Field Performance Evaluation of Multiple Fiber-Reinforced Polymer Bridge Deck Systems Over Existing Girders--Phase I
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Field Performance Evaluation of Multiple Fiber-Reinforced Polymer Bridge Deck Systems Over Existing Girders--Phase I

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      Final Report
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      The research work presented in this report is focused on the experimental evaluation of fiber reinforced polymer (FRP) deck systems, which have been used on two side-by-side bridges on Route 49 in Dayton, Ohio. The long spans of the bridges allowed evaluation of FRP deck systems from four FRP deck manufacturers under similar loading and environmental conditions. The first phase of the project, reported herein, focused on the performance criteria and extensive laboratory testing. The objectives of Phase I of the project were to: (1) Assess the performance criteria developed by the Ohio Department of Transportation for FRP deck systems; (2) Evaluate the mechanical properties of the FRP deck materials; (3) Evaluate the bending and shear stiffness of the FRP deck panels; (4) Evaluate the ultimate strength response of the FRP deck panels; (5) Evaluate the fatigue response of the FRP deck panels on steel girders at high and low temperature; and (6) Evaluate the environmental durability of the FRP deck materials. The fabricators provided FRP material coupons representative of the deck systems. The coupons were laminates with the same type of multi-axial reinforcement, fiber content and resin system that were used for the deck panels. The following properties were measured: tensile strength and tensile modulus in the longitudinal and transverse directions and interlaminar shear strength in the longitudinal direction. The materials were found to be consistent in their properties and the coefficients of variation are relatively small. Environmental durability tests were performed, and the results were analyzed based on the criteria of the HITEC panel on FRP composite bridge decks. The HITEC evaluation criteria establish minimum levels of retained properties after exposure to the accelerated environmental exposure conditions covered in this report. The HITEC panel's minimum levels of retained material properties after 38 months of accelerated aging are as follows: 85% retention of the average as-received test values and 75% retention of each individual as-received test value. The environmental exposure and durability study served to discriminate the FRP materials that satisfied the durability requirements. Deflection limits of FRP panels were determined and, based on the deflection of conventional reinforced-concrete decks subjected to a simulated AASHTO HS25-44 design load with an impact factor of 30%, the results were analyzed. The deflection of the conventional reinforced-concrete deck was obtained from analysis following the standard AASHTO procedure for design. The deflection limits were applied in the static tests of FRP panels for three different simply supported spans and one continuous span. Strain limits in the FRP panels subjected to AASHTO HS25-44 design load with an impact factor of 30% were based on 20% of ultimate strains computed from tensile tests. These strain limits measured in the material coupon tests were correlated with the strains measured in the static tests of the FRP panels.
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