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Seismic Performance of Four Instrumented Steel Moment Resisting Frame Buildings during the January 17, 1994 Northridge Earthquake

by Farzad Naeim, Roy Lobo, Konstantinos Skliros and Marcello Sgambelluri

Naeim, Farzad, Roy Lobo, Konstantinos Skliros and Marcello Sgambelluri (1999). Seismic Performance of Four Instrumented Steel Moment Resisting Frame Buildings during the January 17, 1994 Northridge Earthquake. SMIP99 Seminar on Utilization of Strong-Motion Data, p. 51 - 82.

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Abstract

This paper presents a summary of our comprehensive evaluation of the seismic performance of four instrumented steel moment resisting frame buildings during the 1994 Northridge earthquake. The buildings were inspected and repaired, where necessary, according to the requirements of he FEMA-267 Interim Guidelines [FEMA, 19951. The basic premise of performance based seismic engineering is the ability to predict performance given the base earthquake ground motion and building characteristics. These four buildings provided a perfect vehicle to compare the current status of analytical abilities versus this basic requirement for achieving a meaningful performance based design. To this end, not only we developed and studied numerous linear and nonlinear, static and dynamic computer models of these buildings, but we evaluated the relevant provisions of the leading traditional as well as performance based codes and standards. As this paper indicates, we are not far from the ability to understand, model, and explain global performance of structures. However, we are farther away from accurate prediction of location and extent of local damages within a structure. It is hoped that future work by us and other researchers will remedy this shortcoming in the near future.