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by Sashi Kunnath, Quan Nghiem, Alfred John and Sherif El-Tawil
Kunnath, Sashi, Quan Nghiem, Alfred John and Sherif El-Tawil (2000). Validation of Evaluation Methods and Acceptance Criteria in Evolving Performance-Based Seismic Codes. SMIP2000
Seminar on Utilization of Strong-Motion Data, p. 39 - 64.
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Abstract
A critical evaluation of the four analytical methods recommended in FEMA-273 for the estimation
of seismic demands is carried out using measured response characteristics of four instrumented
steel buildings. Prior to conducting the FEMA-273 analyses, computer models of each structural
system were calibrated to the observed response. Two of the buildings which experienced little
or no damage were modeled as fully three-dimensional systems while the remaining two buildings
which suffered moderate damage in recent seismic events were further tuned to simplified
two-dimensional models to permit detailed inelastic evaluations. Dozens of linear and nonlinear
computer analyses under both static and seismic loads were carried out on each building, however,
only a few typical results are presented in this paper. Results of the
evaluations provide insight into both modeling issues and the validity of the four analytical
procedures outlined in the FEMA-273 document. It is found that calibrating structural models to
observed response is sensitive to mass and stiffness modeling assumptions. Linear and nonlinear
static procedures do not adequately predict inter-story drift estimates, a critical parameter in
seismic evaluation and design.
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