SEISMIC UPGRADES WITH CARBON FIBER REINFORCED POLYMER SHEETS
Due to the aging of infrastructure and the need for upgrading to meet more stringent design requirements, structural repair and strengthening have received considerable emphasis over the past two decades. At the same time, seismic retroﬁt has become at least equally important, especially in California's earthquake-prone areas. State-of-the-art strengthening and retroﬁt techniques increasingly utilize externally bonded carbon fiber reinforced polymer sheets (FRP), which offer unique properties in terms of strength, lightness, chemical resistance, and ease of application.
In terms of strength, carbon fiber increases the in-plane shear and out-of-plane flexural strength, and it has been used for years in various parts of the world for this purpose. Carbon fiber is inherently non-corrosive and lightweight, unlike steel. And the ease of installation makes FRP very cost-effective and an efficient alternative to more invasive techniques.
The preparation of the application area and accurate batching along with proper application are key factors in the execution of the FRP application. In addition to preparation and laydown observation, in-situ strength tests and laboratory materials testing are required.
Reliant Testing Engineers has extensive experience providing preparation and laydown inspection, and materials testing of "FRP" on various types of projects throughout California.