Tests of Rigid Frame Bridge Model to Ultimate Load
D. H. Pletta, Arpad A. Pap, and ching-Sheng Wu
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A one-tenth scale model forced concrete rigid of an existing skewed frame bridae was constructed rein-and tested both within the elastic range and UD to initial cracking in the concrete and then to ultimate ‘load. The model was fabricated of reinforced concrete using ‘/8 in. deformed reinforcing. A total of 57 SR-4 rosette gages were used to measure strains on the surface of the concrete at selected positions. Additional 108 SR-4 gages were fastened to the steel reinforcing. Deflections were measured at 11 points of the deck, and horizontal reactions determined by suitable dynamometers. Part of the strain data was converted to unit stress for several loadings. Concentrated loadings located at or near the center of the deck produced large local strains, especially in tension. The model was essentially elastic up to about one-third ultimate load and failed in the abutment at the knee.