Capacity-Demand Index Relationships for Seismic Design

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Seismic design procedures in current building provisions are based on linear and nonlinear static approaches that use capacity-demand index relationships such as the relationship between the lateral strength and the maximum lateral displacement. Previous research on the development of these relationships is based on linear-elastic ground motion acceleration response spectra, whereas the current design procedures are based on "smooth" design response spectra. For the design procedures to be consistent, new capacity-demand index relationships are proposed based on smooth design response spectra from existing design provisions. This book provides procedures that utilize these capacity-demand index relationships for the purpose of producing viable structural designs using performance-based engineering concepts (e.g., inelastic capacity-demand spectra methods). The tools herein summarize the basic understanding of seismic design essential for any practicing structural engineer.

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