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Structural Engineering and Mechanics
  Volume 29, Number 1, May10 2008 , pages 37-53

Simple nonlinear static analysis of steel portal frame with pitched roof exposed to fire
Panagis G. Papadopoulos, Anastassia K. Papadopoulou and Kyriakos K. Papaioannou

    Plane steel portal frames, with pitched roof, exposed to fire, are examined. First, a determinate frame is analysed by hand. For flexible columns and shallow roof, snap-through occurs before plastic hinges mechanism is formed. An indeterminate frame with shorter columns and taller roof is also analysed by hand. Then, the same frame is simulated by a truss and a nonlinear static analysis is performed by use of a short computer program. The results of computer analysis by use of truss model are compared with those of analysis by hand and a satisfactory approximation between them is observed.
Key Words
    steel portal frame; pitched roof; fire; snap-through; plastic hinges; truss model.
Panagis G. Papadopoulos, Anastassia K. Papadopoulou and Kyriakos K. Papaioannou: Dept. of Civil Engineering, Aristotle University of Thessaloniki, 540 06 Thessaloniki, Greece

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