Abstract
Ultra High Modulus (UHM) Carbon Fiber Reinforced Polymer (CFRP) laminates were used to strengthen the KY 32 Bridge over Lytles Creek, located in Scott County KY. The bridge is a single span steel girder bridge with a non-composite reinforced concrete bridge deck. An AASHTO load rating analysis showed that the maximum inventory level load rating of the bridge was 101.4 kN (11.4 tons) for a Type 1 truck load. In order to utilize the laminate efficiently, shear studs were post installed between the steel girders and the concrete deck as a method of developing composite action and also strengthening and increasing the load rating for the bridge. Following the placement of the shear studs, the inventory level load rating increased to 238.4 kN (26.8 tons) for a Type 1 truck load, an increase of 135% in load rating capacity. Two 20 ft. strips of UHM CFRP laminates 1.2 mm (0.047 in) thick and 50 mm (2 in) wide were applied to the top and bottom of the bottom flange of the steel girders. Field tests were conducted before and after the installation of the shear studs and also after applying the UHM CFRP laminates in order to determine the increase in the load carrying capacity and the reduction in maximum deflection at each stage of strengthening. A reduction in deflection of more than 5% at mid span is seen due to the CFRP laminates.
| Original language | English |
|---|---|
| State | Published - 2012 |
| Event | 6th International Conference on FRP Composites in Civil Engineering, CICE 2012 - Rome, Italy Duration: Jun 13 2012 → Jun 15 2012 |
Conference
| Conference | 6th International Conference on FRP Composites in Civil Engineering, CICE 2012 |
|---|---|
| Country/Territory | Italy |
| City | Rome |
| Period | 6/13/12 → 6/15/12 |
Keywords
- Bridge decks
- CFRP
- Field testing
- Laminate strengthening
- Steel girders
ASJC Scopus subject areas
- Polymers and Plastics
- Civil and Structural Engineering