Seismic behavior of steel buildings with out-of-plumb

Summary A structure that has a permanent offset from a true vertical line is commonly referred to as being ‘out‐of‐plumb’. Out‐of‐plumb may result from construction tolerances or post‐earthquake permanent deformations in steel buildings. This paper quantifies the displacements of buildings with out‐...

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Bibliographic Details
Published in:Earthquake engineering & structural dynamics 2015-11, Vol.44 (14), p.2575-2588
Main Authors: Rad, Ali A., MacRae, Gregory A., Yeow, Trevor Z., Bull, Desmond K.
Format: Article
Language:English
Subjects:
Aseismic buildings
Buildings
Design engineering
Design factors
Drift
Dynamics
out-of-plumb
peak and residual inter-story drift
Seismic phenomena
Structural steels
time history analysis
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Summary:Summary A structure that has a permanent offset from a true vertical line is commonly referred to as being ‘out‐of‐plumb’. Out‐of‐plumb may result from construction tolerances or post‐earthquake permanent deformations in steel buildings. This paper quantifies the displacements of buildings with out‐of‐plumb in subsequent seismic events by means of inelastic dynamic time history analysis. Structures considered have different structural heights, force design reduction factors (R), and target inter‐story drifts. It is shown that buildings with greater out of plumb and force design reduction factor have larger normalized peak inter‐story drift ratio and ratio of residual‐to‐peak drift. Also, the ratio of residual‐to‐peak drift was not strongly dependent on structural height or design drift. A design procedure and example provided, based on the results obtained, show how peak and residual inter‐story drift ratio can be estimated. Copyright © 2015 John Wiley & Sons, Ltd.
ISSN:0098-8847
1096-9845
DOI:10.1002/eqe.2598