prediction of Initial Cracking and Crack propagation in Reinforced Models


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Title: prediction of Initial Cracking and Crack propagation in Reinforced Models

Author(s): James Chinn and Staley F. Adams

Publication: Journal Proceedings

Volume: 66

Issue: 6

Appears on pages(s): 457-463

Keywords: beams (supports) ; cracking (fracturing) ; models; photoelasticity; reinforced concrete;research; stress analysis.

Date: 6/1/1969

This investigation was undertaken to study the possibility of predicting both initial cracking and crack propagation in reinforced plastic models that simulate reinforced concrete beams. Photoelastic model analysis has not been used previously for predicting loads for initial cracking or stresses for crack propagation. The models were prepared by milling grooves in their sides and grouting reinforcing material into them. Using model analysis, the prototype loads to initiate cracks were predicted for seven simple reinforced concrete beams. Then precracked models were made using a sawing technique to study stress redistributions as the cracks progressed using a photoelastic interferometer. The stress analysis was limited to the elastic range in the models but was correlated with actual failures in six concrete beams. Behavior of the plastic models and concrete prototypes were quite similar. It is concluded that the technique can be used as a quantitative method for predicting initial cracking, propagation of cracks, and ultimate failure in concrete beams.