Accuracy of Models Used in Research on Reinforced Concrete

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Title: Accuracy of Models Used in Research on Reinforced Concrete

Author(s): Zuheir Y. Alami and Phil M. Ferguson

Publication: Journal Proceedings

Volume: 60

Issue: 11

Appears on pages(s): 1643-1664

Keywords:

Date: 11/1/1963

Abstract:
Three series of beam models were tested to fail in Three series of beam models were tested to fail in diagonal tension, two series were tested with beams two series were tested with beams expected to fail in bond, and one series consisted of beams expected to fail in bond, and one series consisted of beams tested to fail in flexural compression. All specimens were tested to fail in flexural compression. All specimens were loaded to failure. loaded to failure. Ultimate stresses at failure within each series were Ultimate stresses at failure within each series were compared with the values predicted from model theory. compared with the values predicted from model theory. The center deflections of the model beams. the compression The center deflections of the model beams. the compression strains, and the average distance between moment cracks were compared (in some series) with values predicted by model theory from the corresponding prototype. Models failed to predict the behavior of their prototypes when bond was the primary or secondary reason for failure . W hen flexural compression or shear failure is expected, without complications from bond splitting, models with scales of 0.9 to 0.3 closely predict the prototype behavior. The smallest beam of each series consistently showed slightly higher strength. Load-deflection and load-strain curves for prototypes can be predicted from models with scales as small as 0.334. Only approximate similitude of the average distance between moment cracks was obtained; differences of the order 9 to 97 percent were found.