Parametric investigation of the stability of classical columns under harmonic and earthquake excitations

Psycharis, IN; Papastamatiou, DY; Alexandris, AP

dc.contributor.author	Psycharis, IN	en
dc.contributor.author	Papastamatiou, DY	en
dc.contributor.author	Alexandris, AP	en
dc.date.accessioned	2014-03-01T01:15:46Z
dc.date.available	2014-03-01T01:15:46Z
dc.date.issued	2000	en
dc.identifier.issn	0098-8847	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13728
dc.subject	harmonic response	en
dc.subject	earthquake response	en
dc.subject	ancient monuments	en
dc.subject	distinct element method	en
dc.subject	multidrum columns	en
dc.subject.classification	Engineering, Civil	en
dc.subject.classification	Engineering, Geological	en
dc.subject.other	RIGID BODIES	en
dc.subject.other	ROCKING	en
dc.subject.other	ASSEMBLIES	en
dc.subject.other	BLOCKS	en
dc.title	Parametric investigation of the stability of classical columns under harmonic and earthquake excitations	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/1096-9845(200008)29:8<1093::AID-EQE953>3.0.CO;2-S	en
heal.identifier.secondary	http://dx.doi.org/10.1002/1096-9845(200008)29:8<1093::AID-EQE953>3.0.CO;2-S	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	The seismic response of free-standing classical columns is analysed numerically through implementation of the distinct element method. Typical sections of two ancient temples are modelled and studied parametrically, in order to identify the main factors affecting the stability and to improve our understanding of the earthquake behaviour of such structures. The models were first subjected to harmonic base motions. The analysis showed that, for frequencies usually encountered in earthquake motions, intact multi-drum free-standing columns can withstand large amplitude harmonic excitations without collapse. The dynamic resistance decreases rapidly as the period of the harmonic excitation increases. Imperfections, such as initial tilt of the column or loss of contact area due to edge damage, also reduce the stability of the system significantly. The effects of such imperfections could be additive and the cumulative effect of many imperfections may render deteriorating abandoned monuments vulnerable to earthquakes. The response of more complete sections of the temple, such as two columns coupled with an architrave, did not deviate systematically from that of the single multi-drum column or indeed of the equivalent single block. Therefore, a much simpler single block analysis can be used to size-up the seismic threat to the monument. The model of the column of the Temple of Apollo at Bassae was also tested under recorded earthquake motions by scaling-up the acceleration amplitude progressively until collapse of the column. It was found that the columns are particularly vulnerable to long-period impulsive earthquake motions. A comparison of the instability thresholds associated with harmonic excitations and earthquake motions throws more light onto the dynamic response: it appears that around three cycles of monochromatic excitation at the predominant period of the expected earthquake motions lead to a gross prediction of the stability of a classical column during an earthquake. Copyright (C) 2000 John Wiley & Sons, Ltd.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS	en
dc.identifier.doi	10.1002/1096-9845(200008)29:8<1093::AID-EQE953>3.0.CO;2-S	en
dc.identifier.isi	ISI:000088560700002	en
dc.identifier.volume	29	en
dc.identifier.issue	8	en
dc.identifier.spage	1093	en
dc.identifier.epage	1109	en