METHOD TO DETERMINE STEEL BUILDING BEAM FIRE RESISTANCE Russian patent published in 2008 - IPC G01N25/50 

FIELD: fire-fighting, particularly building structure fire safety.

SUBSTANCE: method involves performing nondestructive building beam testing to determine simple quality indexes by determination of geometrical steel beam dimensions and beam securing conditions; measuring normative working load applied to beam and intensity of normative stresses in weak metal beam sections; determining heat diffusion indexes of fire-protective material of the beam. Fire-protective beam resistance to heat applied from ordinary fire is given as function, which takes into consideration of normative force stresses intensity in beam cross-section caused by working normative load application and heat diffusion indexes of fire-protective material. Fire-resistance rating of fire-protected steel beams is determined from nomograph.

EFFECT: increased test reliability and decreased test time.

16 cl, 3 dwg