Flexural Behavior of RC Members Using Externally Bonded Aluminum-Glass Fiber Composite Beams

Hong, Ki-Nam; Cho, Chang‐Geun; Lee, Swoo-Heon; Park, Yeonho

doi:10.3390/polym6030667

Cited by 8 publications

(4 citation statements)

References 27 publications

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“…γ 3 is the ratio between yield strength to the ultimate tensile strength of the reinforcement, which may have different values corresponding to the commonly used reinforcements in RC elements [1], as shown in Table 2. S c is the section modulus for the edge fibre of the section where the tensile stress of the section is caused by external loads [34,35], which is shown in Equation ( 13) for a rectangular section. f r is the rupture modulus of concrete, which may be expressed in Equation ( 14) in ksi units for normal weight concrete [1].…”

Section: Strength Limit Statementioning

confidence: 99%

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Unified Flexural Resistance Design Method and Evaluation Frame for the B-Regions of RC Flexural Members—Theory and Application

et al. 2023

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The load and resistance factor design (LRFD) method is normally used to design B-regions of reinforced concrete (RC) flexural members. The design includes many checks corresponding to different limit states. The LRFD method requires many loop calculation steps in the design, demonstrating its relative inefficiency. It cannot be applied to compare limit states directly and quantitatively. Different design limit states are separated and isolated. How to improve the analytical calculation efficiency of the LRFD method and to realize direct and quantitative comparisons between limit states are very important problems in structural engineering. This paper presents an innovative unified flexural resistance design (UFRD) method and a unified flexural resistance evaluation (UFRE) frame to solve these problems to some extent. The main contents include the unified flexural resistance (UFR) principles, formulas for the unified flexural resistance design (UFRD) method, the operation procedure to facilitate its usage, the UFRE framework to compare limit states, and three examples. The results show that the UFRD method can provide the same design outcomes as the LRFD one. However, UFRD calculations are simpler, requiring at most 20% of the calculation steps of the LRFD method. The UFRE frame can make different limit states compare with each other directly and quantitatively, which cannot be realized by the LRFD method. It helps expose some potential and insufficient flexural resistance hazards for some limit states, such as the only 10% relative strength reservation of one example. Thus, the UFRD method and the UFRE frame supplement and develop the LRFD method to some degree. The simplicity and practicality of the approach and the frame make them appropriate for many applications.

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Section: Strength Limit Statementioning

confidence: 99%

“…Based on elastic principles and the features of the gross concrete section, the tensile stress f b in the bottom fibres caused by M uf for a rectangular RC section can be calculated using Equation (35):…”

Section: Fatigue Limit Statementioning

confidence: 99%

Unified Flexural Resistance Design Method and Evaluation Frame for the B-Regions of RC Flexural Members—Theory and Application

et al. 2023

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“…FRP telah diterapkan pada beberapa struktur sebagai perkuatan untuk beton pada struktur baru atau struktur yang telah lama (Hamid & Hutchinson, 2001). Penggunaan FRP sebagai perkuatan eksternal pada balok beton bertulang meningkatkan beban retak awal, beban leleh, dan puncak (Hong et al, 2014). Perkuatan balok beton bertulang dengan pemasangan GFRP tipe lembaran pada bagian bawah balok dapat meningkatkan kapasitas lentur balok dibandingkan dengan balok kontrol atau tanpa perkuatan (Meikandaan & Murthy, 2017).…”

Section: Pendahuluanunclassified

Model Hubungan Kapasitas Rekatan Balok Beton Bertulang yang Diperkuat GFRP-S terhadap Lama Perendaman Air Laut

Sultan

Djamluddin

2019

MKTS

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The construction of structures with reinforced concrete materials in coastal environments will face constraints in the form of chloride influences which can lead to a decrease in strength and even damage. One of the most popular reinforcement methods today is using a corrosion resistant Glass Fiber Reinforced Polymer (GFRP) material. This study was conducted to investigate the behavior of GFRP-S rectifying capacity in reinforced concrete beam reinforcement in 1, 3, 6, and 12 months. The test specimens consist of 10 reinforced beams with dimensions (15x20x330) cm that has been reinforced with GFRP-S in the bending area. Beams without immersion symbolized B0, immersion 1, 3, 6, and 12 months each given symbols B1, B3, B6 and B12. The test specimen is loaded statically until it fails. To record the data when testing is installed strain gauge and LVDT. From the result of the research, it can be seen that there is a decrease of GFRP-S rectification capacity in the test specimen after soaking in seawater. The value of the decrease in the capacity of the bonding can be predicted by using the equation = 0 −0.0072 AbstrakPembangunan struktur dengan material beton bertulang pada daerah lingkungan pantai akan menghadapi kendala berupa pengaruh klorida yang dapat mengakibatkan penurunan kekuatan bahkan kerusakan. Salah satu cara perkuatan yang populer saat ini dengan menggunakan material Glass Fiber Reinforced Polymer (GFRP) yang tahan korosi. Penelitian ini dilakukan untuk menyelidiki perilaku kapasitas rekatan GFRP-S pada perkuatan balok beton bertulang yang direndam dalam air laut selama 1, 3, 6, dan 12 bulan. Benda uji terdiri dari 10 buah balok bertulang dengan dimensi (15x20x330) cm yang telah diperkuat dengan GFRP-S pada daerah lentur. Balok tanpa perendaman disimbolkan B0, perendaman 1, 3, 6 dan 12 bulan masing-masing diberi symbol B1, B3, B6 dan B12. Benda uji diberi beban statik sampai gagal. Untuk merekam data-data pada saat pengujian dipasang strain gauge dan LVDT. Dari hasil penelitian terlihat bahwa terjadi penurunan kapasitas rekatan GFRP-S pada benda uji setelah direndam dalam air laut. Nilai penurunan kapasitas rekatan dapat diprediksi dengan menggunakan persamaan = 0 −0,0072 .Kata kunci: GFRP-S, kapasitas rekatan, air laut

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“…According to the review by Panigrahi et al (2014), this method was using for the strengthening and repair of structures due to actions of ageing, poor maintenance, corrosion of steel reinforcement, defects in construction, exposure to harmful environments and damage in case of seismic events, and the deficiency of the initial design such as demand in the serviceability state, the durability and ductility of reinforced concrete structures. Most studies indicated that the use of the EB technique would enhance the load carrying, shearing and flexural capacities of RC members (Dai et al 2005, Panigrahi et al 2014, Ali et al 2014, Hong et al 2014. At the present, the study of the EB strengthening method for the RC members is extending to consider the various and combined effects of elevated temperature and environment conditions, the interfacial behavior and the new approach of numerical analysis (Dai 2005, Burke et al 2013, Domenico et al 2015, and Firmo et al 2015.…”

Section: Assessments Of the Current Strengthening Methodsmentioning

confidence: 99%

Mechanical performances of concrete beams with hybrid usage of steel and frp reinforcement

Bui

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Fiber-reinforced polymer (FRP) bars have been recently employed to reinforce concrete members due to their high tensile strength and especially in corrosive environments to improve the durability of concrete structures. However, FRP composites have a low modulus of elasticity and a linear elastic behavior up to rupture, thus reinforced concrete (RC) components with such materials would express a lack of ductility. In order to increase the mechanical performances of RC beams, the hybrid usage (also called combined usage) of FRP and steel reinforcements in shear and flexure is proposed. At first, an experimental investigation of concrete beams strengthened in shear by FRP bars using embedded through-section (ETS) technique is carried out to study the efficiency of the strengthening system under various effects. The prediction of shear contribution of the retrofitting system is also proposed. Additionally, the pullout tests are conducted to investigate the bond response between ETS bars and concrete under various influences. Furthermore, the finite element (FE) simulation of the tested beams to validate the effectiveness of the FE tool is offered. Comparison between the results attained from this study and the literature displays the significant improvement in the shear efficiency of the ETS strengthening system with the anchorage installation. Furthermore, for the concrete beams strengthened in shear using ETS method, the truss analogy theory with the developed average strain formulation is an effective method to predict the shear resisting force of the anchored ETS FRP bars. In the second part of research, this study presents a numerical and analytical study on the structural behaviors of concrete beams with the combined usage of FRP and steel tension reinforcement employing three-dimensional (3D) FE modelling. The ductility of the hybrid FRP-steel RC beams under important effects is closely analyzed through parametric study. Based on the investigated results, the conditions of the ratio of FRP to steel reinforcement, the location of the FRP reinforcement and the type of FRP reinforcement required to obtain reasonable ductility in practical use are presented.

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Flexural Behavior of RC Members Using Externally Bonded Aluminum-Glass Fiber Composite Beams

Cited by 8 publications

References 27 publications

Unified Flexural Resistance Design Method and Evaluation Frame for the B-Regions of RC Flexural Members—Theory and Application

Unified Flexural Resistance Design Method and Evaluation Frame for the B-Regions of RC Flexural Members—Theory and Application

Model Hubungan Kapasitas Rekatan Balok Beton Bertulang yang Diperkuat GFRP-S terhadap Lama Perendaman Air Laut

Mechanical performances of concrete beams with hybrid usage of steel and frp reinforcement

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