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.
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