Abstract
This paper addresses the mechanics of adhesion, strengthening effect and durability issues of applications of CFRP composite materials in beams. The application of CFRP materials has been widely described, but the main focus has been on overall failure parameters. The first issue is strengthening capability of CFRP reinforcement for concrete beams. The second is the local interface bond stress-slip relationship, that is, the local t-slip. The last issue is the durability of the CFRP sheet/plate, when exposed to a hydro-thermal environment. The role of adhesion and the mechanics of concrete-CFRP adhesion and a sound understanding of the interface between the CFRP and concrete behavior is the key factor for controlling debonding failures in CFRP-strengthened RC beams.
Highlights
During the last four decades, the development of materials from the theoretical and technological points of view of advanced composite materials have resulted in an expanded use
Steel plates were employed and more recently, attention has been directed towards the use of carbon fiber reinforced plastic composites (CFRP) plates, which offer higher strength/weight, and several attractive attributes mentioned before and an improved durability over their steel counterparts
These advanced composites are being considered as a replacement to the conventional steel in reinforced concrete structures due to a continuing decrease of the cost of Carbon Fiber Reinforced Polymer (CFRP) materials and the development of synthetic adhesives based on epoxy resins
Summary
During the last four decades, the development of materials from the theoretical and technological points of view of advanced composite materials have resulted in an expanded use. Steel plates were employed and more recently, attention has been directed towards the use of carbon fiber reinforced plastic composites (CFRP) plates, which offer higher strength/weight, and several attractive attributes mentioned before and an improved durability over their steel counterparts These advanced composites are being considered as a replacement to the conventional steel in reinforced concrete structures due to a continuing decrease of the cost of CFRP materials and the development of synthetic adhesives based on epoxy resins, The discussion is kept on a descriptive level and the reader is advised to refer to the cited references for details of parameters and mathematical models Parameters such as strength on the average bond strength and the force transfer from the composite plates to the concrete were studied by Chajes, M.J. et al, (1996). They found that there is an effective bond length for a joint beyond which no further increase in failure load can be achieved
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