The Structural Engineer > Archive > Volume 59 (1981) > Issues > Issue 3 > A Simple Aid for Predicting Shrinkage and Creep Strains in Buildings and Bridges
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A Simple Aid for Predicting Shrinkage and Creep Strains in Buildings and Bridges

The paper presents a simple design aid for predicting long-term movements up to 50 years in buildings and bridges made of normal and lightweight aggregate concrete. The method is based on the principle of superposition and a creep factor chart which takes into account varying sizes of members, age at loading, exposure conditions, and percentage of reinforcement; it requires only a knowledge of the 28-day cube strength and the loading history of the member. The method is developed from a study of in situ movements in two reinforced concrete structures subjected to incremental loading. The predicted load-induced and basic (i.e. elastic + shrinkage + creep) strains show excellent agreement with the measured strains in the two structures with an error coefficient within 11% at all ages. The method is shown to give good agreement with measured strains on normal weight and lightweight aggregate concrete columns reported from America, and on the Medway Bridge. R.N. Swamy and P. Arumugasaamy