Experimental and theoretical study on flexural behavior of steel–concrete composite beams strengthened by CFRP plates with unbonded retrofit systems

Qiang, Xuhong; Chen, Longlong; Xu, Jiang

doi:10.1016/j.compstruct.2023.116763

Cited by 19 publications

(9 citation statements)

References 33 publications

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“…Reinforcing with 2 cm thick RPC2 is also approximately equal to covering three layers of CFRP, showing that RPC-reinforced concrete can also obtain good reinforcement effect, as shown in Figure 5. When the CFRP-reinforced compression test specimen fails, it will produce brittle failure without warning, and with the increase of the number of reinforcement layers, the brittle failure of the test specimen is more obvious [11][12][13][14]. Therefore, this phenomenon should be avoided in the structural reinforcement design.…”

Section: Concrete Beams Reinforced With Rpcmentioning

confidence: 99%

“…In recent decades, CFRP has been widely used in structural reinforcement, mainly because of its light weight, relatively ease of installation, high tensile strength, superior chemical properties, corrosion resistance, and fatigue performance, making it an attractive material in engineering structures [11][12][13][14]. In addition, RPC has also shown superior performance in structural reinforcement in recent years [15].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the reinforced concrete reinforcement method is commonly used to enlarge the column section to increase the bearing capacity, but the quality control of ordinary concrete reinforcement is not easy, and the large internal pores are prone to dry shrinkage and deformation, which reduces the effect of reinforcement and increases the column fracture. In addition, enlarging the section of the column will cause an unsightly appearance and inconvenience in space use [12,13]. Although there are many cases of CFRP and RPC in structural repair and reinforcement, there are not many related theoretical and experimental discussions.…”

Section: Introductionmentioning

confidence: 99%

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Flexure Strengthening and Analysis Using CFRP Composite and Reactive Powder Concrete

et al. 2023

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There are many cases of carbon fiber-reinforced polymer (CFRP) and reactive powder concrete (RPC) in structural repair and reinforcement, but there are not many related theoretical and experimental discussions. Therefore, the purpose of this research is to focus on the experiment and theoretical calculation of the flexural strengthening of concrete beam specimens. The study was primarily separated into two parts. In the first part, the laboratory tests of flexure strengthening by using CFRP and two reactive powder concretes (RPC1 and RPC2) are used to evaluate the effect of strengthening concrete beams. Secondly, the test value of the maximum flexure failure load of the strengthening specimen using RPC or CFRP and its theoretical value calculated by the transform section method or the ultimate strength method are discussed and compared with their reinforced effect. The test results show that the RPC and CFRP display excellent repair and retrofit potential. The RPC reinforcement material with a thickness of 2 cm and a steel fiber content of 1.0% is approximately equal to the reinforcement effect of three layers of CFRP. In particular, the RPC reinforcement effect is good, and the bonding interface is not damaged. The transform section method could be used to analyze and calculate the maximum flexure failure load of the RPC strengthening concrete beam. The transform section method and ultimate strength method cannot accurately analyze the maximum flexure failure load of the CFRP-strengthening concrete beam.

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Section: Concrete Beams Reinforced With Rpcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flexure Strengthening and Analysis Using CFRP Composite and Reactive Powder Concrete

et al. 2023

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“…Composite floor slabs, integral to PC residential flooring systems, combine a precast base plate with cast-in-place concrete, yielding robust structural integrity [2,3]. The design of these slabs necessitates reinforced connections to facilitate the coordinated load-bearing capacity of both post-cast and precast sections, with poorly executed designs potentially leading to structural vulnerabilities [4][5][6]. Owing to the dimensional limitations of precast slabs, assembling several pieces is often necessary for floor construction.…”

Section: Introductionmentioning

confidence: 99%

Study on the Tensile and Shear Performances of Fully Precast Partially Composite Floor Slab Joints

Zhang,

Chang,

Yang

et al. 2024

Buildings

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This study explored the tensile and shear characteristics of fully prefabricated partially composite floor slab joints through the design and testing of two tensile specimens, three steel–concrete specimens, and three concrete–concrete shear specimens. These tests aimed to evaluate how various connection designs influence the joints’ load-bearing capabilities and failure patterns. The findings revealed that the tensile specimens predominantly showed bond failures at the interface of the precast and cast-in-place layers, accompanied by rebar pull-out. Incorporating reinforcing bars or sleeves was found to potentially increase their ultimate load-bearing capacity by about 20%. The shear failures in the steel–concrete specimens were primarily due to interactions between the steel beam and adjacent composite slab, whereas the concrete–concrete specimens mostly underwent local crushing at the load application point and failure at the bonding interface. These observations affirmed the accuracy of the existing methods for calculating tensile and shear strengths, offering vital insights for the architectural design and construction of such floor joints.

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“…As one of the three major high-performance fibers in the world, aramid fiber possesses superior properties, such as low density, high tensile strength, high modulus, excellent thermal stability, abrasion resistance, chemical corrosion resistance, and outstanding ballistic performance [4][5][6][7]. Consequently, it is widely used in the manufacturing of advanced composite materials for aerospace, civil engineering, armored protection, and other fields [8][9][10][11][12][13]. However, in practical applications, due to the rigid molecular structure, high crystallinity, smooth surface, and low-molecular-surface active functional groups of aramid fiber, it exhibits certain drawbacks, such as surface chemical inertness [14,15].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Aramid Fiber Fabrics and Composites Enhanced by Phthalic Anhydride Catalyzed with Anhydrous Aluminum Chloride

Xiao,

Gao

et al. 2024

Applied Sciences

Self Cite

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The surface modification of aramid fiber plain fabric (PPTA) was conducted through phthalic anhydride treatment and anhydrous aluminum chloride (AlCl3) catalysis, aiming to enhance the interfacial bonding strength between aramid fiber fabric and bisphenol A diglycidyl ether (DGEBA) resin. The surface morphologies and structures of PPTA fiber before and after modification were characterized using scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and X-ray diffractometry. The mechanical properties of the PPTA/DGEBA composite were evaluated using a universal mechanical testing machine. The results demonstrate that when the concentration of phthalic anhydride is 0.3 mol/L, the tensile strength, bending strength and interlaminar shear strength of PPTA/DGEBA composites reach the maximum value, which are increased by 17.94%, 44.18%, and 15.94% compared with the unmodified sample, respectively. After a 0.5-h catalytic modification, the PPTA/DGEBA composites exhibited significantly enhanced tensile strength, bending strength, and interlaminar shear strength, achieving respective increments of 32.28%, 24.91%, and 29.10% compared to the modified samples without catalyst addition. Moreover, the overall mechanical properties of the aramid fiber fabrics and composites were substantially improved, which are more suitable for structural applications.

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Experimental and theoretical study on flexural behavior of steel–concrete composite beams strengthened by CFRP plates with unbonded retrofit systems

Cited by 19 publications

References 33 publications

Flexure Strengthening and Analysis Using CFRP Composite and Reactive Powder Concrete

Flexure Strengthening and Analysis Using CFRP Composite and Reactive Powder Concrete

Study on the Tensile and Shear Performances of Fully Precast Partially Composite Floor Slab Joints

Mechanical Properties of Aramid Fiber Fabrics and Composites Enhanced by Phthalic Anhydride Catalyzed with Anhydrous Aluminum Chloride

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