The Structural Engineer > Archive > Volume 66 (1988) > Issues > Issue 16 > The Effect of Combined Thermal and Force Loads on the Behaviour of Reinforced Concrete Beams
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The Effect of Combined Thermal and Force Loads on the Behaviour of Reinforced Concrete Beams

Results are reported of tests performed on reinforced concrete beams subject to thermal and short-term force loads. Simply supported beams were force loaded to collapse, and it was found that heated and unheated specimens did not exhibit significantly different ultimate moment and rotation capacities. Continuous beams were thermally loaded without force load. Beams which had been precracked by force loading produced thermal reactions which were 50-65 % of those measured on similar, initially uncracked beams. Although designed for moment redistribution, no significant reduction in ultimate loadcarrying capacity could be detected when the heated continuous beams were subsequently loaded to collapse. All ultimate loads were within 8 % of their equivalent unheated values. It is concluded that no significant reduction in the ultimate load capacity occurred as a result of coexistent thermal loading. J.G. Church and L.A. Clark