Quantification of Building Seismic Performance Factors

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This report describes a recommended methodology for reliably quantifying building system performance and response parameters for use in seismic design. The recommended methodology (referred to herein as the Methodology) provides a rational basis for establishing global seismic performance factors (SPFs), including the response modification coefficient (R factor), the system overstrength factor (), and deflection amplification factor (Cd), of new seismic-force-resisting systems proposed for inclusion in model building codes.
The purpose of this Methodology is to provide a rational basis for determining building seismic performance factors that, when properly implemented in the seismic design process, will result in equivalent safety against collapse in an earthquake, comparable to the inherent safety against collapse intended by current seismic codes, for buildings with different seismic-force-resisting systems.
As developed, the following key principles outline the scope and basis of the Methodology:
 It is applicable to new building structural systems.
 It is compatible with the NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures (FEMA, 2004a) and ASCE/SEI 7, Minimum Design Loads for Buildings and Other Structures, (ASCE, 2006a).
 It is consistent with a basic life safety performance objective inherent in current seismic codes and standards.
 Earthquake hazard is based on Maximum Considered Earthquake ground motions.
 Concepts are consistent with seismic performance factor definitions in current seismic codes and standards.
 Safety is expressed in terms of a collapse margin ratio.
 Performance is quantified through nonlinear collapse simulation on a set of archetype models.
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Quantification of Building Seismic Performance Factors
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