Damage control of intumescent painting, Influence of imperfections in intumescent painting

Tom Molkens


From daily experience we know that, after erection of a steel structure, damage often occurs on steel columns and beams due to transport and assembly work.  In combination with intumescent painting it is normal practice that after some time all paintwork will be touched up and repaired if needed.  The problem today is that at that most of the time, steel cladding is already placed and the external parts of columns and beams cannot be reached anymore and stay therefore (partially) damaged.

With the aid of thermoplastic calculation for some case studies, where the outer flange is partially loaded with an external fire instead of an ISO834 fire, we could define how big the damaged area may be and where it could be positioned without influence on the structural integrity of the protection.  Until today the SAFIR calculations are done for a R30 protection.

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