Abstract
The use of external strengthening by fiber reinforced polymer (FRP) technology has significantly increased in recent decades. This is because (FRP) has the properties that make it the most suitable option for strengthening and rehabilitation of damaged concrete structures instead of using traditional materials such as steel plates. In this paper, the behaviour of non-reinforced concrete beams externally wrapped with Glass Fiber Reinforced Polymer (GFRP) sheets has been examined. Fourteen unreinforced concrete prisms were cast with a rectangular section of (150 × 125 mm) and a length of (760mm), these specimens were divided into five group. First group was not externally wrapped with GFRP sheets (control specimens), and the remaining groups were GFRP wrapped with a variable number of GFRP layers (thickness of wrapping). In the first stage of study, the prisms have been tested and the effect of external wrapping and increasing the wrapping thickness on the behaviour of prisms was observed. In the second stage, the unwrapped concrete prisms that were tested and failed (control specimens) were rehabilitated by externally wrapping them with one layer of GFRP sheets. The results have shown that wrapping with GFRP sheets increased the capacity of the prisms and failure load had reached to (342.5%) for prisms wrapped with three layers when compared to the control specimens. It was also noticed that there was an increase in the toughness of the prisms by increasing the number of GFRP layers. The results have shown that there was a decrease in the failure load of the four layer wrapped prisms, and this was due to the early failure of the prisms due to the debonding of the GFRP sheets from the prism surface. The damaged specimens which were later rehabilitated have shown an increase in load carrying capacity compared to the control specimen.
Highlights
The use of fiber reinforced polymer (FRP) to strengthen reinforced concrete structures has grown and become a known technique
The results showed that when FRP sheets are used properly and proper bracing in concrete beams, there will be a marked increase in shear and flexural strength
RESEARCH SIGNIFICANCE The purpose of the current research is: 1- To study the effect of strengthening of concrete prisms by using U-shaped Glass Fiber Reinforced Polymer (GFRP) sheets on the flexural strength of concrete prisms. 2- To Study the effect of increasing the number of GFRP layers on the flexural strength of prisms. 3- To Repair the failed concrete prisms with GFRP sheets
Summary
The use of fiber reinforced polymer (FRP) to strengthen reinforced concrete structures has grown and become a known technique. Many of the practical investigations conducted in the past have shown that the use of polymer fiber in the strengthening has several benefits compared to conventional methods, this is because of their high strength, low weight and improved durability [2]. There are three known types of polymer fiber used in the civil structures namely glass, aramid, and carbon fiber. The physical and chemical properties of these fibers vary from one type to another and differ for the same fiber type [3]. Meisam et al.[5] Conducted experimental study to investigate the effect of FRP strengthening on
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