Ganjavi, B., Hao, H. and Hajirasouliha, I. (2016) Influence of Higher Modes on Strength and Ductility Demands of Soil-Structure Systems. Journal of Earthquake and Tsunami, 10 (4). 1650006. ISSN 1793-4311
Abstract
Due to the inherent complexity, the common approach in analysing nonlinear response of structures with soil-structure interaction (SSI) in current seismic provisions is based on equivalent SDOF systems (E-SDOF). This paper aims to study the influence of higher modes on the seismic response of SSI systems by performing intensive parametric analyses on more than 6400 linear and non-linear MDOF and E-SDOF systems subjected to 21 earthquake records. An established soil-shallow foundation-structure model with equivalent linear soil behaviour and nonlinear superstructure has been utilized using the concept of cone models. The lateral strength and ductility demands of MDOF soil-structure systems with different number of stories, structure-to-soil stiffness ratio, aspect ratio and level of inelasticity are compared to those of ESDOF systems. The results indicate that using the common E-SDOF soil-structure systems for estimating the strength and ductility demands of medium and slender MDOF structures can lead to very un-conservative results when SSI effect is significant. This implies the significance of higher mode effects for soil-structure systems in comparison with fixed-based structures, which is more pronounced for the cases of elastic and low level of inelasticity.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 World Scientific Publishing Co Pte Ltd. This is an author produced version of a paper subsequently published in Journal of Earthquake and Tsunami. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Soil-structure interaction; equivalent SDOF; MDOF systems; seismic strength demand; ductility demand; higher modes effect |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Civil and Structural Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 27 Jan 2016 15:44 |
Last Modified: | 04 Feb 2017 01:38 |
Published Version: | http://dx.doi.org/10.1142/S1793431116500068 |
Status: | Published |
Publisher: | World Scientific Publishing |
Refereed: | Yes |
Identification Number: | 10.1142/S1793431116500068 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:94170 |