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 PowerPoint PPT Presentation


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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

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

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


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

New « Heat exchange » method for T in the upper flange.


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

  • Given by an equation obtained from curve fitting

  • with numerical results

  • based on Annex A of EN 1991-1-2 parametric fire curves

Contains 2 parameters

During heating and cooling

During heating


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

IPE300

IPE550

30’ fire

Works also for the temperature of the upper flange

in the joint region

60’ fire


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