Distribution of temperature in steel and composite beams and joints under natural fire
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Distribution of temperature in steel and composite beams and joints under natural fire F. Hanus (B.E.S.T. design office) & J.-M. Franssen (Univ. of Liege). Motivation: analysis of connections in cooling phase => calculation of temperatures in steel beam and in joints.

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Distribution of temperature in steel and composite beams and joints under natural fire

F. Hanus (B.E.S.T. design office) & J.-M. Franssen (Univ. of Liege)

Motivation: analysis of connections in cooling phase => calculation of temperatures in steel beam and in joints.

Existing « lumped capacitance » method:

OK for unprotected steel sections (heating and cooling)

OK for protected steel sections (heating)

OK for lower half of a steel beam with a slab on the upper flange

Not OK for the upper part of the steel beam with a slab



Contains 2 parameters

During heating and cooling

During heating


IPE300 joints under natural fire

IPE550

30’ fire

Works also for the temperature of the upper flange

in the joint region

60’ fire


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