000013641 001__ 13641
000013641 005__ 20161114170126.0
000013641 04107 $$aeng
000013641 046__ $$k2011-05-25
000013641 100__ $$aManos, G.
000013641 24500 $$aPreliminary Design of Seismically Isolated R/C Highway Overpasses - Features of Relevant Software and Experimental Testing of Elastomeric Bearings

000013641 24630 $$n3.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013641 260__ $$bNational Technical University of Athens, 2011
000013641 506__ $$arestricted
000013641 520__ $$2eng$$aThe preliminary design of seismically isolated R/C highway overpasses is the target of a software based on the current design provisions of Eurocode 8 (Part 2) as well as on engineering decisions included in the expert system. The features of this expert system, which is aimed to facilitate the design of a highway overpass by isolating its deck with the inclusion of elastomeric bearings, are presented and discussed. For such an upgrade scheme a number of successive checks is necessary in order to select an optimum geometry of the bearings. The developed software includes a series of checks provided by Eurocode 8 (Part 2), in order to ensure the satisfactory seismic performance of the selected upgrade scheme. In doing so, the software accesses a specially created database of the geometrical and mechanical characteristics of either cylindrical or prismatic elastometallic bearings which are commercially available; this database can be easily enriched by relevant data from laboratory tests on isolation devices. The basic assumptions included in the software are (a) modeling the seismic response of the bridge overpass as a SDOF system, and (b) only the longitudinal direction response is considered; it is common practice for seismically isolated bridge systems to restrain the transverse movement of the deck by stoppers. Moreover, the results form a number of tests performed in the Laboratory of Strength of Materials and Structures of Aristotle University, verified the quality of the production process of a local producer of elastomeric bearings subjecting production samples to the sequence of tests specified by International Standard ISO 22762-1 (2005). Strain amplitudes larger than 250% resulted in the debonding of the elastomer from the steel plating. Artificial aging resulted in a small increase of the axial (vertical) stiffness and a small decrease of the shear (horizontal) stiffness of the tested bearings. More specimens must be tested to validate further these findings.

000013641 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013641 653__ $$abridges; seismic isolation; knowledge-based systems; software; preliminary design; testing of elastomeric bearings

000013641 7112_ $$aCOMPDYN 2011 - 3rd International Thematic Conference$$cIsland of Corfu (GR)$$d2011-05-25 / 2011-05-28$$gCOMPDYN2011
000013641 720__ $$aManos, G.$$iMitoulis, S.$$iSextos, A.
000013641 8560_ $$ffischerc@itam.cas.cz
000013641 8564_ $$s1697390$$uhttp://invenio.itam.cas.cz/record/13641/files/422.pdf$$yOriginal version of the author's contribution as presented on CD, section: MS 05 Analysis Methods for the Seismic Design and Assessment of Bridges.
000013641 962__ $$r13401
000013641 980__ $$aPAPER