Analysis of the mechanical properties of Peltophorum vogelianum post-actual fire

• DOI: 10.22533/at.ed.3172202213097

• Palavras-chave: Fire. High temperature. Carbonization. Wood. Mechanical properties.

• Keywords: Fire. High temperature. Carbonization. Wood. Mechanical properties.

• Abstract:

  The present work analyzed pieces of wood from the roof structure of a house that suffered a fire in the city of Itapeva, in the interior of São Paulo. The roof structure was built 25 years ago using wooden beams from the Guarucaia species (Peltophorum vogelianum). In general, the surface layer of coal formed in the structural elements subjected to fire preserved the mechanical properties of the core. The values ​​of shear strength (fv), compressive strength (fc0) and modulus of elasticity (Ec0) in compression parallel to the fibers for this species with an average density of 919 kg/m3, according to the Brazilian standard NBR 7190/97, are 15.5 MPa, 62.4 MPa, and 17212 MPa, respectively. In the tests carried out, the twelve specimens analyzed had values ​​close to and even higher than the normalized ones. With an average density of 815 ± 58 kg/m3, the samples had values ​​of 14.8 ± 3.0 MPa for shear strength (fv), 62.6 ± 11.0 MPa for strength values ​​(fc0) and 21751 ± 8230 MPa for the modulus of elasticity (Ec0) in compression parallel to the fibers. Despite the good results, due to the high coefficient of variation observed, it is recommended that wood subjected to fire not be reused for structural purposes.