The Structural Engineer > Archive > Volume 51 (1973) > Issues > Issue 11 > The Deflexion of Reinforced Concrete Beams Under Fluctuating Load with a Sustained Component
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The Deflexion of Reinforced Concrete Beams Under Fluctuating Load with a Sustained Component

An experimental investigation on reinforced concrete beams undertaken to determine the influence of fluctuation of loading on deflexions is described. The beams were subjected to a range of loading regimes usually with a fluctuating component. A linear logarithmic relationship was found between the increase in maximum deflexion and the number of fluctuations or the length of time under load. Increases in deflexion of beams under fluctuating loads were about the same as for beams subjected to sustained load equal in magnitude to the maximum of the fluctuation. The results are related to present design criteria and methods of analysis for deflexions of reinforced concrete structures and the implications for design are discussed. P.R. Sparks and J.B. Menzies

Author(s): Sparks, P R;Menzies, JB

Keywords: deflection;cyclic loads;reinforced concrete;beams;behaviour