United States Department of Transportation
i
Instantaneous and Time-Dependent Deflections of Simple and Continuous Reinforced Concrete Beams
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1963-01-01
[PDF-31.04 MB]
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Abstract:Presented in this report is a study of instantaneous and time-dependent deflections of simple and continuous reinforced concrete beams with particular emphasis on effects of cracking, continuity, shrinkage warping and steel percentage. A study of the pertinent factors affecting both initial and time-dependent deflections of reinforced concrete flexural members is made, and a summary of existing methods, guides and rules of thumb for predicting these effects presented. A new and practical method is presented for computing shrinkage warping which agrees more closely with test data than previous methods advanced. A number of observations are made with regard to the experimental curvatures and deflections obtained which refer to the effects of steel percentage, cracking and the phenomenon of the shifting neutral axis with time on deflections. A detailed analysis is made of the effects of cracking on deflections and recommended design procedures presented for predicting these effects. A method is demonstrated for including the effect of moment redistribution due to cracking in computing deflections of statically indeterminate beams. Deflections computed by these procedures compared reasonably well with the experimental data obtained in this investigation and other data on deflections of simple and continuous reinforced concrete beams.
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