Influence of deterioration modelling on the seismic response of steel moment frames designed to Eurocode 8

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Title: Influence of deterioration modelling on the seismic response of steel moment frames designed to Eurocode 8
Authors: Tsitos, A
Bravo-Haro, MA
Elghazouli, AY
Item Type: Journal Article
Abstract: This paper assesses the influence of cyclic and in-cycle degradation on seismic drift demands in moment-resisting steel frames (MRF) designed to Eurocode 8. The structural characteristics, ground motion frequency content, and level of inelasticity are the primary parameters considered. A set of single-degree-of-freedom (SDOF) systems, subjected to varying levels of inelastic demands, is initially investigated followed by an extensive study on multi-storey frames. The latter comprises a large number of incremental dynamic analyses (IDA) on 12 frames modelled with or without consideration of degradation effects. A suite of 56 far-field ground motion records, appropriately scaled to simulate 4 levels of inelastic demand, is employed for the IDA. Characteristic results from a detailed parametric investigation show that maximum response in terms of global and inter-storey drifts is notably affected by degradation phenomena, in addition to the earthquake frequency content and the scaled inelastic demands. Consistently, both SDOF and frame systems with fundamental periods shorter than the mean period of ground motion can experience higher lateral strength demands and seismic drifts than those of non-degrading counterparts in the same period range. Also, degrading multi-storey frames can exhibit distinctly different plastic mechanisms with concentration of drifts at lower levels. Importantly, degrading systems might reach a "near-collapse" limit state at ductility demand levels comparable to or lower than the assumed design behaviour factor, a result with direct consequences on optimised design situations where over-strength would be minimal. Finally, the implications of the findings with respect to design-level limit states are discussed.
Issue Date: 2-Jan-2018
Date of Acceptance: 30-Jul-2017
ISSN: 0098-8847
Publisher: Wiley
Start Page: 356
End Page: 376
Journal / Book Title: Earthquake Engineering and Structural Dynamics
Volume: 47
Issue: 2
Copyright Statement: This is the peer reviewed version of the following article: Tsitos A, Bravo-Haro MA, Elghazouli AY. Influence of deterioration modelling on the seismic response of steel moment frames designed to Eurocode 8. Earthquake Engng Struct Dyn. 2017;1-20, which has been published in final form at This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Sponsor/Funder: Commission of the European Communities
Funder's Grant Number: RFSR-CT-2013-00021
Keywords: 0905 Civil Engineering
Strategic, Defence & Security Studies
Publication Status: Published online
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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