000013145 001__ 13145
000013145 005__ 20161114160329.0
000013145 04107 $$aeng
000013145 046__ $$k2009-06-22
000013145 100__ $$aParaskeva T., S.
000013145 24500 $$aSeismic assessment of bridges with different configuration, degree of irregularity and dynamic characteristics using multimodal pushover curves

000013145 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013145 260__ $$bNational Technical University of Athens, 2009
000013145 506__ $$arestricted
000013145 520__ $$2eng$$aIn seismic assessment of structures the pushover curve is a key tool, in the sense that it provides a good description of the strength and the available ductility of the structure, both combined in a single diagram. The present study assesses the seismic performance of bridges with different configuration, degree of irregularity and dynamic characteristics. The first structure is a 638m-long multispan bridge with significant curvature in plan, unequal pier heights and different types of pier to deck connections. The second one is an overcrossing bridge with three spans and total length 100m, typical in modern motorway construction in Europe, which although ostensibly a regular structure is found to exhibit a rather unsymetric response. The third one is a 247m-long three-span bridge with small curvature in plan and piers of unequal height that are monolithically connected to the deck. The bridges are assessed using response spectrum, ‘standard’ and modal pushover analyses, as well as the more rigorous non-linear response history analysis (NL-RHA). Multimodal pushover curves are derived for each bridge using modal pushover analysis. Dynamic pushover curves are also derived to investigate the accuracy and efficiency of both multimodal and ‘standard’ pushover curves for the selected bridges. The study shows that the multimodal pushover curve reasonably matches the ‘dynamic’ pushover curve derived from the more rigorous NL-RHA in all cases. On the contrary, ‘standard’ pushover analysis is found to be valuable only for the assessment of the actual inelastic response of the bridge with regular response, where the influence of higher modes was found to be insignificant. An important issue regarding the applicability of modal pushover method to bridges is not only the influence of the modal participation factor on the response of the structure but also the boundary conditions at the abutments that affect the torsional response of the bridge.

000013145 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013145 653__ $$abridges; seismic design; pushover curve; modal pushover; multimodal pushover curves; inelastic analysis; reinforced concrete Abstract. In seismic assessment of structures the pushover curve is a key tool, in the sense that it provides a good description of the strength and the available ductility of the structure, both combined in a single diagram. The present study assesses the seismic performance of bridges with different configuration, degree of irregularity and dynamic characteristics. The first structure is a 638m-long multispan bridge with significant curvature in plan, unequal pier heights and different types of pier to deck connections. The second one is an overcrossing bridge with three spans and total length 100m, typical in modern motorway construction in Europe, which although ostensibly a regular structure is found to exhibit a rather unsymetric response. The third one is a 247m-long three-span bridge with small curvature in plan and piers of unequal height that are monolithically connected to the deck. The bridges are assessed using response spectrum, ‘standard’ and modal pushover analyses, as well as the more rigorous non-linear response history analysis (NL-RHA). Multimodal pushover curves are derived for each bridge using modal pushover analysis. Dynamic pushover curves are also derived to investigate the accuracy and efficiency of both multimodal and ‘standard’ pushover curves for the selected bridges. The study shows that the multimodal pushover curve reasonably matches the ‘dynamic’ pushover curve derived from the more rigorous NL-RHA in all cases. On the contrary, ‘standard’ pushover analysis is found to be valuable only for the assessment of the actual inelastic response of the bridge with regular response, where the influence of higher modes was found to be insignificant. An important issue regarding the applicability of modal pushover method to bridges is not only the influence of the modal participation factor on the response of the structure but also the boundary conditions at the abutments that affect the torsional response of the bridge.

000013145 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013145 720__ $$aParaskeva T., S.$$iKappos A., J.
000013145 8560_ $$ffischerc@itam.cas.cz
000013145 8564_ $$s549054$$uhttps://invenio.itam.cas.cz/record/13145/files/CD195.pdf$$yOriginal version of the author's contribution as presented on CD, section: Analysis methods for bridges subjected to seismic actions - ii (MS).
000013145 962__ $$r13074
000013145 980__ $$aPAPER