DESIGN ECONOMICS OF HPC GIRDER BRIDGES PRESTRESSED WITH CFRP TENDONS

Surveys have indicated that between 30% and 40% of all bridges in North America are in urgent need of replacement or rehabilitation. New materials such as HPC and FRP could play a major role in the renewal of North America's bridges. Despite the potential benefits from the use of these materials, most designers and precasters are still reluctant to use them. This may be due to the increased initial cost and quality control required to produce these materials. It is unlikely that HPC and FRP will gain wide acceptance without a clear economic incentive. This paper presents a rigorous and systematic procedure using optimization techniques for the design of slab-on-girder bridges. The procedure is used to develop an optimization system that can be utilized to carry out cost effectiveness studies of the use of HPC and FRP prestressing tendons in the production of standard CPCI I-girders, and to develop preliminary design charts according to the CHBDC provisions.

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