000022329 001__ 22329
000022329 005__ 20170622150008.0
000022329 04107 $$aeng
000022329 046__ $$k2015-05-25
000022329 100__ $$aMazza, Fabio
000022329 24500 $$aCOMPARATIVE STUDY OF THE WIND AND EARTHQUAKE DYNAMIC RESPONSES OF FIRE EXPOSED STEEL FRAMED BUILDINGS

000022329 24630 $$n5.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000022329 260__ $$bNational Technical University of Athens, 2015
000022329 506__ $$arestricted
000022329 520__ $$2eng$$aWind design of steel-framed buildings aims to provide appropriate stiffness and strength properties of the structural elements, so as to obtain an elastic behaviour, at the same time as controlling floor displacements and accelerations. On the other hand, in a seismic design it is commonly accepted that the structural members can undergo inelastic deformations under strong ground motions, provided that these deformations be kept within an acceptable threshold; moreover, deformability thresholds are also imposed at the serviceability limit state. Nevertheless, knowledge on the wind and seismic responses in the case of fire is lacking and an amplification of the structural response is expected in the case of existing structures exposed to fire. To evaluate the wind and seismic responses following a fire, a numerical investigation is carried out with reference to the steel framed structure of a ten-storey office building, which was designed for a low-risk zone under the former Italian seismic code and in line with Eurocodes 1 and 3. More specifically, the dynamic response of the test structure in a no fire situation, along the in-plan principal directions, is compared with what would happen in the event of fire, at 500°C, 550°C and 600°C fire temperatures, hypothesizing a reduction of stiffness and strength due to fire. Four fire scenarios have been considered on the assumption that the fire compartment is confined to the area of the first level (i.e. F1), the first two (i.e. F1/2) and the upper (i.e. Fi, i=5, 10) levels, with the parametric temperature-time fire curve evaluated in accordance with Eurocode 1. Dynamic analyses are carried out in the time domain using a step-by-step initial stress-like iterative procedure. Along-wind loads are considered assuming, at each level, time histories of the wind velocity for two return periods (i.e. Tr=10 or 50 years), based on an equivalent spectrum technique. Real accelerograms, whose response spectra match those adopted by Italian seismic code for a mediumrisk seismic zone and a medium subsoil class, are considered to simulate the seismic loads.

000022329 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022329 653__ $$aSteel Framed Structures, Fire Scenarios, Time-Temperature Curves, Along-wind loads, Seismic Loads, Dynamic Analysis.

000022329 7112_ $$aCOMPDYN 2015 - 5th International Thematic Conference$$cCrete (GR)$$d2015-05-25 / 2015-05-27$$gCOMPDYN2015
000022329 720__ $$aMazza, Fabio$$iFiore, Marco
000022329 8560_ $$ffischerc@itam.cas.cz
000022329 8564_ $$s561600$$uhttps://invenio.itam.cas.cz/record/22329/files/C490.pdf$$yOriginal version of the author's contribution as presented on CD, section: 
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000022329 962__ $$r22030
000022329 980__ $$aPAPER