Torsional behavior of T- shaped reinforced concrete beams with large web openings

Salama, Ahmed E.; Kassem, Magdy; Mahmoud, Ahmed A.

doi:10.1016/j.jobe.2018.02.004

Cited by 26 publications

(8 citation statements)

References 13 publications

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“…The stress-strain (σ-ε) relationship for compression concrete diagonal struts must be adopted taking into consideration the softening effect for concrete, as shown in Fig. (9). Belarbi and Hsu [22] proposed (σ-ε) relationship with softening factor for maximum stress in concrete, β σ , and Zhang and Hsu [23] proposed the softening strain corresponding to maximum stress, β ε .…”

Section: Rausch Has Divided the Space Truss Model Theory Into Truss Analogy And Variable Angle Truss Model (Vatm)mentioning

confidence: 99%

“…Abdo et al [8] investigated the behavior of beams tested under pure torsion with the variables being, the beam depth, the number of the openings, and the spacing between stirrups. Salama et al [9] carried out an experimental and theoretical investigation on torsional behavior of T-shaped RC beams with large web openings, the study ̓ s parameters were flange width, flange thickness, and opening height. Other researches [10][11][12][13][14][15] studied the strengthening of concrete beams with opening subjected to pure torsion using Fiber Reinforced Polymers.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Analytical Investigation of Reinforced Concrete Beams with Large Web Opening under Pure Torsion

Abdel-Kareem¹,

Salam²

2020

IJAEMS

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This research presents the experimental and analytical results for reinforced concrete (RC) beams with rectangular large web openings under pure torsion. Fifteen specimens were tested; one solid specimen without opening, six specimens without reinforcement around opening as if an opening is created in an existing beam; where the investigated parameters were opening width, opening height and opening eccentricity from the longitudinal beam axis, and eight specimens with reinforcement installed around the opening to reduce the effect of the opening on the torsional behavior; where the investigated parameters were the shapes and amounts of the reinforcement around the opening. The test results showed that installing stirrups and horizontal reinforcement bars in the chords above and below the openings efficiently increased the cracking and ultimate torque of the tested specimens; where using inclined stirrups by 45º to the longitudinal axis of the specimens increased the ultimate torque to be about 90% of that of the solid specimen. Installing closed stirrups around the opening had small effect on enhancing the torsional behavior of the tested specimen compared with using horizontal and vertical reinforcement bars. The analytical model based on Modified Variable Angle Truss Model (MVATM) used to obtain the torque-rotation curves for beams under pure torsion was modified to incorporate the beams with large web opening which have different arrangements of reinforcement around the opening. MATLAB program language was used to obtain the analytical torque-rotation curves for the specimens that have reinforcement around the opening which were in good agreement with the experimental results.

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Section: Rausch Has Divided the Space Truss Model Theory Into Truss Analogy And Variable Angle Truss Model (Vatm)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Investigation of Reinforced Concrete Beams with Large Web Opening under Pure Torsion

Abdel-Kareem¹,

Salam²

2020

IJAEMS

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“…Most studies have focused on the behavior of RC with openings under static loading, and few studies have assessed the behavior under cyclic load. [ 15 , 16 , 17 ]…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Reinforced Concrete Beam with Openings Strengthened Using FRP Sheets under Cyclic Load

et al. 2020

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In this study, the cyclic behavior of reinforced concrete (RC) beam with openings strengthened using carbon fiber-reinforced polymers (FRPs) was experimentally investigated. Seven rectangular RC beams were cast and strengthened through external bonding of carbon fiber-reinforced polymer (CFRP) sheets around the beam web opening with different orientations to evaluate the maximum resistance, secant stiffness, strength degradation, ductility, energy dissipation capacity and behavior of the specimens’ failure mode under cyclic load. One solid beam without an opening (i.e., control specimen) and six beams constructed with circular web openings typically located in the middle of the beam and adjacent to the supports were used in the experiments. Among the six specimens with opening configuration, two beams were unstrengthened, and the remaining four specimens were strengthened with two layers of FRP sheets with vertical and inclined scheme orientation. Numerical studies were performed on ABAQUS software, and finite element modelling analysis results were verified through experiments. Results demonstrated that the use of FRP sheets has a significant effect on the cyclic behavior of RC beams, thereby improving the maximum strength and ultimate displacement to approximately 66.67% and 77.14%, respectively. The validated finite element models serve as a numerical platform to apply beneficial parametric studies, where the effects of opening size and bond length are investigated.

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“…Mansur et al [2] investigated the torsional behavior of reinforced concrete beams with large rectangular opening. The behavior of T-shaped RC beam specimens with large rectangular openings subjected to pure torsion was studied by Salama et al [3]. Makhlouf [4] studied the torsional behavior of strengthened beams.…”

Section: Introductionmentioning

confidence: 99%

Repair of Rc Beams With Openings Subjected to Torsion Using Steel Plates

Shalaby¹,

Diaa²,

Abdalla³

2020

International Journal of Civil Engineering and Technology (Ijciet)

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This paper presents the results of an experimental investigation on the behavior of RC beams with openings repaired by steel plates and subjected to pure torsion. The experimental study includes testing of seven RC beams divided into three groups. The parameters considered in this study include the steel plates configuration, opening width and steel plate thickness. The experimental work consists of one solid specimen, four specimens with openings of 300 x 150 mm and two specimens with openings of 500 x 150 mm. The results of the tested beams include cracking and ultimate torques, angle of rotation, toughness, and mode of failure. A cost effectiveness study was performed to compare the different repair configurations used in this research. The experimental results showed that using full steel plates in repairing beams with opening significantly improved the ultimate torsional capacity of such beams.

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Torsional behavior of T- shaped reinforced concrete beams with large web openings

Cited by 26 publications

References 13 publications

Experimental and Analytical Investigation of Reinforced Concrete Beams with Large Web Opening under Pure Torsion

Experimental and Analytical Investigation of Reinforced Concrete Beams with Large Web Opening under Pure Torsion

Experimental Investigation of Reinforced Concrete Beam with Openings Strengthened Using FRP Sheets under Cyclic Load

Repair of Rc Beams With Openings Subjected to Torsion Using Steel Plates

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