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Dynamic Analysis of a 13-Story Steel Frame Building Instrumented and Damaged in the 1994 Northridge Earthquake

by Chia-Ming Uang, Qi-song Yu, Ali Sadre, David Bonowitz and Nablh Youssef

Uang, Chia-Ming, Qi-song Yu, Ali Sadre, David Bonowitz and Nablh Youssef (1995). Dynamic Analysis of a 13-Story Steel Frame Building Instrumented and Damaged in the 1994 Northridge Earthquake. SMIP95 Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 93 - 105.

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Abstract

This case study is for an instrumented thirteen-story steel moment frame (SMF) building located near the epicenter, which sustained damage to its welded connections during the 1994 Northridge earthquake. The building, which was instrumented on three floors, had been surveyed and data was collected on the fractured joints. One objective of this study was to verify the accuracy of present analytical tools in predicting the extent and severity of connection failures. Elastic time-history analysis showed good correlation with the measured response in E-W direction. In the other direction with strong ground shaking, panel zones had to be modeled in the inelastic time-history analysis in order to achieve good correlation. The inelastic analysis indicated that panel zones must have been a major source of energy dissipation during the Northridge earthquake. From this study, it appears that current analytical tools for both elastic and inelastic analyses can be instrumental in predicting the intensity and pattern of the expected damage during severe seismic events.