Flexural behavior of RC beams with regular square or circular web openings

Aykaç, Bengi; Kalkan, İlker; Aykaç, Sabahattin; Egriboz, Yusuf Emre

doi:10.1016/j.engstruct.2013.08.043

Cited by 86 publications

(42 citation statements)

References 7 publications

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“…The results from proposed approach are in a good agreement with the experimental values and finite element analysis (Campione and Minafò 2012). Aykac et al (2013) tested nine RC beams with a 150 9 400 mm rectangular section and with a span length of 3900 mm to investigate the influence of multiple web openings along the length on strength parameters. Test parameters considered in their study are, the flexural reinforcement, the opening geometry, and the arrangement and material properties of the diagonal reinforcement around the openings.…”

Section: Previous Studies On Rc Beams With Openingssupporting

confidence: 68%

A state of the art review on reinforced concrete beams with openings retrofitted with FRP

Osman

et al. 2016

Int J Adv Struct Eng

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The use of externally bonded fiber reinforced polymer (FRP) sheets, strips or steel plates is a modern and convenient way for strengthening of reinforced concrete (RC) beams. Several researches have been carried out on reinforced concrete beams with web openings that strengthened using fiber reinforced polymer composite. Majority of researches focused on shear strengthening compared with flexural strengthening, while others studied the effect of openings on shear and flexural separately with various loading. This paper investigates the impact of more than sixty articles on opening reinforced concrete beams with and without strengthening by fiber reinforcement polymers FRP. Moreover, important practical issues, which are contributed in shear strengthening of beams with different strengthening techniques, such as steel plate and FRP laminate, and detailed with various design approaches are discussed. Furthermore, a simple technique of applying fiber reinforced polymer contributed with steel plate for strengthening the RC beams with openings under different load application is concluded. Directions for future research based on the existing gaps of the present works are presented.

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Section: Previous Studies On Rc Beams With Openingssupporting

confidence: 68%

A state of the art review on reinforced concrete beams with openings retrofitted with FRP

Osman

et al. 2016

Int J Adv Struct Eng

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“…The results of these investigations have demonstrated the effectiveness of different opening geometries and different FRP systems such as sheet, wrap and strips to attain the desired effects. It should be noted that most studies presented in literature focus on the shear behavior and strength of RC shallow beams with openings (Mansur 2006;Osman et al 2016;Torunbalci 2002;Aykac et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Repair of Pre-cracked Reinforced Concrete (RC) Beams with Openings Strengthened Using FRP Sheets Under Sustained Load

Osman

et al. 2017

Int J Concr Struct Mater

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Strengthening reinforced concrete (RC) beams with openings by using aramid fiber reinforcement polymers (AFRP) on the beams' surfaces offers a useful solution for upgrading concrete structures to carry heavy loads. This paper presents a repairing technique of the AFRP sheets that effectively strengthens RC beams, controls both the failure modes and the stress distribution around the beam chords and enhances the serviceability (deflection produced under working loads be sufficiently small and cracking be controlled) of pre-cracked RC beams with openings. To investigate the possible damage that was caused by the service load and to simulate the structure behavior in the site, a comprehensive experimental study was performed. Two unstrengthened control beams, four beams that were pre-cracked before the application of the AFRP sheets and one beam that was strengthened without pre-cracking were tested. Cracking was first induced, followed by repair using various orientations of AFRP sheets, and then the beams were tested to failure. This load was kept constant during the strengthening process. The results show that both the preexisting damage level and the FRP orientation have a significant effect on strengthening effectiveness and failure mode. All of the strengthened specimens exhibited higher capacities with capacity enhancements ranging from 21.8 to 66.4%, and the crack width reduced by 25.6-82.7% at failure load compared to the control beam. Finally, the authors present a comparison between the experimental results and the predictions using the ACI 440.2R-08 guidelines.

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“…The energy absorption capacity of the beam with circular openings significantly more than energy absorption capacity of the beam with square openings. Also, failure of beam due to Vierendeel truss action reduce the ductility and energy absorption capacity [16].…”

Section: Introductionmentioning

confidence: 99%

Energy Absorption Capacity Of Layered Lightweight Reinforced Concrete Beams With Openings In Web

Jomaa’h

Ghaidan

2019

Civ Eng J

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This research presents the flexural behavior on reinforced concrete beam with transverse web opening constructed from layered concrete. The layered concrete combining normal concrete and lightweight aggregate concrete (LWC) are depended in present study. In the experimental program, 13 models of normal and layered reinforced concrete beams are tested under the effect of four-point loads. All beams had the same overall geometrical dimensions and main longitudinal top and bottom with internal diagonal reinforcement provided around the openings. One of the beam specimen is tested as control beam and the other specimens are divided into three groups [G1, G2, and G3] to study the effects of the following variables: effect of presence of web openings, layered system, lightweight aggregate (partially volumetric replacement of normal aggregate by thermostone) on the ultimate load, cracking load, cracking pattern and energy absorption capacity. The existing of an opening in beam specimens reduced the flexural capacity of beams with a percentage depending on the size of opening and opening number. The test data obtained from the adopted layered technique of (NEW) and (LWC) have shown that for beams constructed from two layered concrete (LWC with thermostone in the web and bottom flange of I-beam section) ultimate load is decreased about (9.3%-48.8%). It has also, the beams constructed from three-layered of concrete (LWC with thermostone in the web of I-beam section), their ultimate load is decreased about (25.6%-58.1%). On the other hand, magnitude increased of energy absorption capacity are achieved by the decreased opening size, introducing the full size opening of dimension (100×1000) mm reduces the energy absorption capacity of the RC I-section beams at least 80% compared to solid beam while the beam with opening size (100×100) mm decrease up to 16%. In the case of the layered concrete beams specimen, the real influence of lightweight concrete (LWC) type in the layered reinforced concrete is observed significantly after increasing the length of opening more than 100 mm.

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Flexural behavior of RC beams with regular square or circular web openings

Cited by 86 publications

References 7 publications

A state of the art review on reinforced concrete beams with openings retrofitted with FRP

A state of the art review on reinforced concrete beams with openings retrofitted with FRP

Repair of Pre-cracked Reinforced Concrete (RC) Beams with Openings Strengthened Using FRP Sheets Under Sustained Load

Energy Absorption Capacity Of Layered Lightweight Reinforced Concrete Beams With Openings In Web

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