Performance Prediction and Evaluation of Steel Special Moment Frames for Seismic Loads
Lee, Kihak
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https://hdl.handle.net/2142/83521
Description
Title
Performance Prediction and Evaluation of Steel Special Moment Frames for Seismic Loads
Author(s)
Lee, Kihak
Issue Date
2000
Doctoral Committee Chair(s)
Foutch, Douglas A.
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Language
eng
Abstract
Several classes of post-Northridge buildings, which are representative of typical buildings designed by the 1997 NEHRP provisions and constructed using pre-qualified ductile connections, were developed considering different heights, locations, and soil types. Then, the frame analysis models were made including the effect of post-Northridge ductile connection, panel zone deformation and interior gravity frames. The 1973 UBC, 1985 UBC and 1994 UBC provisions were selected for the pre-Northridge 3-, 9- and 20-story buildings in Los Angeles and Seattle and designed for wind and seismic loads. A total of 15 pre-Northridge buildings, which are representative of typical buildings based on year of construction and brittle pre-Northridge connections, were designed considering different height, locations and year of construction. Then, the frame analysis models were made including the effect of post- and pre-Northridge connection, panel zone deformation and interior gravity frames. The seismic demands and capacities were calculated using each set of 20 SAC ground motions representing 2/50 and 50/50 hazard levels. Using the drift demands and capacities, the performance prediction and evaluation procedure based on the reliability framework for SMRF buildings is presented. The randomness and uncertainty associated with predicting the capacity and demand are explicitly accounted for this method. Confidence levels that existing buildings will exceed the pre-defined performance level against different hazard levels are calculated based on the Collapse Prevention (CP) and Immediate Occupancy (IO) performance levels.
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