Characterizing ground motions that collapse steel special moment-resisting frames or make them unrepairable

Earthquake Spectra
By: , and 

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Abstract

This work applies 64,765 simulated seismic ground motions to four models each of 6- or 20-story, steel special moment-resisting frame buildings. We consider two vector intensity measures and categorize the building response as “collapsed,” “unrepairable,” or “repairable.” We then propose regression models to predict the building responses from the intensity measures. The best models for “collapse” or “unrepairable” use peak ground displacement and velocity as intensity measures, and the best models predicting peak interstory drift ratio, given that the frame model is “repairable,” use spectral acceleration and epsilon (ϵ) as intensity measures. The more flexible frame is always more likely than the stiffer frame to “collapse” or be “unrepairable.” A frame with fracture-prone welds is substantially more susceptible to “collapse” or “unrepairable” damage than the equivalent frame with sound welds. The 20-story frames with fracture-prone welds are more vulnerable to P-delta instability and have a much higher probability of collapse than do any of the 6-story frames.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Characterizing ground motions that collapse steel special moment-resisting frames or make them unrepairable
Series title Earthquake Spectra
DOI 10.1193/102612EQS318M
Volume 31
Issue 2
Year Published 2015
Language English
Publisher EERI
Contributing office(s) Geologic Hazards Science Center
Description 28 p.
First page 813
Last page 840