Assessment of Seismic Rehabilitation and Repair of RC Bridges with CFRP Composites

An assessment of the effectiveness of the seismic rehabilitation of a bridge sub-assembly, and the repair of another with Carbon Fiber Reinforced Polymer (CFRP) composites is presented. The assessment is based on the results of in-situ tests carried out on two three-column bridge bents and the deck slab between them. The performance of the two bents is compared to that of an as-built bent; the as-built bent was tested first; the bent was then repaired using epoxy injection, shotcrete, and CFRP composites. A damage assessment and a performance assessment is made for the as-built, the rehabilitated, and the repaired bents in terms of the Caltrans Seismic Design Criteria for new bridges, and the Seismic Retrofitting Manual of existing bridges. Parameters include column shear strength, plastic hinge length, anchorage and splices of longitudinal reinforcement, and cap beam-column joint shear capacity. The demand was determined from seismic design spectra of the site for a 10% probability of exceedance in 50 years, 100 years, and 250 years earthquakes. Comparisons of demand versus capacity are made for the as-built and rehabilitated bent for the three earthquakes.

• INTRODUCTION

• SOUTH TEMPLE BRIDGE DETAILS

• CFRP COMPOSITE DESIGN FOR SEISMIC REHABILITATION

• DAMAGE ASSESSMENT

• PERFORMANCE ASSESSMENT

• CONCLUSIONS

• ACKNOWLEDGMENTS

• REFERENCES