| This thesis addresses the calibration methodology for Load Factor and Resistance Design (LRFD) flexural resistance factors for the use of fiber reinforced polymers (FRP) as a concrete prestressing material and estimated long-term deflection multipliers for FRP prestressed girders. Existing bridges, utilizing precast prestressed construction with a range of girder types, spans, and spacing were redesigned using Aramid (AFRP) and Carbon (CFRP) prestressing tendons. Monte Carlo Simulations were utilized, based on the trail designs, to provide reliability based statistical distributions for structure capacity using the recommended design methodology from the American Concrete Institute (ACI) Report 440.4R-04. Capacity distributions were used in two independent calibration procedures for resistance factors. Resistance factors were calibrated for target reliability indices of 2.5, 3.0 and 3.5; for compression-controlled and tension-controlled failure types. Recommended resistance factors were found to be dependent on failure type considered for the beam and not FRP material. Recommended long-term deflection multipliers of FRP prestressed girders were provided for AFRP and CFRP prestressed girders for composite and non-composite construction. |
