Analysis of Restrained Reinforced Concrete Columns Under SUSTAINED LOAD


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Title: Analysis of Restrained Reinforced Concrete Columns Under SUSTAINED LOAD

Author(s): Robert F. Manuel and James G. MacGregor

Publication: Journal Proceedings

Volume: 64

Issue: 1

Appears on pages(s): 12-24

Keywords: beams (structural); building codes; columns (structural);computation; creep (materials); deflection; frames; reinforced concrete; stablity; structural analysis; structural engineering.

Date: 1/1/1967

The primary objective of this investigation was the derivation of a method of analysis which can be used on a computer to determine the behavior of columns in reinforced concrete frameworks under sustained load. The method of analysis applied discreteness to the cross sections, the member lengths, and the duration of sustained load, and utilizes numerical integration and trial and error procedure to obtain equilibrium configurations of the frameworks under load. A nonlinear stress-creep strain function was considered using the rate of creep method to estimate the creep of the concrete under variable stress. The applicability of the analysis was partially verified by comparison with experimental data reported by various investigators. The analysis was used to study the sustained load behavior of two series of laterally restrained beam column frames and the results were compared to three building codes.