Finite Element Modelling of Nonlinear Seismic Site Response in Soft Clay

Hooman Torabi, Mohammad T. Rayhani

In the proceedings of: GeoMontréal 2013: 66th Canadian Geotechnical Conference; 11th joint with IAH-CNC

Session: Posters - Geotechnical

RÉSUMÉ: Les enregdémontré tridimensiode compocentrifugatsismique mouvemenlinéarité duêtre le parde grande 1 INTR It is wesubsurfacefrequency evaluationduring theearthquakdeposit infrom the componenimposing lclay deporesonant vextensive above meinsight intnonlinearitseed et alsoil depointensity oground mo Ottawsensitive bedrock wgeologicalElement esponse Torabi, Mohaent of Civil anCT nd motion recohear waves emseismic site reslly verified by rs on seismic rotion; howeverbined effect of r of nonlinear rfluential on nongistrements deamplification onnel de l'élémortement du sotion, suivie d'ude l'argile à nts du sol, toutu sol. L'effet coramètre de cons amplitudes àRODUCTION ll understoode soil layers content of en of strong groe 1985 Mexices reveal sign amplifying sbedrock. Alsonts of earthqualarge inertial foosits. This evvibration occursstudies followentioned earthto the effect ty on the grou. 1992). It is knosit, combinedof input motion otion. wa Valley in esoft soil knowwith shear wav setting which Modellinin Soft Cammad T.Raynd Environmeordings in the manating from bsponse in softcentrifuge testresponse of Ler, level of amplfrequency conresponse of sonlinear responss mouvementsdes ondes dment fini est utiliol entièrement ne série d'étudLeda. Il se trtefois, le niveaombiné de la tntrôle de la répà haute fréquen that geologhighly influenearthquake indound motion reco City and 1gnificant capaseismic shear , it was showake motion undorce on structurvent may bes between soilwing the obsehquakes have of local site und surface mnown that stresd with frequeare influentialeastern Canadwn as Leda clave velocity of is located withng of NonClay yhani ntal Engineerregions underlbedrock. In thit clay using a t data, followededa clay. It is fification is attentent and peakoil. It was concse of soft clay ds du sol dansde cisaillemenisé pour simulenon linéaire. des paramétriqrouve que l'amau d'amplificatioteneur en fréquponse non linéance sont moins gical conditionnce amplitude duced waves.ecordings obta1989 Loma Pability of soft waves emanwn that long pdergo amplificares founded on intensified w and structure.ervations fromprovided valucondition andmotion (Idriss 1ss-strain behavency content factors on suda is underlaiay, and fairly 2700 m/s. Suhin western Qulinear Sering - Carletolain by thick las paper, a threfully nonlineard by a series ofound that signenuated under k acceleration luded that inpudeposit. s les régions ct sismiques éer la réponse sCapacité de cques pour évalmplification sigon est atténuéuence et accéaire du sol. Il ainfluents sur lan of and The ained Prieta soil ating eriod ation, n soft when . The m the uable soil 1990; ior of and rface n by rigid uch a ebec seismdue tlarge soil dSnumesurfaone develal. (1out inare eshear(1999modeinelasfrom modeInElempreseundemodeconststrainfoundeismic on University, ayer of soft claee dimensionar soil constitutof parametric snificant amplificstrong groundof ground mout motions inclcouvris par unémanant de rsismique du sitece modèle estluer le rôle desgnificative peué sous forts molération maxima été conclu qua réponse non mic zone has cto not only low impedance codeposit. everal studieserical approacce response uof the widely loped by Schn1991). In this pn frequency doemployed usingr modulus as 9) developed el using nonlinstic ground redownhole test el. n this study,ment model ofented, which alr multi-directioel is carried titutive model n response of sd to be dominaOttawa, Ontaay have demoal Finite Elemetive model. Castudies to evacation might bd motion due tootion was showuding high freqne couche éparoche. Dans e en argile molt vérifiée par s différents pat être observéouvements du male du mouveue les mouvemlinéaire du giscapability of amshear wave veontrast betwees have been ches for the under seismic practiced pronabel (1972) anprogram, numeomain, and Keg equivalent linshear strain a time domanear constitutivesponse. The were used to a three dimef nonlinear sellows for investonal seismic exout by emof soil to casoft soil since laant, particularlyario, Canadaonstrated amplint model is emapability of thisluate the role e observed duo nonlinearity own to be the quency large aaisse d'argile cet article, ulle en utilisant ules données daramètres sur lée au cours sol en raison dement du sol s'ments d'entrée ement d'argile mplifying seismelocity of the soen bedrock andundertaken testimation oloading. fiSHAograms which nd extended berical solution elvin-Voigt typenear method foincreases. Boain Finite Elemve soil model recorded accvalidate accuraensional dynameismic site restigating groundxcitation. This cploying fully apture hysteretarge material dy in soils withification of mployed to s model is of various uring weak of the soil. controlling amplitudes molle, ont n modèle un modèle de test de a réponse de faibles de la non-'est révélé y compris molle. mic waves oil but also d overlying to provide of ground AKE 91fl is is initially by Idriss et is carried e elements or updating orja et al. ment (FE) to predict celerations acy of this mic Finite sponse is d response continuum nonlinear tic stress-damping is low shear

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