Abstract
An experimental study was conducted to investigate the behavior of composite concrete beams damaged and cracked under pure torsion, and then repaired by external strengthening. This was achieved using high strength Carbon Fiber Reinforced Polymer (CFRP) laminates bonded with epoxy four composite modify reactive powder concrete (MRPC) I-beams. Different types of section (Solid & with opening) were tested to obtain the effect of amount of CFRP laminate on beams ultimate torque behavior, angle of twist and failure modes. The results obtained showed that a significant effect of external high strength CFRP laminates on effectively restore of section solid, the range of 89.8% to 91.2% of ultimate torsional strength effectively restored as well as effectively restoring of section opening by 83.48% - 86.67% of ultimate torsional strength. The repaired beams give high efficiency in ultimate torsional strength, and indicate that the adopted technique gives a good torsional strength.
Highlights
The external bonding of high-strength Fiber Reinforced polymer (FRP) to structural concrete members has widely gained popularity in recent years, in rehabilitation works and newly builds structure
This was achieved using high strength Carbon Fiber Reinforced Polymer (CFRP) laminates bonded with epoxy four composite modify reactive powder concrete (MRPC) I-beams
Based on the results obtained from the experimental work, the following conclusions can be stated: 1) The repaired beams give high efficiency in ultimate torsional strength, and this means the adopted technique gives good torsional strength
Summary
The external bonding of high-strength Fiber Reinforced polymer (FRP) to structural concrete members has widely gained popularity in recent years, in rehabilitation works and newly builds structure. Comprehensive experimental investigations conducted in the past have shown that this strengthening method has several advantages over the traditional ones. The use of fiber reinforced polymer (FRP) materials in civil infrastructure for the repair and strengthening of reinforced concrete structures and for new construction has become common practice. The most efficient technique for improving the shear strength of deteriorated RC members is to externally bond fiber-reinforced polymer (FRP) plates or sheets [1]. The materials used in FRP, for example, fiber and resins are relatively expensive when compared with traditional materials, noting that the prices of equipment for the installation of FRP systems are lower in cost [3]
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