Drift and rotation demands in steel frames incorporating degradation effects

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Title: Drift and rotation demands in steel frames incorporating degradation effects
Authors: Bravo-Haro, MA
Tsitos, A
Elghazouli, AY
Item Type: Journal Article
Abstract: This paper is concerned with the assessment of seismic drift demands in steel moment frames designed to comply with Eurocode 8 provisions, with due account for cyclic and in-cycle degradation. In addition to degradation effects, the main parameters examined include the ground motion frequency content as well as the level of constant relative strength or inelasticity. To represent a wide range of structural characteristics, a set of 54 multi-storey frames are considered, in which the number of stories, steel profiles, seismic hazard and compliance criteria are varied. Detailed incremental dynamic analyses are performed on the full set of frames using a suite of 56 far-field ground motion records, which are scaled appropriately to achieve different levels of inelastic demand or equivalent behaviour factors. The seismic performance is evaluated in terms of maximum global and local drifts as well as beam chord rotations. Characteristic results show that maximum response in terms of global deformations and inter-storey drifts is significantly affected by degradation phenomena, along with the ground motion frequency content and the level of inelastic demand. For medium rise typologies subjected to earthquakes with relatively high frequency content, concentration of seismic demand in terms of inter-storey drift is captured by the degrading models and leads to early development of plastic mechanisms. The seismic demand scenarios used in this study, through spectral acceleration-based scaling of ground motions, indicate that the influence of degradation can be significant not only at collapse levels but also at those associated with typical design situations. Finally, based on the extensive analyses carried out in this investigation, expressions for predicting the global and local demands are proposed and discussed.
Issue Date: 15-May-2018
Date of Acceptance: 8-May-2018
URI: http://hdl.handle.net/10044/1/59927
DOI: https://doi.org/10.1007/s10518-018-0389-6
ISSN: 1570-761X
Publisher: Springer Verlag
Start Page: 4919
End Page: 4950
Journal / Book Title: Bulletin of Earthquake Engineering
Volume: 16
Issue: 10
Copyright Statement: © Springer Science+Business Media B.V., part of Springer Nature 2018. The final publication is available at Springer via https://link.springer.com/article/10.1007%2Fs10518-018-0389-6
Sponsor/Funder: Commission of the European Communities
Funder's Grant Number: RFSR-CT-2013-00021
Keywords: Science & Technology
Technology
Physical Sciences
Engineering, Geological
Geosciences, Multidisciplinary
Engineering
Geology
Deterioration modelling
Cyclic degradation
Displacement demands
Beam rotations
Eurocode 8
Moment frames
Steel structures
INELASTIC DISPLACEMENT RATIOS
EARTHQUAKE GROUND MOTIONS
SOFT SOIL SITES
MOMENT FRAMES
FREQUENCY CONTENT
SEISMIC DESIGN
EUROCODE 8
STRUCTURAL SYSTEMS
COLLAPSE CAPACITY
STRENGTH
Strategic, Defence & Security Studies
0403 Geology
0905 Civil Engineering
Publication Status: Published
Online Publication Date: 2018-05-15
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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