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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.

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

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  1. 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

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

  3. 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

  4. IPE300 IPE550 30’ fire Works also for the temperature of the upper flange in the joint region 60’ fire

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