Behavior of CFRP-strengthened RC beams with circular web openings in shear zones: Numerical study

Özkılıç, Yasin Onuralp; Aksoylu, Ceyhun; Yazman, Şakir; Gemi, Lokman; Arslan, Musa Hakan

doi:10.1016/j.istruc.2022.05.061

Cited by 49 publications

(22 citation statements)

References 58 publications

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“…Because of their outstanding mechanical, thermal, and electrical qualities, polymer-based composite materials have become increasingly popular in engineering applications such as aircraft, naval, and automobiles in recent decades. [1][2][3][4] Today's modern technological structures commonly use fiber reinforced composites. Fiber reinforced composite laminates, in particular, are widely employed in thin-walled form in key aircraft components such as the fuselage, wing, tail, and propeller.…”

Section: Introductionmentioning

confidence: 99%

Assessment of nanoclay impact on buckling response of carbon/Kevlar hybrid composites

et al. 2023

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This study investigates the effects of nanoclay (NC) particles on the buckling behavior of carbon/Kevlar intraply hybrid composites. The laminates containing various amounts of NC particles (0.5%, 1%, 1.5%, 2%, and 3% by weight) were manufactured using hand layup stacking followed by vacuum bag molding process. The prepared samples were subjected to axial and lateral compressive loads under fixed-fixed and fixed-free boundary conditions, respectively, and the relevant critical buckling loads were determined. Furthermore, the failure modes were examined via microscopic views taken from the damaged areas on the samples to fully understand the influences of NC particles on buckling characteristics. The findings demonstrated that the buckling behaviors of the samples were significantly affected by the introduction of NC particles. Compared with the composite samples without any NC particles, the composite samples with 1 wt% NC particles showed an increase of 21.12% and 25.33% in the axial and lateral critical buckling loads, respectively. However, the inclusion of NC particles with an amount that higher than 1 wt% showed a decreasing trend in terms of critical loads for both buckling loadings, which can be viewed as a measure of load-bearing capability. Moreover, the samples filled with 3 wt% NC particles exhibited a decrement on critical loads compared with those of samples without any NC particle filler. With the help of microscopic views, the failure modes were detected as matrix fragmentation and delamination for both buckling loadings.

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Section: Introductionmentioning

confidence: 99%

Assessment of nanoclay impact on buckling response of carbon/Kevlar hybrid composites

et al. 2023

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“…It was seen that flexural and splitting tensile strengths of the experimental mix containing 75% bottom ash and 20% fly ash exceeded much more than the control sample. As can be seen from the previous studies, there are many studies on concrete performance using waste materials (Ghafoori and Bucholc, 1996;Topçu and Bilir, 2010a;Bilir, 2012;Singh and Siddique, 2013;Bilir, 2016;Lee et al, 2019;Karalar et al, 2022;Çelik et al, 2022;Qaidi et al, 2022;Aksoylu et al, 2022a) and other materials such as composite (Alam and Hussein, 2017;Truonga et al, 2017;Araba and Ashour, 2018;Bicer et al, 2018;Deng et al, 2018;Mahmood et al, 2018;Xu et al, 2018;Marvila et al, 2019;Azevedo et al, 2020;Wang et al, 2020;Azevedo et al, 2021;Özkılıç et al, 2021;Akın et al, 2022;Al-Rousan and Al-Muhiedat, 2022;Aksoylu et al, 2022b;Gemi et al, 2022;Huang et al, 2022;Lu et al, 2022;Tran et al, 2022;Özkılıç et al, 2022) in the literature. Researchers have identified differences in the properties of concrete, but few have discussed how the trade-offs of using a fine natural aggregate in place of a typical Portland cement (PC) mix.…”

Section: Introductionmentioning

confidence: 99%

Use of recycled coal bottom ash in reinforced concrete beams as replacement for aggregate

et al. 2022

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In this research, it is studied the crack and flexural behavior of reinforced concrete beams with various bottom ash ratios (BARs) considered as fine aggregate in an experimental and numerical investigation. For experimental purposes, different concrete series are considered varying aggregate sizes ranging from 0 to 25 mm. To supplement concrete, bottom ash is put to use in conjunction with material from 0–5 mm in size aggregate particles as replacement for fine aggregates with ratios of 25%, 50%, 75%, and 100%. Experiments were done to investigate the behavior of the beams and how flexural and fracture behaviors are represented. 75% BARs gave optimum results in terms of displacement capacity. Increasing BAR to 100% decrease deflection capacity of the beam. Also, ANSYS software is used to build 3D finite element models (FEMs) of beams to compare with experiment data. Experimental and 3D numerical tests show exceptionally tight flexural and fracture behaviors. Following this, a computer-generated structure is made by running SAP 2000, and the strength of the beams is then utilised in an RC structural model. Every stage of the building’s construction is thoroughly assessed utilizing multiple types of seismic testing, employing the SAP2000 program, with the resulting analysis providing significant findings on how the seismic force of 75% BAR affects horizontal displacement of each floor. The results showed that the weight of the structure dramatically decreases as the number of columns and RCBs are raised while also increasing the number of BARs. Moreover, the magnitude of earthquake and BAR have a significant effect on the horizontal displacement behavior of reinforced concrete structures. The strength of the concrete structure varies between close- and far-fault earthquakes, and for close-fault earthquakes, concrete strength is stronger than for far-fault earthquakes. This brings us to the second disadvantage of BAR which is the 75% strain produces a severe displacement of reinforced concrete structures. Besides, it was seen that the simulations and experiments yield tiny cracks with very identical configurations.

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“…Most existing studies on the behavior of reinforced concrete (RC) beams with a web opening have chosen to use FRP reinforcement (e.g., externally bonded FRP or near surface mounted FRP) for the strengthening of the opening region [ 27 , 28 ]. FRP has been found to be effective for strengthening RC members in structures because of its excellent mechanical properties [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ]. A number of studies have been conducted to investigate the behavior of RC beams with an FRP-strengthened web opening.…”

Section: Introductionmentioning

confidence: 99%

Compressive Behavior of Pultruded GFRP Boxes with Concentric Openings Strengthened by Different Composite Wrappings

et al. 2022

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Web openings often need to be created in structural elements for the passage of utility ducts and/or pipes. Such web openings reduce the cross-sectional area of the structural element in the affected region, leading to a decrease in its load-carrying capacity and stiffness. This paper experimentally studies the effect of web openings on the response of pultruded fiber-reinforced polymer (PFRP) composite profiles under compressive loads. A number of specimens have been processed to examine the behavior of PFRP profiles strengthened with one or more web openings. The effects of the size of the web opening and the FRP-strengthening scheme on the structural performance of PFRP profiles with FRP-strengthened web openings have been thoroughly analyzed and discussed. The decrease in load-carrying capacity of un-strengthened specimens varies between 7.9% and 66.4%, depending on the diameter of the web holes. It is observed that the diameter of the hole and the type of CFRP- or GFRP-strengthening method applied are very important parameters. All CFRP- and GFRP-strengthening alternatives were successful in the PFRP profiles, with diameter-to-width (D/W) ratios between 0.29 and 0.68. In addition, the load-carrying capacity after reinforcements made with CFRP and GFRP increased by 3.1–30.2% and 1.7–19.7%, respectively. Therefore, the pultruded profiles with openings are able to compensate for the reduction in load-carrying capacity due to holes, up to a D/W ratio of 0.32. The capacity significantly drops after a D/W ratio of 0.32. Moreover, the pultruded profile with CFRP wrapping is more likely to improve the load-carrying capacity compared to other wrappings. As a result, CFRP are recommended as preferred composite materials for strengthening alternatives.

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Behavior of CFRP-strengthened RC beams with circular web openings in shear zones: Numerical study

Cited by 49 publications

References 58 publications

Assessment of nanoclay impact on buckling response of carbon/Kevlar hybrid composites

Assessment of nanoclay impact on buckling response of carbon/Kevlar hybrid composites

Use of recycled coal bottom ash in reinforced concrete beams as replacement for aggregate

Compressive Behavior of Pultruded GFRP Boxes with Concentric Openings Strengthened by Different Composite Wrappings

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