Evaluation of the performance of the decks is based on field monitoring reports, which give details of crack occurrence, spalling of the decks, and general condition of the bridge deck slab with actual field visit to various sites and comparing field behavior. A total of seven isotropic and six conventional AASHTO decks were constructed. Each isotropic deck constructed had a matching counterpart (control) designed with AASHTO standards and was inspected along with those designed using empirical procedures after the first, third, and fifth year of construction. They were evaluated over a five-year period. The Pennsylvania Department of Transportation conducted field demonstration projects in which bridge decks were designed. Therefore, shear and temperature governs the amount of reinforcement needed.
The arching effect causes the deck slab to fail in punching shear rather than flexural failure, which is the basis of the design of conventional American Association of State Highway and Transportation Officials (AASHTO) deck slabs. As a result, the steel reinforcement experiences insignificant flexural stress. The fundamental concept in the isotropic deck design is based on the "arching" effect, which takes place in the concrete deck between the short spans of the beams.
This report describes the work done with alternate means of designing deck slabs by reducing the amount of reinforcement, without sacrificing the integrity of serviceability and strength of the decks, which could result in considerable cost reduction and efficient solution. PERFORMANCE OF CONCRETE BRIDGE DECK SLABS USING ISOTROPIC AND STANDARD AASHTO PROCEDURES
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