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Nonlinear dynamics of self-centring rocking steel frames using finite element models

Nonlinear dynamics of self-centring rocking steel frames using finite element models
Nonlinear dynamics of self-centring rocking steel frames using finite element models
Rocking post-tensioned steel frames capitalise on the use of rocking joints, and unbonded post-tensioning strands to provide self-centring action. Investigations on the complex and unconventional nonlinear dynamics of tied rocking steel frames, exclusive of supplemental damping methods, are presently limited. Increasing levels of energy-dissipation reduce the probability of observing nonlinear dynamic phenomena such as co-existing (high/low) amplitude responses at and around the system's nonlinear resonance. To this end, a finite element (FE) modelling framework is presented, validated and extended to multi-storey steel buildings. It is shown that the simulation strategies proposed enable an accurate representation of the complex nonlinear dynamics of self-centring structures, over a wide range of excitation frequencies and amplitudes. The methodology, applied to multi-storey steel frames, captures the presence of sub-harmonic resonances and higher-modes. It is also demonstrated that the additional demands observed in the rocking columns are the consequence of the asymmetry of the member boundary conditions.
Finite-element, Nonlinear dynamics, Post-tensioned moment frame, Rocking, Self-centring
0267-7261
826-837
Kibriya, L. T.
d417bd65-c5dc-46a4-bc20-2975aedb0766
Málaga-Chuquitaype, C.
8aafba9a-7b97-4a30-a2d2-351f4877c665
Kashani, M. M.
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Alexander, N. A.
544fc8c7-40a4-4e81-aaab-89e78f1a6fc9
Kibriya, L. T.
d417bd65-c5dc-46a4-bc20-2975aedb0766
Málaga-Chuquitaype, C.
8aafba9a-7b97-4a30-a2d2-351f4877c665
Kashani, M. M.
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Alexander, N. A.
544fc8c7-40a4-4e81-aaab-89e78f1a6fc9

Kibriya, L. T., Málaga-Chuquitaype, C., Kashani, M. M. and Alexander, N. A. (2018) Nonlinear dynamics of self-centring rocking steel frames using finite element models. Soil Dynamics and Earthquake Engineering, 115, 826-837. (doi:10.1016/j.soildyn.2018.09.036).

Record type: Article

Abstract

Rocking post-tensioned steel frames capitalise on the use of rocking joints, and unbonded post-tensioning strands to provide self-centring action. Investigations on the complex and unconventional nonlinear dynamics of tied rocking steel frames, exclusive of supplemental damping methods, are presently limited. Increasing levels of energy-dissipation reduce the probability of observing nonlinear dynamic phenomena such as co-existing (high/low) amplitude responses at and around the system's nonlinear resonance. To this end, a finite element (FE) modelling framework is presented, validated and extended to multi-storey steel buildings. It is shown that the simulation strategies proposed enable an accurate representation of the complex nonlinear dynamics of self-centring structures, over a wide range of excitation frequencies and amplitudes. The methodology, applied to multi-storey steel frames, captures the presence of sub-harmonic resonances and higher-modes. It is also demonstrated that the additional demands observed in the rocking columns are the consequence of the asymmetry of the member boundary conditions.

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J22_Nonlinear_Dynamics_FE - Accepted Manuscript
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More information

Accepted/In Press date: 26 September 2018
e-pub ahead of print date: 29 October 2018
Published date: 1 December 2018
Keywords: Finite-element, Nonlinear dynamics, Post-tensioned moment frame, Rocking, Self-centring

Identifiers

Local EPrints ID: 426377
URI: http://eprints.soton.ac.uk/id/eprint/426377
ISSN: 0267-7261
PURE UUID: 495e2044-67ab-4ae8-842f-f4cb63b92283
ORCID for M. M. Kashani: ORCID iD orcid.org/0000-0003-0008-0007

Catalogue record

Date deposited: 26 Nov 2018 17:30
Last modified: 07 Oct 2020 04:27

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