Seismic fragility curves for greek bridges: methodology and case studies   总被引：2，自引：1，他引：1  

Ioannis F. Moschonas  Andreas J. Kappos  Panagiotis Panetsos  Vissarion Papadopoulos  Triantafyllos Makarios  Pavlos Thanopoulos 《Bulletin of Earthquake Engineering》2009,7(2):439-468

This study focusses on the estimation of seismic fragility curves for all common bridge types found in modern greek motorways. At first a classification scheme is developed in order to classify the existing bridges into a sufficient number of classes. A total of 11 representative bridge classes resulted, based on the type of piers, deck, and pier-to-deck connection. Then an analytical methodology for deriving fragility curves is proposed and applied to the representative bridge models. This procedure is based on pushover analysis of the entire bridge and definition of damage states in terms of parameters of the bridge pushover curves. The procedure differentiates the way of defining damage according to the seismic energy dissipation mechanism in each bridge, i.e. bridges with yielding piers of the column type and bridges with bearings (with or without seismic links) and non-yielding piers of the wall type. The activation of the abutment-backfill system due to closure of the gap between the deck and the abutments is also taken into account. The derived fragility curves are subjected to a first calibration against empirical curves based on damage data from the US and Japan.  相似文献   

Mantle‐derived and crustal melts dichotomy in northern Greece: spatiotemporal and geodynamic implications     

Diego Perugini  Giampiero Poli  George Christofides  George Eleftheriadis  Antonis Koroneos  Triantafyllos Soldatos 《Geological Journal》2004,39(1):63-80

Two distinct groups of subduction‐related (orogenic) granitoid rocks, one Jurassic and the other Tertiary, occur in the area between the Vardar (Axios) Zone and the Rhodope Massif in northern Greece. The two groups of granitoids differ in many respects. The first group shows evolved geochemical characters, it is not associated with mafic facies, and evidence of magmatic interaction between mantle‐ and crustal‐derived melts is lacking. The second group has less evolved geochemical characters, it is associated with larger amount of mafic facies, and magmatic interaction processes between mantle‐derived and crustal melts are ubiquitous as evidenced by mafic microgranular enclaves and synplutonic dykes showing different enrichment in K₂O, Ti, and incompatible elements. This kind of magmatism can be attributed to the complex geodynamic evolution of the area. In particular, we suggest that two successive subduction events related to the closure of the Vardar and the Pindos oceans, respectively, occurred in the investigated area from Late Jurassic to Tertiary. We relate the genesis of Jurassic granitoids to the first subduction event, whereas Tertiary granitoids are associated with the second subduction. Fluids released by the two subducted slabs induced metasomatic processes generating a ‘leopard skin’ mantle wedge able to produce mafic melts ranging from typical calc‐alkaline to ultra‐potassic. Such melts interacted in various amounts with crustal calc‐alkaline anatectic melts to generate the wide spectrum of Tertiary granitoids occurring in the study area. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

Novel findings on the dilatancy and non-coaxiality of sand under generalised loading     

Triantafyllos  P. K.  Georgiannou  V. N.  Dafalias  Y. F.  Georgopoulos  I.-O. 《Acta Geotechnica》2021,16(6):1699-1734

Acta Geotechnica - The dilatancy and non-coaxiality of sand are investigated under generalised loading including rotation of the stress principal axes (PA), in drained and undrained conditions....  相似文献   

Structure of the Central North Aegean Trough: an active strike-slip deformation zone   总被引：1，自引：0，他引：1  

Nicolas Roussos  Triantafyllos Lyssimachou 《Basin Research》1991,3(1):37-46

Detailed interpretation of marine seismic data shows the presence of an extending, active, dextral strike-slip fault zone at the south edge of the Mount Athos Peninsula. The zone is over 100 km long and has both transtensional and transpressive features observable on the seismic lines. We suggest that dextral strike-slip displacement along the zone is on the order of 5–7 km. The structure and fault patterns of Recent deformation in the Central North Aegean Trough is typical of strike-slip tectonism.  相似文献