Proposed criteria for defining load failure of beams, floors, and roof constructions during fire tests

A .brief acc?unt is prese nte ~ of procedures use.d in development of criteria for d efining the pomt at ~hlCh fire test speCImens faJl to sus tam load durmg test.It is proposed that b.oth a deflectl~n of D j800d and an hourly rate of deflection of D j150d be taken as an indicabon of load faIlure.In these formulas, L is the span between s upports of the member or element found to be crItlcal under fire exposure, and d is the distance between upper and lower extreme fibers of the partlCular structural component or assembly.