Behaviour of T-shaped RC deep beams with openings under different loading conditions

Ghali, Mona K.; Said, Mohamed; Mustafa, T.S.; El-Sayed, Abdallah A.

doi:10.1016/j.istruc.2021.01.091

Cited by 11 publications

(3 citation statements)

References 13 publications

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“…and Hwang, Shyh-Jiann (17)suggested an analytical method to predict the shear strength of deep beams with web openings and different modes of failure, also Hamid Karimizade and Abolfazl Arabzadeh (18) presented an analytical model based on strut and tie method to predict ultimate load for simply supported deep beam with circular or rectangular openings. Other researchers cared with T-shaped sections (19,20) Ata El-Kareim et al (19) studied experimentally the behavior of flanged deep beams with web openings while Ghali MK et al (20) studied numerically the Behavior of T-shaped deep beams with openings using different loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of BFRP Sheets on Strengthening Deep Beams with Openings

Mamdouh,

A. Awad,

A. Osman

2023

Engineering Research Journal

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In this study, the Basalt fibers from basalt rocks are used to strengthen openings in deep beams where this fiber is an environmentally friendly material that doesn't produce any toxic reactions with air or water, and its surface is anti-explosion. Also, it doesn't produce chemical reactions that may damage the environment or human health, when it contacts other chemicals, it is safe for use in industry and has no pollution, and the effect of strengthening deep beams with openings vertically by using these basalt fiber sheets is studied. A practical program has been developed to study the behavior of deep beams strengthened with basalt fiber-reinforced polymer (BFRP) sheets. The practical program consists of 6 beams designed as American code, with various types of openings. The results of the tested sheets and results of beams such as deflection, cracking load, crack propagation, ultimate load, and failure character, are recorded. Also, nonlinear analysis and mathematical equations are used in this study. This research can achieve that the basalt fiber sheets could affect slightly on the behavior of the deep beam with openings in cracking loads, deflections, stiffness, energy capacities, and ultimate loads.

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Section: Introductionmentioning

confidence: 99%

Effect of BFRP Sheets on Strengthening Deep Beams with Openings

Mamdouh,

A. Awad,

A. Osman

2023

Engineering Research Journal

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“…The different shapes of openings were experimentally studied first by Prentzas [1] as shown in Fig. 1 after which the structural classification depending on un-strengthened openings position under different loading types and the proposed strengthening methods were studied by several researchers [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Numerical nonlinear analysis of RC beans with un-strengthened and CFRP-strengthened opening drilled under service loads within shear zones

Khalaf

Aboul-Nour

Khater

et al. 2022

Frattura Ed Integrità Strutturale

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Current research paper deals with reinforced concrete (R.C.) beams numerical modeling and suggested strengthening procedure if it is required to create an opening within their shear zones. Strengthening is assumed to be achieved during different service load application conditions. Reinforced Concrete beams with rectangular or circular opening in shear zone; as critical regions; sustain two concentrated system of loads are tested till failure before and after performing suggested opening assessing technique by means of Carbon Fibers Reinforced Polymer sheets (CFRP). The main aim of this research is simulating real practice situation where the beam is subjected to service loads, supported temporary by means of hydraulic jacks, opening is created and strengthening is performed then jacking supports are released. Results of achieved numerical nonlinear modeling are introduced and influence of strengthening achieving on improving assessed beams almost structural behavior such as initial cracking loads, load deflection curves, cracking patterns, failure loads & modes for reference (without opening), main un-strengthened control beams, and CFRP strengthened opening beams are introduced and analyzed in details. Some important conclusions & recommendations for designer and executive engineers are stated.

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“…In RC structures, deep beams are used as loadbearing beams and coupling shear walls of tall buildings. Openings must be designed in deep RC beams for electrical and computer network cables, mechanical installations, or commuting from room to room [11][12][13][14]. These openings interrupt the transfer of compressive forces from the place of application of the load to the abutment and cause it to collapse, and many cases requiring retrofitting [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Experimental Comparison of Different Types of FRP Wrapping in Repairing of RC Deep Beams with Circular Openings

Rahimi

Jalali

Mirhoseini³

et al. 2021

IJE

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Openings of reinforced concrete (RC) deep beams can be used to pass electrical, mechanical, and architectural equipment. A comparative experimental study of fiber reinforced polymer (FRP) type on the performance of deep RC beams with the circular opening was the most important purpose of this study. The variables were FRP type (carbon, glass, and aramid) and the number of layers (1, 2, and 3). The geometric and rebar characteristics of the beams were considered constant in all cases. Deep RC beams were constructed, and their response to four-point loading was evaluated. Depending on the layers (1, 2 and, 3), aramid, carbon and glass fiber reinforced polymers (AFRP, CFRP, and GFRP) sheets increased the maximum load by about 65 to 94%, 87 to 130%, and 133 to 196%, respectively. In RC deep beams retrofitted with GFRP sheets, the sheet separation from the beam surface decreased with expanding the number of layers. The CFRP sheets debonded from the beam surface at the supports along the center of the circular opening. CFRP showed much better performance in energy absorption capacity and load capacity than AFRP and GFRP. The CFRP were debonded from the beam surface at the moment of rupture. However, no significant separation was observed in RC deep beams retrofitted with AFRP and GFRP sheets. SEM images of the cores specimens showed that the fracture surface of the specimens extracted from the beam retrofitted with GFRP and CFRP sheets was much rougher than the control specimen, which indicates a stronger bond between the concrete components.

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Behaviour of T-shaped RC deep beams with openings under different loading conditions

Cited by 11 publications

References 13 publications

Effect of BFRP Sheets on Strengthening Deep Beams with Openings

Effect of BFRP Sheets on Strengthening Deep Beams with Openings

Numerical nonlinear analysis of RC beans with un-strengthened and CFRP-strengthened opening drilled under service loads within shear zones

Experimental Comparison of Different Types of FRP Wrapping in Repairing of RC Deep Beams with Circular Openings

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