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Your search keyword '"Al-Qaralleh, Mohammad A."' showing total 17 results
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17 results on '"Al-Qaralleh, Mohammad A."'

15. Effect of CFRP strengthening systems on the fatigue limit of reinforced concrete beams.

Author

Eljufout, Tamer, Toutanji, Houssam, and Al-Qaralleh, Mohammad

Subjects
CONCRETE beams, ENERGY dissipation, REINFORCED concrete, FLEXURAL strength, CARBON fibers
Abstract

This paper aims to study the effect of Carbon Fiber Reinforced Polymer (CFRP) strengthening techniques on the fatigue limit of Reinforced Concrete (RC) beams. An accelerated fatigue method was utilized to find the fatigue limit based on the hypothesis of linear cumulative damage as determined by the Palmgren-Miner rule. Six RC beams with dimensions of 152.4 × 152.4 × 1,520 mm were tested under monotonic and cyclic loading using a four-point bending configuration: two non-strengthened RC beams, two RC beams strengthened with Near Surface Mounted (NSM) CFRP rods, and two RC beams strengthened with Externally Bonded (EB) CFRP sheets. Strengthened RC beams had less stiffness degradation and more energy dissipation when compared to the non-strengthened RC beam. The NSM CFRP technique demonstrated a better monotonic flexural strength than the EB CFRP technique. NSM CFRP rods and EB CFRP sheets increase the fatigue limit when compared to the non-strengthened RC beam by 19% and 33%, respectively. [ABSTRACT FROM AUTHOR]

Published
2021
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17. Effect of Overloading on Fatigue Life of RC Beams Strengthened with FRP Sheets.

Author

Al-Qaralleh, Mohammad and Toutanji, Houssam

Subjects
CONCRETE beams, FIBER-reinforced concrete, REINFORCED concrete, STRENGTH of materials, CONCRETE fatigue, FLEXURAL strength
Abstract

Strengthening reinforced concrete (RC) beams with externally bonded fiber reinforced polymers (EBFRP) has gain interest in the civil engineering field in the past 3 decades. Numerous studies investigated the behavior of such strengthening system under monotonic loading. However, its fatigue behavior still lacks a comprehensive understanding. This study investigates the effect of regular overloading on the fatigue life of RC beams strengthened with EBFRP. This study includes 5 RC beams with dimensions of 152.4x152.4x1500 mm strengthened with 1 layer of Carbon (C) FRP attached to its soffits. One beam tested monotonically to serve as a reference and the others tested under four points flexural fatigue loading. The pattern of the fatigue loading was chosen to simulate the real-world loading on bridges. When compared to the literature; the results show that overloading alters the fatigue life of the strengthened beams. A narrow band of overloading that is equal or less than 120% the background loading enhanced the fatigue performance. While overloading greater than 140% of the background loading significantly reduces the fatigue life of the beams. [ABSTRACT FROM AUTHOR]

Published
2018
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