Rehabilitation of RC flexural members in shear with externally bonded fiber-reinforced polymer composites: present status and future need

Kar, Swapnasarit; Biswal, K. C.

doi:10.1007/s43452-021-00274-8

Cited by 7 publications

(2 citation statements)

References 165 publications

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“…The strengthening of concrete structures is the field of construction where composite materials made of FRPs (fibrereinforced polymers) are being introduced most quickly and with the greatest success [1,2], mainly due to their corrosion resistance, good mechanical properties and lightness that translates into ease and savings in the execution of works. Typical FRP applications include flexural strengthening [3], shear strengthening [4] or strengthening of beam-column joints suffering from both flexural and shear deficiencies [5].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the compressive behaviour of FRP-confined rectangular concrete columns

Diego

Martı́nez

Castro

et al. 2022

Archiv.Civ.Mech.Eng

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This paper presents a comprehensive experimental study on the behaviour of FRP-confined concrete in square and rectangular columns and focuses on some issues that might be addressed with a view to improving the predictive models. For this purpose, 31 prismatic concrete specimens with a height of 600 mm and low- and medium-strength concrete (20–35 MPa) were tested under centred compression. The parameters studied were the aspect ratio between the sides of the section (1, 1.5 and 2), the radius of curvature of the corners (20, 25 and 30 mm) and the number of carbon FRP layers applied. The experimental results included stress–strain curves of specimens and detailed information about the confined concrete strength and the axial and lateral strain achieved on the FRP jacket during the tests. The stress–strain response and ultimate condition are analysed, showing that FRP jacketing is an efficient technique for increasing the strength and strain capacity, but that confinement efficiency decreases as the aspect ratio of the section increases. In spite of such decrease, significant strength improvement was achieved for low-strength concrete in rectangular sections with aspect ratios of 1.5 (strength gain up to 81%), and even 2 (up to 36%). The axial strength of the tests was compared with the design criteria of four international guidelines, resulting in predictions that did not properly fit for rectangular sections. A predictive equation is proposed to assess the axial compressive strength of the FRP-confined concrete, which includes a better adjustment for the strain efficiency factor and the shape factor for rectangular columns.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation on the compressive behaviour of FRP-confined rectangular concrete columns

Diego

Martı́nez

Castro

et al. 2022

Archiv.Civ.Mech.Eng

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“…Beberapa metode ini di antaranya a) metode konvensional dengan cara memperbesar dimensi balok atau menempelkan plat baja pada penampang balok (Faghihmaleki, 2021;Lie et al, 2021), dan b) metode baru dengan menggunakan material komposit fiber reinforced polymer (FRP) (Djamaluddin et al, 2015). Metode perkuatan dengan menggunakan material FRP ini dapat dilakukan dengan cara external bonded (EB) yaitu merekatkan lembaran FRP ke permukaan beton (Benzeguir Zine El et al, 2019;Chalioris et al, 2020;Jamal et al, 2016;Kar & Biswal, 2021;Oller et al, 2019;Sultan et al, 2022), dan atau near-surface mounted (NSM) yaitu memasang tulangan pada alur yang dibuat di permukaan selimut beton (Ibrahim et al, 2020;Nikoloutsopoulos et al, 2023;Panahi et al, 2021;Utomo et al, 2021;Zhang et al, 2017).…”

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Pengaruh Penambahan Tulangan Vertikal Pada Perkuatan Balok Beton Bertulang Dengan Menggunakan Metode Deep Embedment

Akbar,

Ridwan,

Ikhsan

2023

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Abstrak Kapasitas beban struktur beton bertulang eksisting seringkali tidak mencukupi untuk memenuhi standar saat ini. Hal ini dikarenakan peningkatan kebutuhan beban dan degradasi material beton serta korosi tulangan akibat kondisi lingkungan. Penelitian ini dilakukan untuk mendapatkan pengaruh penambahan tulangan vertikal pada perkuatan beton bertuang dengan menggunakan metode deep embedment (DE). Dalam penelitian ini dipersiapkan tiga buah benda uji balok beton bertulang, yaitu Balok-CS, Balok-D8, dan Balok-D12. Ketiga benda uji mempunyai ukuran penampang 150 mm x 200 mm dan panjang bentang 1400 mm. Ada dua ukuran tulangan yang digunakan sebagai tulangan perkuatan DE, yaitu tulangan diameter 8 mm dan 12 mm. Pengujian Balok-CS dibebani sampai runtuh, sementara Balok-D8 dan Balok-D12 dibebani 2 kali. Pembebanan pertama dilakukan sampai balok tersebut mengalami retak pertama dan pembebanan ke dua dilakukan sampai runtuh setelah balok tersebut diperkuat. Hasil penelitian menunjukkan bahwa perkuatan dengan metode DE yang dilakukan dalam penelitian ini dapat meningkatkan kapasitas beban ultimit sampai dengan 43% dibandingkan dengan benda uji kontrol. Sementara itu kekakuan pada balok yang diperkuat dengan metode DE juga meningkat. Hasil pengujian menunjukkan bahwa kekakuan balok yang diperkuat pada fase linear meningkat sampai dengan 70% sementara kekakuan balok pada kondisi ultimit meningkat sampai dengan 91% dibandingkan dengan kekakuan benda uji kontrol. Kata kunci: perkuatan, beton bertulang, metode DE, beban ultimit, kekakuan Abstract Current standards for load capacity are often not met by existing reinforced concrete (RC) structures due to increased loads and corrosion-related degradation of concrete and steel reinforcement bars. This study has developed a technique for repairing RC beams through the use of deep embedment (DE) bars. Three beams, each with a cross-section of 150 ´ 200 mm and a total length of 1400 mm, were constructed with plain bars of 8 and 12 mm diameter as DE bars. Two loading schemes were employed during testing: loading the beam up to failure and precracking to simulate the damage in RC structures. Results showed that the contribution of DE bars to the load capacity was significant. The load capacity of the strengthened beam was 43% higher than that of the control beam. The stiffness of the DE-reinforced beam also increased, with an up to 70% increase in the linear phase and an up to 91% increase in the ultimate condition. The use of embedded DE bars is an effective method for repairing and strengthening RC beams that do not meet load capacity standards. These findings have practical implications for the structural engineering industry, offering a viable solution for deteriorating RC structures. Keywords: strengthening, reinforced concrete, DE method, ultimate load, stiffness

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Investigation of the Compressive Behaviours of Waste-Containing FRP-Confined Concrete Columns

Dada,

Guobin,

Xia

et al. 2024

Lecture Notes in Civil Engineering

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Rehabilitation of RC flexural members in shear with externally bonded fiber-reinforced polymer composites: present status and future need

Cited by 7 publications

References 165 publications

Experimental investigation on the compressive behaviour of FRP-confined rectangular concrete columns

Experimental investigation on the compressive behaviour of FRP-confined rectangular concrete columns

Pengaruh Penambahan Tulangan Vertikal Pada Perkuatan Balok Beton Bertulang Dengan Menggunakan Metode Deep Embedment

Investigation of the Compressive Behaviours of Waste-Containing FRP-Confined Concrete Columns

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