The effect of elevated temperatures on the strength and stiffness properties of four reinforcing and three prestressing steels of varying size, manufactured to British Standard specifications, has been investigated. To simulate the temperatures likely to be experienced by the steel during a fire, a temperature range of 20° to 700° was adopted. The steels were tested in their 'as manufactured' condition in a purpose-built, tensile testing machine with tube furnaces and associated recording instrumentation. The test programme was designed to provide data on three major strength parameters-yield (or 0.2 % proof) stress, ultimate strength, and elastic modulus. Using the datu it is possible to assess the deterioration in strength of a structure during a fire and its residual strength at ambient temperature after a fire.
M. Holmes, R.D. Anchor, G.M.E. Cook and R.N. Crook