Structural Performance of RC Beams Strengthened with Prestressed Near-Surface-Mounted CFRP Tendons

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Title: Structural Performance of RC Beams Strengthened with Prestressed Near-Surface-Mounted CFRP Tendons

Author(s): Z. Wu, K. Iwashita, and X. Sun

Publication: Special Publication

Volume: 245

Issue:

Appears on pages(s): 165-178

Keywords: carbon fiber-reinforced polymer (CFRP) tendon; epoxy putty; near-surface mounted (NSM); polymer cement mortar; prestress

Date: 4/1/2007

Abstract:
Fiber reinforced polymer (FRP) composites have been widely used as externally bonded reinforcements to strengthen or rehabilitate deteriorated concrete structures. However, premature debonding failure due to the limitation of bond at the FRP-concrete interface is often encountered which limits FRP material potential for flexural strength increase. To minimize debonding failures and mechanical damage such as vehicular traffic and impact, etc., near surface mounted (NSM) FRP technology has emerged as another structural rehabilitation method. This study aims at evaluating a new strengthening using prestressed NSM carbon fiber reinforced polymer (CFRP) tendons. Although NSM FRP tendons are less susceptible to debonding than externally bonded FRP laminates, the load-carrying capacity of RC structures with NSM reinforcements is still likely to be governed by "premature" debonding failure. An experimental program with design variables such as prestress level and bonding agents was carried out to study the strengthening performance in terms of stiffness, cracking behavior and load-carrying capacity. The experimental results are presented and discussed in this paper. Experimentally validated bonding method is also proposed in this study.