Development of Hybrid FRP-Concrete Composite Compression Members

Abstract

The concrete-filled steel tubes have been widely used in buildings and civil structures. However the corrosion of the steel tubes results in the loss of load carrying capacities of the members and, therefore, there is a need for regular maintenance. To mitigate such maintenance issues and prevent the loss of load carrying capacity, FRP composite were suggested as the candidate material. A number of research works has shown that the use of FRP tubes produced by filament winding technique was very effective on the improvement of compressive strength of the concrete-filled FRP tubes (CFFT). However the filament wound FRP tubes did mot contribute to the increase of the flexural strength of a CFFT. In this paper, a new type of FRP tube which consists of several pultruded open sections assembled by filament winding technique is proposed to improve compressive strength as well as flexural strength of a CFFT. The load carrying capacity of proposed CFFT is discussed through the analytical investigation.

Experimental investigation on the structural behavior of concrete filled FRP tubes with/without steel Re-bar

“…Methods used in flexural strengthening include FRP re-bar and pultrusion FRP Ribs. These methods have been currently presented but are still in the early stages of the study and are considered rather elementary (Joo et al, 2007). Unlike flexural reinforcement using FRP, the Reinforced Concrete Filled FRP Tube (RCFFT) has already been applied to structural members in bridges (Salem, 2000).…”

Experimental Study of Flexural Performance of Reinforced Concrete Beams and Hybrid Beams

“…Increased mass production of FRP composites allowed these materials to be more actively used in buildings for various purposes; lightweight and high-resistant fiber reinforced composite materials began to be more widely used for strengthening, repair and renovation purposes in concrete buildings. In recent years, there is increased research on hybrid FRP columns filled with concrete or empty FRP pipes [4]. Scientific research clearly shows that the use of FRP composites in new buildings in the future will mainly focus on hybrid use.…”