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Thomas, P.H., 1954. A NOTE ON THERMAL STRESSES IN BEAMS AND SLABS. Fire Research Notes 142
The conventional equations determining thermal stress in beams heated from the top or bottom surface are quoted and the stresses are evaluated for the condition of heating obtained by suddenly raising the temperature of surface to a steady value. It is shown that even in a reinforced concrete beam failure may result from the attainment of high stresses rather than from failure due to the reaching of a temperature at which the matarials lose their strength.