Improving the Durability of Impact Damaged PC Bridge Girders Using CFRP Rod Panel Retrofit

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Title: Improving the Durability of Impact Damaged PC Bridge Girders Using CFRP Rod Panel Retrofit

Author(s): Abheetha Peiris and Issam Harik

Publication: Special Publication

Volume: 331

Issue:

Appears on pages(s): 80-100

Keywords: CFRP, Impact Damage, Load Rating, Prestressed Concrete, Residual Capacity, Retrofit, Rod Panel

Date: 2/1/2019

Abstract:
An exterior girder of a prestressed concrete bridge over Interstate 65 in Kentucky was damaged due to an over-height truck impact. The damaged section spanned two of the three northbound lanes of the highway. Two prestressing strands were severed and two additional strands were damaged by the impact. In addition, shear reinforcing bars in the vicinity of the impact were cut-off. CFRP Rod Panels (CRPs) were deployed to restore some of the load carrying capacity lost due to the severed prestressing tendons. CRP 195, with CFRP rods of 3.96 mm (0.156 in) diameter, having a capacity of 867 kN (195,000 lbs.) per 305 mm (1 ft.) width of panel, was selected for the flexural strengthening. A triaxial braided quasi-isotropic CFRP fabric was selected for shear strengthening and served as containment of crushed concrete in the event of future over-height impacts. Since the ACI and AASHTO Codes or Guides do not directly address the design with CRPs, strain limits based on debonding of the rods similar to externally bonded CFRP (EB-CFRP) are imposed when determining the retrofitted beam capacity. The load rating evaluation of the impacted beam, the retrofit analysis and design, and the field repair stages are presented and discussed.