EFFECT OF VARIATION OF AGGREGATE GRADATION ON MODEL CORRELATION.
PITTSBURGH UNIV PA
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The load-strain curves of the prototypes for both the steel and concrete were accurately represented by the model beams. The aggregate gradation variation had no significant effect on the correlation. The loaddeflection curves of the model beams failed to represent the prototype beams as based on model theory. Prototype deflections averaged 2.2 times the model deflections instead of four times as indicated by model theory. Alami found that models with a linear scale as low as .334 satisfactorily correlated deflections. This investigation used models having a linear scale of .25. This tends to indicate that a lower limit on linear scale exists which will correlate deflections. The two methods used to locate the neutral axis, namely, from concrete and steel strains, and by measuring elongations about the neutral axis with the Whitmore gage, were in close agreement. The neutral axis location in the prototype series was closely represented by all model series. Author