This report describes the results of overload tests on two 1/8th scaleprestressed concrete bridge girders. The three span continuous girderswere made with three pretensioned I-section girders, and were made continuousfor live loads by means of reinforcement in the composite cast-in-placedeck. The structures were originally built as part of a study of the long-termbehavior of prestressed concrete bridges.The structures were loaded with a model HS-type vehicle loading whichwas positioned to produce either high shears or approximately maximum momentsin the various spans. The final tests produced very large deformations!» andthe maximum loads reached were in the range of 93 to 99 percent of thetheoretical collapse loads.The behavior of the structures is described in terms of measured load deflectionand load-reaction curves, together with descriptions of thecracking that occurred as a result of the several loadings. Comparisonsof measured and computed deflections, reactions, and cracking moments aremade. The service-load deflections were generally smaller than expected, andthe cracking moments larger than expected.
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