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

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)826-837
Number of pages12
JournalSoil Dynamics and Earthquake Engineering
Volume115
Early online date29 Oct 2018
DOIs
DateSubmitted - 10 May 2018
DateAccepted/In press - 26 Sep 2018
DateE-pub ahead of print - 29 Oct 2018
DatePublished (current) - Dec 2018

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.

    Research areas

  • Finite-element, Nonlinear dynamics, Post-tensioned moment frame, Rocking, Self-centring

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