Yielding oscillator subjected to simple pulse waveforms: Numerical analysis & closed-form solutions

Mylonakis, G; Voyagaki, E

dc.contributor.author	Mylonakis, G	en
dc.contributor.author	Voyagaki, E	en
dc.date.accessioned	2014-03-01T01:25:30Z
dc.date.available	2014-03-01T01:25:30Z
dc.date.issued	2006	en
dc.identifier.issn	0098-8847	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17692
dc.subject	Case study	en
dc.subject	Closed-form solution	en
dc.subject	Near fault	en
dc.subject	Numerical analysis	en
dc.subject	Pulse	en
dc.subject	Yielding oscillator	en
dc.subject.classification	Engineering, Civil	en
dc.subject.classification	Engineering, Geological	en
dc.subject.other	Damping	en
dc.subject.other	Ductility	en
dc.subject.other	Earthquake resistance	en
dc.subject.other	Numerical analysis	en
dc.subject.other	Oscillators (mechanical)	en
dc.subject.other	Stiffness	en
dc.subject.other	Waveform analysis	en
dc.subject.other	Closed-form solution	en
dc.subject.other	Ground acceleration pulses	en
dc.subject.other	Near fault	en
dc.subject.other	Yielding oscillator	en
dc.subject.other	Degrees of freedom (mechanics)	en
dc.subject.other	ductility	en
dc.subject.other	earthquake rupture	en
dc.subject.other	elastic wave	en
dc.subject.other	fault	en
dc.subject.other	ground motion	en
dc.subject.other	numerical model	en
dc.subject.other	structural response	en
dc.subject.other	waveform analysis	en
dc.title	Yielding oscillator subjected to simple pulse waveforms: Numerical analysis & closed-form solutions	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/eqe.615	en
heal.identifier.secondary	http://dx.doi.org/10.1002/eqe.615	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	Numerical and analytical solutions are presented for the elastic and inelastic response of single-degree-of-freedom yielding oscillators to idealized ground acceleration pulses. These motions are typical of near-fault earthquake recordings generated by forward rupture directivity and may inflict damage in the absence of substantial structural strength and ductility capacity. Four basic pulse waveforms are examined: (1) triangular; (2) sinusoidal; (3) exponential; and (4) rectangular. In the first part of the article, a numerical study is presented of the effect of oscillator period, strength, damping, post-yielding stiffness and number of excitation cycles, on inelastic response. Results are presented in the form of dimensionless graphs and regression formulas that elucidate the salient features of the problem. It is shown that conventional R-mu relations may significantly underestimate ductility demand imposed by near-fault motions. The second part of the article concentrates on elastic -perfectly plastic oscillators. Closed-form solutions are derived for post-yielding response and associated ductility demand. It is shown that all three ground motion histories (i.e. acceleration, velocity, and displacement) control oscillator response-contrary to the widespread view that ground velocity alone is of leading importance. The derived solutions provide insight on the physics of inelastic response, which is often obscured by the complexity of numerical algorithms and actual earthquake motions. The model is evaluated against numerical results from near-field recordings. A case study is presented. Copyright (C) 2006 John Wiley & Sons, Ltd.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	Earthquake Engineering and Structural Dynamics	en
dc.identifier.doi	10.1002/eqe.615	en
dc.identifier.isi	ISI:000242684300005	en
dc.identifier.volume	35	en
dc.identifier.issue	15	en
dc.identifier.spage	1949	en
dc.identifier.epage	1974	en