A sustainable seismic input reduction system for monuments, for existing and new structures by creating large, stiff and strong foundations - practical applications

Carydis, P

dc.contributor.author	Carydis, P	en
dc.date.accessioned	2014-03-01T02:01:43Z
dc.date.available	2014-03-01T02:01:43Z
dc.date.issued	2011	en
dc.identifier.issn	03931420	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29228
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-84859073642&partnerID=40&md5=f2137fa449f4ab4f8201e18c96554adc	en
dc.subject	Existing buildings	en
dc.subject	Foundations	en
dc.subject	Monuments	en
dc.subject	New buildings	en
dc.subject	Seismic isolation	en
dc.subject	Strengthening	en
dc.subject.other	Basic parameters	en
dc.subject.other	Building foundations	en
dc.subject.other	Center of gravity	en
dc.subject.other	Class A	en
dc.subject.other	Code requirements	en
dc.subject.other	Elastic beam	en
dc.subject.other	Existing building	en
dc.subject.other	Existing structure	en
dc.subject.other	Free fields	en
dc.subject.other	Ground motions	en
dc.subject.other	High frequency	en
dc.subject.other	Longitudinal direction	en
dc.subject.other	Macroseismic	en
dc.subject.other	Monuments	en
dc.subject.other	Phase lags	en
dc.subject.other	Predominant period	en
dc.subject.other	Reduction systems	en
dc.subject.other	Response spectra	en
dc.subject.other	Seismic excitations	en
dc.subject.other	Seismic input	en
dc.subject.other	Seismic isolation	en
dc.subject.other	Strong ground motion	en
dc.subject.other	Structural solutions	en
dc.subject.other	Technical support	en
dc.subject.other	Time history	en
dc.subject.other	Earthquakes	en
dc.subject.other	Strengthening (metal)	en
dc.subject.other	Foundations	en
dc.title	A sustainable seismic input reduction system for monuments, for existing and new structures by creating large, stiff and strong foundations - practical applications	en
heal.type	journalArticle	en
heal.publicationDate	2011	en
heal.abstract	A system is described, aiming at reducing the seismic excitation of structures, based on pure structural solutions. The basic idea is to exploit the phase lag of the incident seismic waves along the foundation and, accordingly, to design it in order to possess the adequate stiffness and strength. The longer the foundation is, the larger the phase lag becomes. It is, therefore, well understandable that under this requirement, foundations of the maximum possible length must be designed. The presented methodology might be proved quite valuable for existing structures and especially for monuments, where, in most cases, it is not possible to proceed to the necessary strengthening interventions in the structure above its foundation. As a technical support of the present investigation, the size of the foundation as a two dimensional elastic beam and the velocity of the propagation of the ground motion are examined as basic parameters. Two strong ground motions have been used, each one with quite different characteristics compared to the other one: an artificial time history of rather high frequency, fitting to EC8, Type 1, ground class A and a natural ground motion of the Edessa, Greece 1990, M = 5.9, earthquake. The Edessa earthquake is characterized by much longer predominant periods of vibration compared to the artificial one. Various lengths of the foundation beam have been examined in combination with the velocity of the propagation of the ground motion along the longitudinal direction of the beam. The achieved motions at the center of gravity of the beam as well as the pertinent response spectra are calculated. These spectra are compared to the free field ones. At the beginning of the paper, it is tried to explain the inconsistency between macroseismic observations and earthquake code requirements concerning the effects of the size of the building foundation. At the end of the paper, the results of the described methodology are demonstrated in several practical case studies.	en
heal.journalName	Ingegneria Sismica	en
dc.identifier.volume	28	en
dc.identifier.issue	2	en
dc.identifier.spage	7	en
dc.identifier.epage	24	en