Numerical investigation for the nonlinear dynamic response of self-centring rocking frames

LT Kibriya, C Malaga-Chuquitaype, M M Kashani, Nicholas Alexander

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

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Abstract

Conventional seismic design standards are rooted in the notion of collapse-prevention to ensure life-safety during major seismic events. To this end, modern code-conforming buildings are designed to accept a certain level of damage during earthquakes. Nevertheless, this design philosophy does not explicitly address damage mitigation, which leads to substantial post-earthquake economic losses. Rocking post-tensioned frames are a highly sustainable seismic design solution which remains operational after an earthquake event. They capitalise on the use of: (i) unbonded post-tensioned strands to provide overturning resistance and self-centring action, and (ii) rocking (opening) joints at the column-foundation and beam-column connections. Preceding research has proposed modelling strategies to capture the highly nonlinear behaviour of rocking structures. Nevertheless, numerical modelling techniques generating frequency response functions for the study of the non-linear dynamic properties of post-tensioned rocking moment frames without any sacrificial elements or external damping, are currently limited. Thus, it is imperative to develop modelling procedures which enable an accurate representation of the fundamental non-linear dynamic behaviour of rocking frames over a range of ground-motion excitations. The physical model of a steel post-tensioned rocking frame, which has been formerly tested under static and dynamic conditions, is employed in this paper in order to validate a new advanced finite element framework. A numerical study is presented, which incorporates a one-storey model, and includes static and dynamic responses. The results are compared with experimental and discrete-element models, and generalizable modelling considerations are presented. It is shown that the proposed method encompasses a simplified modelling approach and effectively represents the complete non-linear response of rocking moment-resisting frames.
Original languageEnglish
Title of host publicationProceedings of the 16th European Conference on Earthquake Engineering (16ECEE)
PublisherEuropean Association for Earthquake Engineering (EAEE)
Number of pages11
Publication statusPublished - 22 Jun 2018
Event16th European Conference on Earthquake Engineering: Thessaloniki - 2018 - Thessaloniki, Greece
Duration: 18 Jun 201821 Jun 2018
Conference number: 16
http://www.16ecee.org/

Conference

Conference16th European Conference on Earthquake Engineering
Abbreviated title16ECEE
CountryGreece
CityThessaloniki
Period18/06/1821/06/18
Internet address

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