The Structural Engineer > Archive > Volume 13 (1935) > Issues > Issue 9 > Stresses in the Steel Reinforcement of Reinforced Concrete Structures
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Stresses in the Steel Reinforcement of Reinforced Concrete Structures

In the design of reinforced concrete structures certain assumptions are made which are known to be unfulfilled in practice. It is usual when designing for specified working loads to use formulae based on a linear relation between stress and strain or a constant modulus of elasticity for concrete. This assumption, though true for steel within the limit of proportionality, is known to be incorrect for concrete and other building materials and has resulted in much controversy. Furthermore, while the value of the modulus remains sensibly constant for all steels, that for concrete varies considerably with the richness of the mix, quality of the aggregates, water-cement ratio, age at testing, methods of curing and of loading, range of stress and with the interval of time during which the concrete is under stress. It is therefore desirable to examine the effect of a change in the assumed value of the modular ratio on the calculated stresses and deflections of reinforced concrete members. R.H. Evans

Author(s): Evans, R H

Keywords: reinforcement;reinforced concrete;stress;creep;time;effects;research;stirrups;floors;beams