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Concurrent effects of inertial and kinematic soil-structure interactions on strength-ductility-period relationship

Concurrent effects of inertial and kinematic soil-structure interactions on strength-ductility-period relationship
Concurrent effects of inertial and kinematic soil-structure interactions on strength-ductility-period relationship

As a key stage of performance-based seismic design of structures, strength-ductility-period relationship is used to determine either inelastic strength or ductility ratio of the structure with a specific fundamental vibration period. On the other hand, period, strength, and ductility demands of structures are significantly affected by inertial and kinematic soil-structure interactions. Hence, this study addresses strength-ductility-period relationship of structures with embedded foundations subjected to non-pulse earthquakes. To achieve this goal, a soil-foundation-structure interaction system well suited for parametric study was used: the soil beneath the rigid foundation was considered as a half-space, the foundation was modelled using a stack of discretised embedded disks, and the structure was modelled as an equivalent single-degree-of-freedom oscillator. A number of soil-foundation-structure interaction systems defined according to key interaction dimensionless parameters were analysed subjected to a suit of 40 non-pulse ground motions. The results show that ductility ratio spectra are significantly influenced by inertial and kinematic interaction effects. It is also found that equal displacement rule can be either valid or invalid under different soil-foundation-structure interaction effects. Further, a practice-oriented mathematical expression was recommended for ductility ratio of soil-foundation-structure interaction systems, which can find use in performance evaluation of existing structures with embedded foundation.

Ductility ratio, Equal displacement rule, Kinematic and inertial interactions, Strength reduction factor, Structures with embedded foundations
0267-7261
174-189
Ahmadi, Ehsan
f1994ae0-2b3e-43c9-a595-032e801aae70
Ahmadi, Ehsan
f1994ae0-2b3e-43c9-a595-032e801aae70

Ahmadi, Ehsan (2019) Concurrent effects of inertial and kinematic soil-structure interactions on strength-ductility-period relationship. Soil Dynamics and Earthquake Engineering, 117, 174-189. (doi:10.1016/j.soildyn.2018.10.043).

Record type: Article

Abstract

As a key stage of performance-based seismic design of structures, strength-ductility-period relationship is used to determine either inelastic strength or ductility ratio of the structure with a specific fundamental vibration period. On the other hand, period, strength, and ductility demands of structures are significantly affected by inertial and kinematic soil-structure interactions. Hence, this study addresses strength-ductility-period relationship of structures with embedded foundations subjected to non-pulse earthquakes. To achieve this goal, a soil-foundation-structure interaction system well suited for parametric study was used: the soil beneath the rigid foundation was considered as a half-space, the foundation was modelled using a stack of discretised embedded disks, and the structure was modelled as an equivalent single-degree-of-freedom oscillator. A number of soil-foundation-structure interaction systems defined according to key interaction dimensionless parameters were analysed subjected to a suit of 40 non-pulse ground motions. The results show that ductility ratio spectra are significantly influenced by inertial and kinematic interaction effects. It is also found that equal displacement rule can be either valid or invalid under different soil-foundation-structure interaction effects. Further, a practice-oriented mathematical expression was recommended for ductility ratio of soil-foundation-structure interaction systems, which can find use in performance evaluation of existing structures with embedded foundation.

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More information

Accepted/In Press date: 31 October 2018
e-pub ahead of print date: 7 December 2018
Published date: 1 February 2019
Keywords: Ductility ratio, Equal displacement rule, Kinematic and inertial interactions, Strength reduction factor, Structures with embedded foundations

Identifiers

Local EPrints ID: 428985
URI: https://eprints.soton.ac.uk/id/eprint/428985
ISSN: 0267-7261
PURE UUID: 870d9a57-a59a-4a27-9b54-115aec2c37fd

Catalogue record

Date deposited: 15 Mar 2019 17:30
Last modified: 15 Mar 2019 17:30

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