Abstract
This paper presents results from experiments on aged and seriously damaged reinforced concrete (RC) beams strengthened with different arrangements of external carbon fiber-reinforced polymer (CFRP) laminates and end anchorages. Seven RC beams from an old bridge, measuring 250 × 200 × 2300 mm, were tested. All specimens were loaded to yield load to evaluate initial mechanical properties. Then, these seriously damaged specimens were repaired using different CFRP-reinforcing schemes and reloaded to failure. The yield load growth due to CFRP reinforcement ranged from 5% to 36%. Different parameters including CFRP dimension and position, bonding length, and end anchorage were investigated and facilitated conclusions on beam ductility, load-midspan deflection response, and failure mode. This research contributes to knowledge about the CFRP repair of aged and seriously damaged beams to ensure better performance in overloaded conditions.
Highlights
Reinforced concrete (RC) is one of the most widely used building materials in civil engineering applications
Erefore, the main objective of this study was to examine the effectiveness of different Carbon fiber-reinforced polymer (CFRP) sheet arrangements and end anchorages for improving the performance of aged and seriously damaged RC beams
Effect of CFRP Sheet Dimension and Position. e load capacity growth was greatly influenced by the dimension and the position of the strengthened CFRP sheet [23]. e percent increase of yield load could be evaluated as follows: αyield fstr − fbef fbef where αyield the percent increase of the yield load, fstr the yield load after strengthening (MPa), and fbef the yield load before strengthening (MPa)
Summary
Reinforced concrete (RC) is one of the most widely used building materials in civil engineering applications. Premature debonding failure due to separation of laminates has been shown to be the main problem of this method due to excessive stress concentration at the end of laminates [11] Such failure can be avoided using different anchorage systems [12, 13]. In addition to above studies, some laboratory experiments have been conducted on newly cast specimens to investigate the mechanical properties of damaged beams [18, 19]. Advances in Materials Science and Engineering [20, 21] These studies focused on the mechanical performance of RC members that were slightly damaged. Erefore, the main objective of this study was to examine the effectiveness of different CFRP sheet arrangements and end anchorages for improving the performance of aged and seriously damaged RC beams
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