Creep Deflection of Reinforced Concrete Beams

by Charles A. Miller, (M.ASCE), Asst. Prof. of Civ. Engrg.; City Coll. of New York, New York, NY,
Sidney A. Guralnick, (M.ASCE), Professor of Civil Engineer; Illinois Inst. of Technol., Chicago, IL,

Serial Information: Journal of the Structural Division, 1970, Vol. 96, Issue 12, Pg. 2625-2638

Document Type: Journal Paper


A procedure is outlined for predicting the time-dependent deflection of statically determinate, singly reinforced concrete beams subjected either to long-term sustained load or to repeated cycles of sustained load. Creep behavior of plain concrete is represented by means of a linear viscoelastic model. Numerical solutions are obtained for the resulting system of equilibrium equations; graphs giving peak values of deflection, neutral axis location, and concrete and steel stresses are presented. The time history of each variable is fitted with an exponential, and nomographs are given to define the values of the exponents. A procedure is presented for using this data to compute the response of beams subjected to cycles of sustained load.

Subject Headings: Load factors | Concrete beams | Repeated loads | Displacement (mechanics) | Reinforced concrete | Time dependence | Creep | Viscoelasticity

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