Fire resistance and fire hazard study of combined metal-timber structures

Introduction. Due to the increasing popularity of timber housing construction, new timber structures with unstudied properties appear provided with no fire safety standards of their use.

Aim: to obtain data on fire resistance and fire hazard of combined metal-timber structures, used in floors of residential and public buildings.

Materials and methods. In the study, a fragment of a combined metal-timber floor structure with a size of 4300 × 2000 mm and a thickness of 160 mm was tested using the methods for determining fire resistance and fire hazard classes.

Results. According to the test results, uncoated samples under a vertical uniformly distributed load of 520 kg/m2 were classified as REI 60, while the Evrika fire retardant, applied to samples from the outside at a consumption of 500 g/m2, has improved their fire resistance to REI 90. The fire hazard class of uncoated samples and coated with fire retardants corresponds to K3(15) and K0(15), respectively.

Conclusion. New experimental data will be used in the preparation of amendments to SP 64.13330.2017 “SNiP II-25-80 Timber Structures” for ensuring regulatory fire safety requirements to these structures.

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