000021568 001__ 21568
000021568 005__ 20170622131252.0
000021568 04107 $$aeng
000021568 046__ $$k2017-06-15
000021568 100__ $$aSalameh, Christelle
000021568 24500 $$aESTIMATION OF AGGRAVATING EFFECTS DUE TO THE COINCIDENCE BETWEEN SOIL AND STRUCTURE: NUMERICAL STUDY FOR MDOF SYSTEMS

000021568 24630 $$n6.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000021568 260__ $$bNational Technical University of Athens, 2017
000021568 506__ $$arestricted
000021568 520__ $$2eng$$aPost-seismic investigations repeatedly indicate that structures having frequencies close to foundation soil frequencies exhibit significantly heavier damages (Caracas 1967, Mexico 1985, Pujili, Ecuador 1996; L’Aquila 2009). However, these observations are generally not taken directly into account, neither in present-day seismic regulations (small scale), nor at large-scale seismic risk analysis. A comprehensive numerical analysis to investigate the effect of coincidence between soil and building frequencies is performed. A total of 887 realistic soil profiles are coupled with a set of 141 SDOF elastoplastic oscillators, and their combined (non-linear) response are computed both for linear and non-linear soil behavior, for a large number (60) of input signals of various PGA levels and frequency contents. The associated damage is quantified on the basis of the maximum displacement as compared to both yield and ultimate post-elastic displacements, according to the RISK-UE project recommendations (Lagomarsino and Giovinazzi, 2006), and compared with the damage obtained in the case of a similar building located on rock. The correlation between this soil/rock damage increment and a number of simplified mechanical and loading parameters is then analyzed using a neural network approach. The results emphasize the key role played by the building/soil frequency ratio in the damage estimation; other important parameters are the PGA level, the soil/rock impedance contrast and the building ductility. Multi degree-of-freedom (MDOF) elastoplastic oscillators are then investigated. One of the main outcomes is that even if the existence of harmonic frequencies for MDOF somewhat modifies the results, particularly in the linear range (low PGA), the concept of spectral coincidence remains the key contribution in rock to soil damage increase.

000021568 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000021568 653__ $$aspectral coincidence, non-linearity, seismic damage, neural network, multi degree-of-freedom

000021568 7112_ $$aCOMPDYN 2017 - 6th International Thematic Conference$$cRhodes Island (GR)$$d2017-06-15 / 2017-06-17$$gCOMPDYN2017
000021568 720__ $$aSalameh, Christelle$$iCornou, Cécile$$iGuillier, Bertrand$$iBard, Pierre-Yves$$iNeziri, Zabedin
000021568 8560_ $$ffischerc@itam.cas.cz
000021568 8564_ $$s660498$$uhttps://invenio.itam.cas.cz/record/21568/files/17035.pdf$$yOriginal version of the author's contribution as presented on CD, section: 
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000021568 962__ $$r21500
000021568 980__ $$aPAPER