Inelastic analyses of a 17-story steel framed building damaged during Northridge

A series of two- and three-dimensional static and dynamic inelastic frame analyses are performed for a 17-story steel moment frame building damaged by the 1994 Northridge earthquake. The primary objectives of the study are to: (1) exercise state-of-the-art inelastic static and dynamic analyses for t...

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Bibliographic Details
Published in:Engineering structures 1998-04, Vol.20 (4), p.481-495
Main Authors: Chi, Wei-Ming, El-Tawil, Sherif, Deierlein, Gregory G., Abel, John F.
Format: Article
Language:English
Subjects:
Applied sciences
building
Building structure
Buildings. Public works
connections
Construction (buildings and works)
dynamic analysis
Earth sciences
Earth, ocean, space
earthquake
Earthquakes, seismology
Exact sciences and technology
fracture
High rise structure
inelastic analysis
Internal geophysics
seismic
steel frame
Stresses. Safety
Structural analysis. Stresses
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Summary:A series of two- and three-dimensional static and dynamic inelastic frame analyses are performed for a 17-story steel moment frame building damaged by the 1994 Northridge earthquake. The primary objectives of the study are to: (1) exercise state-of-the-art inelastic static and dynamic analyses for the evaluation and design of steel buildings; (2) establish to what degree frame analyses can be used to predict the types of brittle connection damage that occurred during the Northridge earthquake; and (3) investigate the reliability of the analyses and the influence of modeling parameters on computed performance indices. In general, this study shows that calculated interstory drift ratios and curvature demands obtained from inelastic time history analyses correlate reasonably well with the pattern of connection damage observed in the building. However, there is significant scatter in the computed deformation demands that are strongly dependent on the degree to which three-dimensional torsion, secondary structural elements and strength/stiffness degradation (associated with connection fractures) are modeled in the analyses. Further, comparisons of static and dynamic analyses indicate that for this building static pushover analyses do not capture higher vibration modes that are significant.
ISSN:0141-0296
1873-7323
DOI:10.1016/S0141-0296(97)00036-9