Retrofitting by Use of FRP

Abstract

The composite materials made of fibers in a polymeric resin, also known as fiber-reinforced polymers (FRPs), have emerged as an alternative to traditional materials for repair and rehabilitation. For the purposes of this document, an FRP system is defined as the fibers and resins used to create the composite laminate, all applicable resins used to bond it to the concrete substrate, and all applied coatings used to protect the constituent materials. The fibers and resins used in FRP systems are relatively expensive compared to traditional strengthening materials such as concrete and steel, however, it is cost efficient in terms of labor and equipment costs. One great advantage of FRP systems is that it can be used in areas with limited access where traditional techniques would be difficult to implement. FRP sheets can be wrapped around concrete columns to increase the strength. The procedure for applying FRP sheet is described in this chapter. This FRP increases the load capacity of the column and increases the deformation capability.