Analog simulations of earthquake motions

Two analog methods of simulating earthquake motions are presented. One method uses sections of a gaussian random function with a given power spectrum. The second method uses a hybrid computer that permits any given type of ground motion to be simulated. Linear single-degree-of-freedom systems were excited by the simulated earthquakes and their responses were measured. Base shear was used as a measure of the response and empirical formulas were developed for base shear as a function of the mass and period of the system and the magnitude of the ground acceleration.L'auteur pr\ue9sente deux m\ue9thodes de simulation par ordinateurs des movements du sol caus\ue9s par les tremblements de terre. L'une de ces m\ue9thodes utilise une partie d'une courbe gaussienne de probabilit\ue9 avec un diagramme de r\ue9 ponse donn\ue9. La seconde m\ue9thode emploie un ordinateur hybride permettant la simulation de n'importe quel genre de mouvement du sol. Les d\ue9placements d\ufbs aux tremblements de terre simul\ue9s agissaient sur des syst\ue8mes lin\ue9aires \ue0 un seul degr\ue9 de libert\ue9, dont on mesurait les r\ue9ponses. L' effort de cisaillement basal a \ue9t\ue9 utilis\ue9 comme mesure de la r\ue9ponse, et l'auteur \ue9tablit des formules empiriques permettant de calculer l'effort de cisaillement en fonction de la masse et de la p\ue9riode du syst\ue8me, et de l'importance de la force d'acc\ue9l\ue9ration transmise au sol.Peer reviewed: NoNRC publication: Ye