000022089 001__ 22089
000022089 005__ 20170622145956.0
000022089 04107 $$aeng
000022089 046__ $$k2015-05-25
000022089 100__ $$aFuringhetti, Marco
000022089 24500 $$aNUMERICAL ASSESSMENT ON THE SEISMIC RESPONSE OF A BASE-ISOLATED BUILDING UNDER BI-DIRECTIONAL MOTION

000022089 24630 $$n5.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000022089 260__ $$bNational Technical University of Athens, 2015
000022089 506__ $$arestricted
000022089 520__ $$2eng$$aExperimental and analytical studies on Concave Sliding Surface devices have underlined that the hysteretic characteristics under bi-directional input motion are highly nonlinear, in comparison with the uni-directional case. The force response of the device along both directions of motion strongly depend on the shape of the trajectory, because of the stepwise changing of direction of the frictional force, rather than in a uni-directional motion in which all forces have the same direction. Together with these aspects, also the variation of the frictional properties with respect to sliding velocity (Velocity Effect), vertical load (Vertical Load Effect) and heating phenomena originated at the sliding interfaces (Cycling Effect) increase the non-linearity of the behavior of such kind of isolators, leading to dispersions of the peak quantities when time history analyses are performed: such dispersions can not be neglected a priori, but they have to be accurately evaluated. In addition, experimental tests have shown widely sparse frictional properties of the sliding materials commonly used for CSS devices, even when the same conditions of loading are considered. Moreover, in real applications, the spatial distribution of both the devices and the isolated building affect the overall response, especially when irregularities in the installation of the isolators are considered, which results into uneven inclinations of the sliding surfaces with respect to the horizontal plane. In this endeavor a wide numerical campaign has been carried out on a case study, considering several layout conditions, the actual dispersion of the frictional characteristics of the device, and different models of the friction coefficient for all the isolators. The results of all the numerical simulations, performed by means of time history analyses, have allowed to underline some important aspects which must be accounted for when designing a structural system, isolated using a grid of CSS devices, under bi-directional seismic excitations.

000022089 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022089 653__ $$aConcave Sliding Surface device, Bi-Directional motion, cycling effect, friction coefficient, heating phenomena.

000022089 7112_ $$aCOMPDYN 2015 - 5th International Thematic Conference$$cCrete (GR)$$d2015-05-25 / 2015-05-27$$gCOMPDYN2015
000022089 720__ $$aFuringhetti, Marco$$iPavese, Alberto
000022089 8560_ $$ffischerc@itam.cas.cz
000022089 8564_ $$s333449$$uhttps://invenio.itam.cas.cz/record/22089/files/C1169.pdf$$yOriginal version of the author's contribution as presented on CD, section: 
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000022089 962__ $$r22030
000022089 980__ $$aPAPER