSW/CF systems were addressed in ASCE/SEI 7-16 and AISC 341-16, Section H7. Coupled C-PSW/CF systems are more ductile and have more redundancy than uncoupled systems, but ASCE/SEI 7-16 did not assign seismic design factors in Table 12.2-1. A FEMA P695 study was conducted to verify the design factors that should be used for such Coupled C-PSW/CF structures. Adding this as a separate category in Table 12.2-1 was important because they can be used as the elevator core wall systems in modern high-rise buildings. Two line items featuring this system are now added to ASCE/SEI 7-22 Table 12.2-1 under Building Frame Systems and Dual Systems with Special Moment Frames. R = 8, Cd = 5.5, and Ω0 = 2.5 are the design factors in both line items. The height limits are the same as for corresponding uncoupled isolated wall systems.
A definition for the Coupled C-PSW/SF system and its design and detailing requirements were not included in AISC 360-16 or AISC 341-16. A new Section H8 in AISC 341-22 includes specific provisions for the definition and use of this Coupled C-PSW/CF system, including details on the capacity design principle limits on applicability. This presentation outlines the above developments and presents a detailed design example illustrating the Coupled-C-PSW/CF seismic force-resisting system.
Learning objectives:
Innovative Solutions for the Built EnvironmentEstablished by the United States Congress, NIBS' mission is to serve the public interest by advancing building science and technology to improve the built environment.Terms and Conditions© 2024 National Institute of Building Sciences.All rights reserved.