Naslov
Performance based design of unbraced steel frames exposed to natural fire scenarios

Autori
Couto, Carlos ; Silva, Thiago ; Carić, Martina ; Vila Real, Paulo ; Skejić, Davor

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the International Conference in Dubrovnik - in edition of Applications of Structural Fire Engineering - ASFE 2015 / Wald, F. ; Burgess, I. ; Jelčić Rukavina, M. ; Bjegović, D. ; Horová, K. - Prag : Czech technical university in Prague, 2015, 171-176

ISBN
978-80-01-05204-4

Skup
4th International Conference - Applications of Structural Fire Engineering - ASFE 2015

Mjesto i datum
Dubrovnik, Hrvatska, 15.10.2015. - 16.10.2015

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Structural fire design ; Steel frames ; Buckling ; Natural fire ; Performance based design
(structural fire design ; steel frames ; buckling ; natural fire ; performance based design)

Sažetak
For the structural fire design of steel frames, the Eurocode 3 Part 1-2 states that, using simple calculation methods, a global analysis of the frame should be done as for normal temperature and the buckling length of a column for the fire design should generally be calculated as for normal temperature design. However, in the case of a braced frame in which each storey comprises a separate fire compartment with sufficient fire resistance, the buckling length of a continuous column may be taken as 0.5L in an intermediate storey and 0.7L in the top storey, where L is the system length in the relevant storey. However under the same circumstances but for unbraced frames no guidance is given in the Eurocode. In reference (Couto C. et. al, 2013) it is suggested 1.0L as the buckling length of all the columns except those belonging to the first storey of a pinned framed where 2.0L should be taken instead. According to the Eurocodes, it is possible for structural engineers to consider physical based thermal actions and to do performance based design instead of using prescriptive rules based on nominal fire curves. However, it is unclear if the consideration of such values for the buckling lengths is adequate for using with performance based designs. This study contributes for clarifying this question, by analysing the evolution of the critical load, thus the buckling lengths, for the steel frames exposed to natural fire scenarios. Finally, a comparison is made between simple and advanced calculation models and it is demonstrated that the suggested buckling lengths are adequate for structural fire design with performance based design methods.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo

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