Modification of strut effectiveness factor for reinforced concrete deep beams strengthened with CFRP laminates

Panjehpour, Mohammad; Ali, Aidy; Voo, Yen Lei; Aznieta, Farah Nora

doi:10.3989/mc.2014.02913

Cited by 14 publications

(7 citation statements)

References 31 publications

(35 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(2014) [4] They presented the effect of CFRP-strengthening on the deformation of RC strut in the design of deep beams .they reported that The value of transverse strain of ordinary RC struts remarkably grew faster than that of CFRP strengthened RC struts after the amount of loading was higher than approximately 40-60% of ultimate shear strength of ordinary RC deep beams. M. Panjehpoura et al . (2014) [5] They proposes strut-and-tie model for CFRP-strengthened reinforced concrete deep beams.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Strengthening and Repairing of Rc Deep Beams Using CFRP and GFRP

Zaher¹,

Montaser²,

Elsonbaty³

2020

International Journal of Civil Engineering and Technology (Ijciet)

View full text Add to dashboard Cite

There are many reasons to upgrade an existing structure such as building code changes, accidents, design errors or building use changes. Few years ago the construction industry began using fibre reinforced polymer (FRP) for structural reinforcement, typically in combination with other building materials such as wood, steel and concrete. FRP show multiple attractive properties, such as low weight to strength ratio, non-corrosiveness high fatigue strength, and case of application. This study investigated different techniques to improve the performance of RC deep beams under two concentrated vertical loads using advanced composite materials (CFRP and GFRP sheets). The primary aim of this research was to study the behaviour of deep beams strengthened and repaired in shear using carbon and glass fibres. Thirteen RC deep beam specimens were simply supported with span lengths L=1500 mm and cross sections 140 x 450 mm. The tested beams were subjected to the effects of two concentrated loads with spacing of 560, 360 and 160 mm and were divided into five groups. The test results show that the deep beams strengthened by CFRP sheets & GFRP sheets provided improvement in ultimate loads. The maximum increase in ultimate loads reached 106% & 81% respectively and the decrease in deflection for beams was attributed to the type, configurations and orientation of the FRP sheets. An analytical model was done based on code equations to predict the deformational behaviour of RC deep beams shear-strengthened with FRP composites , and obtain the failure loads by using three codes equations and compare the results with the experimental results ,The proposed analytical model gave good compliance with the experimental results .

show abstract

Section: Introductionmentioning

confidence: 99%

“…M. Panjehpoura et al . (2014) [5] They proposes strut-and-tie model for CFRP-strengthened reinforced concrete deep beams. They found that that CFRPeditor@iaeme.com strengthening increases the ultimate shear strength of deep beams from 19.60 % to 30.02 % with shear span-to-effective depth ratios of 0.75 to 2.00, respectively.…”

Section: Introductionmentioning

confidence: 99%

Strengthening and Repairing of Rc Deep Beams Using CFRP and GFRP

Zaher¹,

Montaser²,

Elsonbaty³

2020

International Journal of Civil Engineering and Technology (Ijciet)

View full text Add to dashboard Cite

show abstract

“…Substantial research was carried out on the application of polymers in concrete [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Batayeneh et al…”

Section: Introductionmentioning

confidence: 99%

Mechanical Propagates of Concrete with Partial Replacements of Sand by Plastic Waste of Vehicles under Impact Load

Al-Tayeb¹

2017

IJERMT

View full text Add to dashboard Cite

Abstract:lastic waste of vehicle causes serious health and environmental problems all over the world. As a possible solution to the problem of plastic waste of vehicle, an experimental study was conducted to examine the potential of using it as sand replacement in the concrete. This paper examines impact strength properties of concrete in which different amounts 2.5%, 5%, 10% and 20 % of plastic waste particles were used as sand replacement. For each amount, six cubes of 100 mm ×100 mm × 100mm were subjected to 4.5 kg hammer from 480mm height. The number of blows of the hammer required to induce the first visible crack of the cubes were recorded. The results are presented in terms of impact energy required for the first visible crack. The concrete mixtures exhibited ability to absorb a large amount of impact energy. The plastic waste of vehicle increased the first crack impact energy of concrete.Keywords: Plastic waste of vehicle; Cement concrete; Compressive strength; Impact energy. I. INTRODUCTIONThe plastic waste of vehicle is considered as one of the major environmental problems faced by every country due to their health hazards and difficulty for land filling [1]. The reuse of wastes is important from different points of view. It helps to save and sustain natural resources that are not replenished, it decreases the pollution of the environment and it also helps to save and recycle energy production processes. Concrete has been identified to be one of the feasible options. Although concrete is the most commonly used construction material, it has limited properties such as low tensile strength, ductility, toughness and impact resistance [2].Substantial research was carried out on the application of polymers in concrete [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Batayeneh et al.[3] showed the deterioration of compressive strength with an increase in the proportion plastic content. For the plastic proportion of 20% of sand, the compressive strength was reduced up to 70% compared to that of normal concrete. Recently, Marzouk et al. [4] studied the use of consumed plastic bottle waste as sand substitution aggregate within composite materials for building applications and showed the effects of polyethylene terephthalate (PET) waste on the density and compressive strength of concrete. It was found that the density and compressive strength decreased when the PET aggregates exceeded 5% by volume of sand.Rahmani et al. [5], observed that the 5% replacement of fine aggregates with PET particles yields better results in compression. However, with further increase in polyethylene terephthalate particles to 10% and 15% the compressive strength of concrete decreases due to weak cohesion between the texture and the PET particles. Araghi et al. [6] reported that the concrete containing plastic waste has better sulfuric acid attack resistance in industrial structures and sewer pipes. Raj et al. [7] investigated the strength and behavior plain and fiber reinforced polymer concrete beam column joints and the r...

show abstract

“…The dimensions estimation of bottle-shaped strut is essential in design calculations as the mechanical behaviour of strut is mainly influenced by its dimensions [ 2 , 7 , 19 ]. Among the latest publications on the STM and CFRP-strengthened RC deep beams [ 22 – 24 ] no research focused on the strut deformation subjected to load. Hence, determination of strut deformation under loading is vital for a reliable design.…”

Section: Introductionmentioning

confidence: 99%

Strut Deformation in CFRP-Strengthened Reinforced Concrete Deep Beams

Panjehpour

Chai

Voo³

2014

The Scientific World Journal

View full text Add to dashboard Cite

Strut-and-tie model (STM) method evolved as one of the most useful designs for shear critical structures and discontinuity regions (D-regions). It provides widespread applications in the design of deep beams as recommended by many codes. The estimation of bottle-shaped strut dimensions, as a main constituent of STM, is essential in design calculations. The application of carbon fibre reinforced polymer (CFRP) as lightweight material with high tensile strength for strengthening D-regions is currently on the increase. However, the CFRP-strengthening of deep beam complicates the dimensions estimation of bottle-shaped strut. Therefore, this research aimed to investigate the effect of CFRP-strengthening on the deformation of RC strut in the design of deep beams. Two groups of specimens comprising six unstrengthened and six CFRP-strengthened RC deep beams with the shear span to the effective depth ratios (a/d) of 0.75, 1.00, 1.25, 1.50, 1.75, and 2.00 were constructed in this research. These beams were tested under four-point bending configuration. The deformation of struts was experimentally evaluated using the values of strain along and perpendicular to the strut centreline. The evaluation was made by the comparisons between unstrengthened and CFRP-strengthened struts regarding the widening and shortening. The key variables were a/d ratio and applied load level.

show abstract

Modification of strut effectiveness factor for reinforced concrete deep beams strengthened with CFRP laminates

Cited by 14 publications

References 31 publications

Strengthening and Repairing of Rc Deep Beams Using CFRP and GFRP

Strengthening and Repairing of Rc Deep Beams Using CFRP and GFRP

Mechanical Propagates of Concrete with Partial Replacements of Sand by Plastic Waste of Vehicles under Impact Load

Strut Deformation in CFRP-Strengthened Reinforced Concrete Deep Beams

Contact Info

Product

Resources

About