BEHAVIOR OF ISOTROPIC R/C BRIDGE DECKS ON STEEL GIRDERS

An experimental and analytical investigation was conducted regarding the behavior of Ontario-type reinforced concrete bridge decks. A full-scale bridge deck (both cast-in-place and precast), detailed in accordance with the Texas Department of Highways provisions for Ontario-type decks, and having about 60% of the reinforcement required by the current AASHTO code, performed well under current AASHTO design load levels. Under service and overload conditions (about three times the current AASHTO design wheel load), the behavior of the deck slab was essentially linear. Membrane forces did not noticeably affect the performance of the bridge prior to deck cracking. After cracking, significant compressive membrane forces were present in the deck, and could significantly increase its flexural capacity. Detailed finite element models of the specimen were developed for both the cast-in-place and precast panel deck cases. Cracking of the deck was followed using sequential linear analyses with a smeared cracking model. Analytical predictions agreed well with experimental results.

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