Bridge column shear enhancement in California

When three bridges were found to have columns efficient in shear capacity, Caltrans opted for an innovative rehabilitation solution. As an alternate to steel jacketing, FRP was wrapped round the bridge columns. 

All three bridges were found to have spalled and unsound concrete. Because the shear deficiency extended the full height of the columns, it was necessary to excavate down to the footings. Scaffolding was erected to allow access to the full height for the FRP wrap. 

The columns were then painted with a UV finish coat to match the existing structure and provide protection from the detrimental UV rays. The solution saved Caltrans both time and money when compared to standard concrete steel jacketing, while achieving the structural strength needed to meet Caltrans’ needs.