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Title: Time-Dependent Behavior of Reinforced Concrete Columns

Author(s): R. M. Samra and W. L. Gamble

Publication: Symposium Paper

Volume: 117


Appears on pages(s): 113-146

Keywords: columns (supports); computer programs; cracking (fracturing); creep properties; deformation; reinforced concrete; shrinkage; structural analysis; Structural Research

Date: 10/1/1989

A rational method of analysis is developed that can be used on a computer to determine the behavior of reinforced concrete columns under sustained service loads. At specific time intervals, trial-and-error procedures are used to establish strain compatibility and equilibrium conditions at each of several cross sections of a member. Curvatures are integrated to find the deflected shape, and an iterative approach is used to find the stable deflected shape if there are secondary moments. The analysis calculates the effect of creep on the stress redistribution between concrete and steel and on the deflections of members subjected to variable axial loads and variable moments. The effects of shrinkage and cracking are also included. The applicability of the analysis is partially verified by comparison with laboratory and field investigations reported by various researchers. In most cases, a good correlation is obtained between the analytical results and the measured results.


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