Abstract
Textile-reinforced mortar (TRM) is a strengthening material in which textiles are attached to reinforced concrete (RC) structures using an inorganic matrix. Although many studies on structural behavior, various factors that affect TRM behavior could not be determined clearly. Especially, the uncertainty in bonds due to inorganic materials was not considered. In this study, the flexural behavior of TRM-strengthened beams was determined considering intermediate crack debonding occurred. The TRM beam strengthening limit and TRM coefficients were defined considering the possibility of premature failure and experimental results of four other research on 22 specimens. Therefore, it is expected that a conservative design would be possible when the suggested strengthening limit coefficient is applied.
Highlights
Various materials and methods exist for strengthening reinforced concrete (RC) structures
To overcome the disadvantages of using organic materials and maintain the mechanical characteristics of fiber reinforcement, which is advantageous for structural reinforcement, the strengthening method with textile-reinforced mortar (TRM) using inorganic materials has been actively studied [3,4,5,6,7]
A wide variety of flexural behavior evaluation methods for TRM beams are presented according to their design factors, but they assume a perfect bond between the TRM reinforcement and concrete substrate until the ultimate stage
Summary
Various materials and methods exist for strengthening reinforced concrete (RC) structures. Fiber slips have been reported because of inefficient bonding between the textile and matrix To solve this problem, a study was conducted to investigate textiles reinforced by impregnation or coating with organic materials such as epoxy [24,25,26]. A wide variety of flexural behavior evaluation methods for TRM beams are presented according to their design factors, but they assume a perfect bond between the TRM reinforcement and concrete substrate until the ultimate stage. These assumptions cannot consider the uncertainty in bonds due to the use of inorganic materials and do not reflect the behavior of TRM beams under service load [27,34]. Park et al [34]
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