000013089 001__ 13089
000013089 005__ 20161114160327.0
000013089 04107 $$aeng
000013089 046__ $$k2009-06-22
000013089 100__ $$aKappos A., J.
000013089 24500 $$aSeismic assessment of an overpass bridge with a torsional fundamental mode

000013089 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013089 260__ $$bNational Technical University of Athens, 2009
000013089 506__ $$arestricted
000013089 520__ $$2eng$$aThe study focuses on the seismic response of a straight, overpass bridge with two equal spans, whose fundamental mode, unlike most bridges of this type, is purely torsional. The particular structure is supported on a two-column pier of cylindrical cross-section that is monolithically connected to the deck, while it rests on its two abutments through elastomeric bearings. The seismic assessment of the bridge was performed in the longitudinal and transverse directions using non-linear static analysis. An additional pushover analysis was carried out using the fundamental (torsional) mode loading. Parametric analyses were carried out involving consideration of foundation compliance, and various scenarios of accidental eccentricity that would trigger the torsional mode. The pushover curves derived in the longitudinal and transverse directions highlight the satisfactory performance of the bridge, even for motions twice as strong as the design earthquake. On the other hand, if one focuses on the fundamental torsional mode, the corresponding load pattern is antisymmetric and the resulting base shear zero, hence a ‘standard’ pushover curve cannot be drawn; an alternative pushover curve in terms of abutment shear vs. deck maximum displacement (that occurs at the abutment) is found to be a meaningful measure of the overall inelastic response of the bridge. Furthermore, assessment based on the torsional fundamental mode leads to failure of the elastomeric bearings, but the related displacements are irrelevant since they are about an order of magnitude higher than the design displacement. Clearly, proper assessment of the bridge should be based on the longitudinal and transverse loading distributions, wherein the critical pier section failure precedes the bearing failure.

000013089 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013089 653__ $$aBridges, Non-linear Static (Pushover) Analysis, Bearings, Torsional Effects, Reinforced Concrete.

000013089 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013089 720__ $$aKappos A., J.$$iGoutzika E., D.$$iSextos A., G.
000013089 8560_ $$ffischerc@itam.cas.cz
000013089 8564_ $$s427564$$uhttps://invenio.itam.cas.cz/record/13089/files/CD118.pdf$$yOriginal version of the author's contribution as presented on CD, section: Analysis methods for bridges subjected to seismic actions - ii (MS).
000013089 962__ $$r13074
000013089 980__ $$aPAPER