A semi-graphic approach to the fire resistance assessment of a gable steel frame

Mariusz Maślak,

Anna Tkaczyk

Abstrakt

An alternative design approach, helpful in the critical temperature evaluation for a gable steel frame exposed to fire, is proposed and discussed in this article. This approach is based on the specification of a system of equilibrium formulae, generalized to the case of fire. All these equations result from the graphical identification of the redundant bending moment distribution in the frame members relating to the particular collapse mechanisms being kinematically admissible. Only such a mechanism which corresponds to the activation of a suitable sequence of the appropriate number of plastic hinges while maintaining the requirements of the classical bending moment redistribution is recognized as conclusive for the considered frame structure.

Słowa kluczowe: gable frame, fire, critical temperature, fire resistance, static approach
References

Chen W.F., Sohal I., Plastic design and second-order analysis of steel frames, Springer Verlag, 1994.

Maślak M., Tkaczyk A., Fire resistance of simple steel frame – kinematic approach to evaluation, Proceedings of 6th European Conference on Steel and Composite Structures “Eurosteel 2011”, Budapest, Hungary, August 31–September 2, 2011, Vol. B, 1497–1502.

Maślak M., Tkaczyk A., Oszacowanie nośności granicznej ramy stalowej w pożarze rozwiniętym, Inżynieria i Budownictwo, 3/2012, 160–163.

EN 1993-1-2, Eurocode 3: Design of Steel Structures, Part 1–2: General Rules – Structural Fire Design.

Maślak M., Tkaczyk A., Szacowanie temperatury krytycznej ogarniętej pożarem stalowej ramy portalowej z wykorzystaniem chwilowego środka obrotu, Materiały II Międzynarodowej Polsko-U kraińskiej Konferencji Naukowo-Technicznej „Aktualne Problemy Konstrukcji Metalowych APKM 2014”, Gdańsk, 27–28.11.2014, IS BN: 978-83-931174-3-7, 163–166.