Validation of Prestressed Concrete I-Beam Deflection and Camber Estimates

Status:  Complete
Report Date:  06/18/2012


Researchers developed a new method for predicting the release and erection cambers of Minnesota bridge girders by investigating the factors affecting their accuracy, including thermal effects, concrete strength and stiffness, solar radiation, relative humidity, concrete creep and shrinkage, length of cure and storage conditions. They developed prediction methods that on average improved release camber prediction accuracy from 74 percent to 99 percent, and erection camber prediction accuracy from 83 percent to 95 percent.

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