Analytical Study on Collapse-Resisting Capacity of Vertically Irregular Steel Moment Frames

Abstract eng:
The present study investigates the collapse potential of vertical irregular moment-frame system based on the performance based plastic design methodology (PBPD). The well-known method uses the input energy as well as the plastic energy capacity of a building to design the yielding members so that the favorable yield mechanisms reach. Various low-rise to high-rise steel framing are considered as case study. Steel beam–column members of these case studies are proportioned by the plastic energy based method and by the current elastic design method. In order to evaluate the capability of the PBPD to collapse prevention, key structural performance parameters for detailed steel moment framings in terms of maximum/mean inter-story drift ratios, residual drift ratios, and plastic hinge rotations are computed by nonlinear history analysis and then results are compared to the acceptance criteria recommended by the TBI Guidelines as well as the methodology reported in FEMA P695. The comparison show that Performance based plastic design methodology is able to meet collapse margin which is a highest favorable mechanism of the tall vertical geometric irregular building whereas the current code-specified requirements are not practically fully adequate to satisfy the expected seismic behavior of high irregular buildings specifically under the maximum considered earthquake hazard level. In addition, according the controlling criteria reported in TBI, two steel frames that proportioned by the PBPD method, is subjected to a set of ground motions with incremental intensities from maximum considered earthquake hazard level to the early collapse level to estimate a safety margin against lifethreatening collapse. The results exhibit that structural performance for each ground motion favorably shows safe margin against collapse as the maximum IDRs obtained from each records do not exceed 4.5%. In other words, Structural acceptance criteria based on the requirements of TBI Guidelines, for MCE hazard level, in terms of maximum/mean IDRs, RDRs and plastic rotations as local parameters are reasonably satisfied.

Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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 Record created 2017-01-18, last modified 2017-01-18

Original version of the author's contribution as presented on USB, paper 4984.:
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