Shear behavior of Reinforced Concrete (RC) beams with circular web openings without additional shear reinforcement

Osman, Bashir H.; Wu, Erjun; Ji, Bohai; Abdulhameed, Suhaib S.

doi:10.1007/s12205-016-0387-7

Cited by 25 publications

(12 citation statements)

References 10 publications

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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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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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“…The compression test is carried out according to ASTM C39 [4] on cylinders of 150X300 mm .Results of the tests for all concrete mix in this study at 28 days are higher than (17) MPa. This is the minimum required strength recommended by ACI Committee-213 [2] for structural LWC, as shown in Table 4.…”

Section: Concrete Compressive Strength (Fc')mentioning

confidence: 96%

“…Based on the shear span-to-depth ratio the beams were divided into three series. Test data showed that the openings in a high shear area (the line connecting the load and support points) led to the early collapse of the beams [17].…”

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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“…They concluded that the reduction in beam's capacity ranged from 6 to 8 % depending on the opening dimensions, the depth of the opening should not exceed 20 % of the beam overall depth (0.2d) and the reinforcement distribution should be in the range of 0.1-0.2H for simply supported deep beams. State of the art work on the behavior, analysis and design of RC beams with transverse web openings presented to discuss the structural behavior, classification of openings and guidelines for opening location of RC beams with web openings by various design approaches such as the American Concrete Institute (ACI) approaches, the Architectural Institute of Japan (AIJ) approach and the strut and tie method (Ahmed et al 2012;Osman et al 2016). Finite element investigation of steel beams with large web openings of various shapes and sizes was carried out to study the failure modes, moment-shear interaction and yield patterns (Chung et al 2003;Liu and Chung 2003).…”

Section: Analytical Studies On Performance Rc Beams With Openingsmentioning

confidence: 99%

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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Shear behavior of Reinforced Concrete (RC) beams with circular web openings without additional shear reinforcement

Cited by 25 publications

References 10 publications

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

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

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

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