Testing of Reinforced Concrete Bridges for External Reinforcementby Srinivasa L. Iyer, South Dakota School of Mines &, Technology, United States,
C. Sivaramakrishnan, South Dakota School of Mines &, Technology, United States,
S. Atmaram, South Dakota School of Mines &, Technology, United States,
Abstract: Several continuous reinforced concrete slab bridges were constructed in the 1950's with spans ranging from 30 ft. to 60 ft. Longitudinal cracks were observed in the tension zone (bottom of slab) close to the wheel tracks. A study by South Dakota School of Mines and Technology on the model bridge has revealed that these cracks were developed due to dynamic loads and vibration of the bridge structure under moving loads. A deficiency of steel in the transverse direction might have aggravated this situation further. Rehabilitation of these bridges was studied by jacking the slab bridges to provide partial prestress and providing extra reinforcements by means of steel plates (strips) or advanced composite sheets bonded to the bottom of the slab.
Subject Headings: Concrete bridges | Reinforced concrete | Bridge tests | Concrete beams | Slabs | Material tests | Steel bridges | Dynamic loads | North America | South Dakota | United States
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