Stressing State Analysis of Reinforced Concrete Beam Strengthened by CFRP Sheet with Anchoring Device

Abstract

This paper investigates the working performance of reinforcement concrete (RC) beams strengthened by Carbon-Fiber-Reinforced Plastic (CFRP) with different anchoring under bending moment, based on the structural stressing state theory. The measured strain values of concrete and Carbon-Fiber-Reinforced Plastic (CFRP) sheet are modeled as generalized strain energy density (GSED), to characterize the RC beams’ stressing state. Then the Mann–Kendall (M–K) criterion is applied to distinguish the characteristic loads of structural stressing state from the curve, updating the definition of structural failure load. In addition, for tested specimens with middle anchorage and end anchorage, the torsion applied on the anchoring device and the deformation width of anchoring device are respectively set parameters to analyze their effects on the reinforcement performance of CFRP sheet through comparing the strain distribution pattern of CFRP. Finally, in order to further explore the strain distribution of the cross-section and analyze the stressing-state characteristics of the RC beam, the numerical shape function (NSF) method is proposed to reasonably expand the limited strain data. The research results provide a new angle of view to conduct structural analysis and a reference to the improvement of reinforcement effect of CFRP.

Design and Analysis of Blast Resistant RC Beams for Concrete Structures at Off-Site Oil and Gas Plants

“…Sustainable Construction (WSCC 2022) strips, Mansoor et al [15] discovered that the use of CFRP laminates in shear enhancement increased the ultimate bearing capacity of the beam by 27.3 percent for double CFRP layers and decreased total deformation by 56%. Comparable findings were replicated in Luo et al [8] numerical study. In order to research on the yielding deformation capacity and maximum bearing capacity of the RC beams reinforced with the CFRP strips, Luo et al [8] investigated the impact performance of these beams, premised on the structural stressing state concept.…”

“…Comparable findings were replicated in Luo et al [8] numerical study. In order to research on the yielding deformation capacity and maximum bearing capacity of the RC beams reinforced with the CFRP strips, Luo et al [8] investigated the impact performance of these beams, premised on the structural stressing state concept. Consequently, the controlled beam and the reinforced beam were compared.…”

“…Many studies on the impact resistance of Reinforced Concrete (RC) beams have been carried out in various locations throughout the world, and some researchers have conducted impact testing on FRP RC beams [6,7]. Luo et al [8] studied the failure mechanism of reinforced and unreinforced concrete beams subjected to impact loading and the stress-pressure curve of externally mounted Carbon Fiber Reinforced Polymer (CFRP) plates in experimental research. In a few studies, the application of CFRP on ruptured-RC beams was investigated, and it was observed that CFRP improved the load bearing capacity of the beams by around 95% [9].…”

Ultimate Shear Force of an Any Anchor Group Post-Installed into Concrete

“…The strength of the vast majority of the tested specimens reported in the literature was dictated by premature failure modes [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 ]. In fact, the mechanisms that occurred in most of the experimental tests were concrete pry-out failure, concrete splitting, concrete breakout, concrete edge failure, or anchor failure.…”

“…Moreover, the phenomena that have been investigated for cast-in and post-installed shear anchors are premature failure modes, i.e., concrete edge failure, concrete splitting, anchor failure, concrete breakout, concrete pry-out failure, cyclic load failure, collapse due to prying actions [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 ]. Conversely, strength dictated by the concrete that surrounds the anchors by a pure shear mechanism has not been investigated, although this failure mode is the one that provides the greatest strength, so it should be the aim of anchor design as long as the geometric conditions allow it.…”