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Validation of Evaluation Methods and Acceptance Criteria in Evolving Performance-Based Seismic Codes

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.