Info

Source: European Committee for Standardisation (CEN), 2001, prEN 1994-1-2, Eurocode 4: Design of Composite Steel and Concrete Structures, Part 1.2: Structural Fire Design (London: British Standards Institution).

Source: European Committee for Standardisation (CEN), 2001, prEN 1994-1-2, Eurocode 4: Design of Composite Steel and Concrete Structures, Part 1.2: Structural Fire Design (London: British Standards Institution).

temperature, lateral torsional buckling of a steel beam is usually not a problem in fire. This is because steel beams that are required to have fire resistance are floor beams whose compression flanges are restrained by the floor slabs. Steel beams that should be checked for lateral torsional buckling at ambient temperature, for example, roof beams, do not require fire resistance. Therefore, the following design method will only consider the cross-sectional bending resistance of a beam.

Eurocode 3 gives two methods to calculate the plastic bending moment capacity of a steel beam. The first method is the bending moment capacity method that is generally applicable to cross-sections with nonuniform temperature distributions. In this method, the steel cross-section is divided into a number of thin slices of approximately the same temperature. The plastic bending moment capacity of the cross-section is calculated according to the reduced strengths of steel at the temperatures of these slices.

0 0

Post a comment