Quanti cation of Building Seismic Performance Factors: Component Equivalency Methodo

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Quanti cation of Building Seismic Performance Factors: Component Equivalency Methodology

Author: FEMA P-795 | Size: 12.6 MB | Format: PDF | Quality: Unspecified | Publisher: FEDERAL EMERGENCY MANAGEMENT AGENCY Michael Mahoney, Project Officer Robert D. Hanson, Technical Monitor Washington, D.C. ATC MANAGEMENT AND OVERSIGHT Christopher Rojahn (Project Executive) William T. Holmes (Project Technical Monitor) Jon A. Heintz (Project Quality Control Monitor) Ayse Hortacsu (Project Manager) | Year: june 2011 | pages: 292

The Federal Emergency Management Agency (FEMA) has the goal of
reducing the ever-increasing cost that disasters inflict on our country.
Preventing losses before they happen by designing and building to withstand
anticipated forces from these hazards is one of the key components of
mitigation, and is the only truly effective way of reducing the cost of
disasters.
As part of its responsibilities under the National Earthquake Hazards
Reduction Program (NEHRP), and in accordance with the National
Earthquake Hazards Reduction Act of 1977 (PL 94-125) as amended, FEMA
is charged with supporting activities necessary to improve technical quality
in the field of earthquake engineering. The primary method of addressing
this charge has been supporting the investigation of seismic and related
multi-hazard technical issues as they are identified by FEMA, the
development and publication of technical design and construction guidance
products, the dissemination of these products, and support of training and
related outreach efforts. These voluntary resource guidance products present
criteria for the design, construction, upgrade, and function of buildings
subject to earthquake ground motions in order to minimize the hazard to life
in all buildings and increase the expected performance of critical and higher
occupancy structures.
This publication builds upon an earlier FEMA publication, FEMA P-695
Quantification of Building Seismic Performance Factors (FEMA, 2009b).
FEMA P-695 presents a procedural methodology for reliably quantifying
seismic performance factors, including the response modification
coefficient, R, the system overstrength factor, ΩO, and the deflection
amplification factor, Cd, used to characterize the global seismic response of a
system.
While the methodology contained in FEMA P-695 provides a means to
evaluate complete seismic-force-resisting systems proposed for adoption into
building codes, a component-based methodology was needed to reliably
evaluate structural elements, connections, or subassemblies proposed as
substitutes for equivalent components in established seismic-force-resisting
systems. The Component Equivalency Methodology presented in this
document fills this need by maintaining consistency with the probabilistic,

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