Design of fibre reinforced concrete beams and slabs master of science thesis in the masters programme structural engineering and building performance design ammar abid, kenneth b. Investigation of flexural fatigue behavior of concrete. Recently, the use of steel fibers has been increased in flexural members and columns of concrete structures subjected to cyclic loadings, such as bridge decks, highway roads, airport runways, and buildings. To study the influence of steel fibers on the fatigue behavior of conventionally reinforced concrete structures, beams reinforced with three different volumes of reinforcing bars were tested in a.
Lot of research work had been done on steel fiber reinforced concrete for basically enhancing the flexure capacity of the concrete material. Fatigue behavior of steel fiber reinforced high strength concrete. Singh and kaushik studied the fatigue behaviour of concrete reinforced with 1. Tests concern beams with conventional as well as steel fibre reinforcement. The quasistatic compressive and split tensile tests were also conducted to obtain the static properties of plain concrete and steel fibre reinforced concrete frc materials. Fracture and fatigue tests were performed in order to investigate the fracture and fatigue behavior of steelfibrereinforced concrete sfrc structures. The effects of several variables such as concrete weight, concrete grades, shear span to depth ratio ad and the amount of stirrups were experimentally investigated. Flexural behavior of highstrength fiber reinforced. This paper reports investigation conducted to study the fatigue performance of steel fibre reinforced concrete sfrc containing fibres of mixed aspect ratio.
Nine fiber reinforced beams and one plain reinforced concrete beam were tested by twopoint loading. All beams are singly reinforced with three different bar types. The investigation also includes the study of steel fiber reinforced concrete deep beams with web reinforcement with and without openings. Bond behaviour of beams reinforced with near surface. This thesis is a summary of research on the use of glass fibre reinforced polymer gfrp bars and stirrups as internal reinforcement for concrete beams. Aug 17, 20 this paper deals with the effect of steel fiber reinforcement on the behavior of selfcompacting concrete scc beams. The behavior of steel fibers in enhancing the fatigue life of deep beams and reducing the congestion of reinforcement in concrete is studied, and the possibility of obtaining optimized structural sections that are costeffective using steel fiber reinforced concrete is verified. The behaviour of steel fibre reinforced concrete material and. Shear behaviour of fiber reinforced concrete beams 365 0 r 10 0 10 20 30 40 force kn fig. Flexural fatigue behaviour of recycled tyre polymer fibre. Flexural fatigue strength of steel fibrous concrete. For this, a drop weight test was performed on the 28 days cured plain and fibre reinforced concrete samples as per the testing procedure.
However, few experimental tests have been carried out under fatigue loading. Shear behaviour of steel fibre reinforced concrete beams. Flexural fatigue strength prediction of steel fibre reinforced concrete beams. The high correlation between fatigue life and twoparameter weilbull distribution for frc was also. This paper investigates the influence of cyclic preloading on the fatigue behavior of reinforced concrete rc beams rehabilitated with near surface mounted nsm carbon fiber reinforced polymer cfrp reinforcement. Flexural fracture and fatigue behaviour of steelfibre. The present work investigated experimentally the bond behaviour of nonprestressed and prestressed beams reinforced with near surface mounted carbon fibre reinforced polymer cfrp bars under monotonic and fatigue loading. Fatigue flexural behaviour of reinforced concrete beams with nonprestressed and prestressed basalt fiber reinforced polymer bars by taha younes a thesis presented to the university of waterloo in fulfilment of the thesis requirement for the degree of master of applied science in civil engineering waterloo, ontario, canada, 2015. Twelve out of 16 reinforced concrete beams with variable fiber contents were tested under constant amplitude cyclic loading.
Fatigue behavior of glass fiberreinforced polymer bars. Lot of research work had been done on steel fiber reinforced concrete and lot of. The ac1 440 and csa s806 recommendations are conservative estimates. Fatigue behavior of reinforced concrete beams strengthened with different frp laminate configurations by r.
Hooksflexural fatigue strength of steel fiber reinforced concrete beams. The addition of steel fibers enhanced the strength and increased the ductility and flexural stiffness of the tested beams. Fatigue resistance of steel fiberreinforced concrete deep. Behaviour of steel fibre reinforced concrete beam under cyclic loading. Fatigue behavior of reinforced concrete beams strengthened. The shape and geometry of the beams followed the rilem recommendation, i. Therefore, the fatigue lives of rc beams reinforced with prestressed cfrp or without prestressed cfrp can be obtained by the fatigue lives of the tensile steel.
The performance of steel fiber reinforced concrete under flexural fatigue loading is examined in terms of fiber content 0. Bond behaviour of concrete beams with glass fibre reinforced polymer bars under fatigue loading by ayman sabry shihata a thesis presented to the university of waterloo. First, the cooper fatigue test machine was used to conduct the fourpoint bending fatigue tests. Pdf behaviour of steel fibre reinforced concrete beam. The fatigue behaviour of tension lap spliced reinforced. Tthe beams and slabs were then exposed to a standard fire.
Forty concrete beams were cast and tested in seven groups. Read flexural fracture and fatigue behaviour of steelfibrereinforced concrete structures, international journal of fatigue on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. The ratio of the axial rigidity of the tensile steel bar k s to the axial rigidity of fiber reinforced polymer frp strengthening k f plays a significant role in extending the fatigue life of steel and thus of rc frp strengthened beams. Analysis of structural behaviour of road test rigid pavements. Pdf shear behaviour of steel fibre reinforced concrete beams. Steel fibre reinforced concrete sfrc is popular frc material that is being studied to improve the structural behaviour of members under different load conditions.
The test results are analyzed to demonstrate the effects of these considered variables on the tested reduced we ight concrete beams. The study compares the behavior of reinforced concrete beams cast either with control scc and the. Flexural fatigue strength, endurance limit, and impact. The fatigue response of beams were externally strengthened with prestressed frp laminates and load carrying capacity of beams with prestressed frp is obviously larger than that of those with nonprestressed frp and also the ductility of the. This paper presents testing results of thirteen smallscale beams strengthened using carbon fiber reinforced polymer composites tested under repeated loads to investigate their fatigue behavior. When used in beams with stirrups, steel fibres significantly improve their shear strength. Pdf fatigue behaviour of reinforced concrete beams with. Fatigue behaviour of asphalt concrete beams reinforced by. The fatigue behaviour of tension lap spliced reinforced concrete beams strengthened with fibre reinforced polymer wrapping by rayed alyousef a thesis presented to the university of waterloo in fulfillment of the thesis requirement for the degree of doctor of philosophy in civil engineering waterloo, ontario, canada, 2016 rayed alyousef 2016. Design of fibre reinforced concrete beams and slabs. A total of 28 simply supported beams with a shear spantoeffective depth ratio of approximately 3. The results of an experimental investigation on the fatigue characteristics and residual strength of steel fiber reinforced concrete sfrc are reported. This paper presents to study the behaviour of reinforced concrete beam cast at different types of steel fibre in the concrete matrix and subjected to fatigue loading. The experimental work included in this investigation is comprised of tests on seven normally reinforced and fiber reinforced concrete beams in combined bending and shear.
Flexural behavior of steel fiber reinforced concrete beams. This paper presents experimental work to investigate the strength and cracking characteristics of optimised selfconsolidating and vibrated rubberised concrete mixtures withwithout steel fibres sfs using largescale reinforced concrete beams. Fiber reinforced polymer frp bars have been widely applied in civil engineering. Shear behavior of steel fiberreinforced concrete beams. Lowcycle flexural fatigue behavior of concrete beam. About fatigue life prediction of forged steel crank shaft pdf is not asked yet. Experimental results show that the shear behaviour of fibre reinforced concrete beams without conventional reinforcement is similar to, or even better than that of beams with stirrups.
Three sets of steel fibre reinforced concrete beams are made with 0%, 1%, and 2% steel fibres by volume. Effect of material properties on fatigue behavior of fiber. Fatigue and overloading behavior of steel concrete composite flexural members strengthened with high modulus cfrp materials m. Fatigue behaviour of steel fibre reinforced concrete sfrc with flyash. Introduction to steel fiber reinforced concrete on. This, together with the equilibrium and compatibility equations for the cracked element, are used to predict the response of steel fiber. In 10 of the beams, sfr was used in combination with a relatively small amount of ordinary reinforcement, which should ensure sufficiently ductile structural behaviour. So, in order to improve the tensile properties, short fibers are used. The testing program included flexural specimens as well as splitcylinders and cubes reinforced with two fiber types at a low volume content. Abstract concrete structure strengthening by using carbon nano tube, steel fiber and dust of cement addition that material to the. The effect of steel fibers on the behavior and strength of reinforced concrete beams under shear is studied. Fibre reinforced polymer bars are geometrically similar to conventional.
Relatively few tests have been carried out on shear in fiber reinforced concrete beams. Flexural fatigue performance of steel fiber reinforced. The flexural static and fatigue behavior of sfrc beams is investigated regarding to experimental results of. Beams reinforced with gfrp reinforcing bars are more sensitive to size effect than equivalent steel reinforced concrete beams. As per the previous studies on the flexural fatigue behavior of steel fiber reinforced concrete sfrc beams 3536373839 40, the presence of steel fibers could promote fatigue. It has been observed that the ultimate flexural strength of glass fiber reinforced selfcompacting concrete beams at 0. Steel fibre reinforced concrete sfrc is a composite materials for instance, flexural, tensile and shear strength, toughness, impact resistance, crack resistance, and resistance to frost damage can be improved by the use of steel fibres.
These loads can result in a steady decrease in the stiffness of the structure and cause damage at a micro level that eventually leads to a fatigue failure. Bond behaviour of beams reinforced with near surface mounted. A semiempirical equation is proposed to estimate the effective moment of inertia of simply supported highstrength fiber reinforced concrete beams. Fatigue behaviour of steel fiber reinforced concrete sciencedirect. Experimental study on flexural behavior of concrete beams. Pdf flexural behavior of steel fiber reinforced concrete. Flexural fracture and fatigue behavior of steelfiber. Static and fatigue behaviour of frpreinforced concrete beams. Structural behaviour of reinforced concrete elements improved by layers of ultra high performance reinforced concrete john wuest1 abstract the investigated composite elements combine a reinforced concrete central core with two uhpfrc layers with the objective to increase the load carrying capacity and to improve durability. Static and fatigue behaviour of frp reinforced concrete beams and a shm system with fiber optic sensors under different weathering conditions. The concrete matrix compressive strength was about 88 mpa 12,800 psi. The steel fibers prolonged the fatigue life in sfrc beams by reducing the stress level in the tensile reinforcement.
Use of carbon fiber laminates for strengthening reinforced concrete beams in bending habibur rahman sobuz et. Flexural fatigue strength prediction of steel fibre reinforced concrete. Testing and modelling of steel fibre reinforced concrete. Foster, shear strength of steel fibre reinforced concrete beams with stirrups. Results from a series of flexural fatigue tests, on plain and fiber reinforced concrete flexural specimens, are. Franzen department of civil and environmental engineering division of structural engineering concrete structures chalmers university of technology abstract. The study on the introduction of effect of steel fibers can be still promising as steel fiber reinforced concrete is used for sustainable and longlasting concrete structures. Bending tests were carried out to examine the effect of low fiber content 0. Structural behaviour of reinforced concrete beams containing. Aashto and response2000 were able to predict the behaviour more accurately than the ac1 440 and the csa s806 methods. This paper presents the results of an experimental study to investigate the tensile fatigue mechanical properties of glass fiber reinforced polymer gfrp bars after elevated temperatures exposure.
Fatigue behavior of concrete beams reinforced with glass and carbon fiber reinforced polymer gfrpcfrp bars after exposure to elevated temperatures author links open overlay panel jun zhao a guanghui li b zike wang a xiaoling zhao c. Fatigue behavior of concrete beams reinforced with glass. The fiber reinforced concrete beam contains steel fibers in at the rate of 0%, 0. Pdf fatigue behaviour of steel fibre reinforced concrete sfrc. Although there has been growing interest and field applications of poststrengthening concrete structures using carbon fiber reinforced plastic cfrp laminates, very little information exists regarding the flexural fatigue behavior of reinforced concrete beams strengthened with cfrp. This behavior has also been found in rc beams strengthened with prestressed cfrp 21. Use of carbon fiber laminates for strengthening reinforced. As a result of this ability to arrest cracks, fibre composites possess. The experiments of highstrength steel fiber reinforced concrete sfrc beams subjected to fatigue bend loading were conducted in this work. The morphology of steel surfaces using the inhibitor after observing the scanning electron microscope showed a low layer of corrosion products. Fatigue behavior of largescale reinforced concrete beams. Principal stressstrain relations are proposed for the cracked steel fiber rienforced concrete.
Fatigue behaviour of steel fiber reinforced concrete. Analysis of fiber reinforced concrete beams under combined. Study of flexural strength in steel fibre reinforced concrete. Steel fibers are widely used as a fiber reinforced concrete all over the world. Experimental tests of steel fibre reinforced concrete beams. This study aims to investigate the impact resistance of fibre reinforced concrete frc, incorporated with steel fibres at various dosages.
Structures such as bridges, airport runways, marine installations, and railway tracks are often subjected to cyclic loads. At that time, it was considered to be one of the worlds most modern and straightforward handbooks on the design of steel fibre reinforced concrete structures. Behaviour of shearcritical reinforced concrete beams. Flexural fatigue strength prediction of steel fibre. Steel fiber reinforced concrete sfrc has the ability of excellent tensile strength, flexural strength, shock resistance, fatigue resistance, ductility and crack arrest. Standard compression tests are conducted on concrete cylinders made with concrete having different amount of steel fibres to investigate compression behaviour of steel fibre reinforced concrete. Sharma there is an iucrea ing interest in the use of teel fibers to improve th properties of oncretc. The relationship between loading, strain and midspan deflection of the beams was observed under the threepoint loading system. Flexural fatigue strength and failure probability of self.
Pdf on nov 26, 2012, a parvez and others published fatigue behaviour of reinforced concrete beams with addition of steel fibres find, read. Article information, pdf download for flexural fatigue strength of. Shear strength of fiber reinforced concrete beams was studied in this research project. Pdf fatigue behaviour of reinforced concrete beams with addition. Steel fiber reinforced concrete nguyen van chanh 1 summary it is now well established that one of the important properties of steel fibre reinforced concrete sfrc is its superior resistance to cracking and crack propagation. Studies examined experimentally the flexural behavior of concrete beams reinforced with the hybrid frp steel rebar but very few among them evaluated their fatigue performance. Shearfatigue behavior of steel fiber reinforced concrete. Four reference beams were tested under static conditions. Shear strength of steel fiber reinforced concrete beams. The aim of this study was to evaluate the enhancement effect of asphalt concrete beams reinforced by glass fibre reinforced plastics gfrp. Bending behavior and deflection prediction of high.
Flexural fatigue strength of steel fibrous concrete beams. Analysis of fiber reinforced concrete beams under combined loadings a. The swedish concrete association published a report on steel fibre reinforced concrete in 1995. Fatigue flexural behaviour of reinforced concrete beams. Experimental studies investigating the flexural behavior of six concrete beams were conducted with various reinforcements, including ordinary steel bars, steelfiber reinforced polymer composite bars, pure fiber reinforced polymer bars either carbon fiber reinforced polymer bars or basalt fiber reinforced polymer bars, and hybrid bars steel bars and basalt fiber reinforced polymer bars. The influence of fiber content in the concrete deep beams has been studied by measuring the deflection of the deep beams and by observing the crack patterns. This study performs dropweight impact tests to investigate the behaviour of concrete beams reinforced by different types of steel fibres. Durability of steel fibres reinforcement concrete beams in. Twelve beams were cast and tested to study their flexural behavior. According to the experimental findings, the mechanism of fatigue failure in reinforced beams was presented, and the corresponding empirical equations were established for the. The fatigue properties of concrete beams reinforced with carbon fiber reinforced polymeroptical fiber bragg grating cfrpofbg plates under threepoint bending constant cyclic loading were experimentally studied. This paper presented the effect of the combination of an inhibitor and steel fibre reinforced concrete sfrc for concrete structures in chloride environments.
Pdf behavior of steel fibre reinforced concrete in compression. When used in beams with stirrups, steel fibres significantly improve their shear. Flexural and shear behavior of steel fiber reinforced scc beams. Sumner3 civil, construction and environmental engineering, north carolina state university, raleigh, nc, 276957533. Fatigue behaviour of steel fibre reinforced concrete beams. Fracture behaviour of steel fibrereinforced concrete at a.
Reinforced concrete beams with steel fibers under shear. Regarding to that, this research studies on the behavior and the deflection of the simply supported reinforced concrete slab containing 1% volume of friction steel fiber due to bending test. Confirming to is 5161959 15 in present work weigh batching hand mixing is used to study cube compression test, flexural test on beams, on plain and steel fibre reinforced concrete sfrc were carried on number of samples. Most of the studies on steel fibre reinforced concrete were mainly confined to the determination of its flexural fatigue endurance limit for different typevolume fractionaspect ratio of fibres batson et al. These studies revealed a significant size effect on the flexural behaviour of beams made up of different types of concretes. Shear behaviour of fiber reinforced concrete beams. Experimental study on flexural behaviour of glass fiber. The beams used for tests were sfrc beam of size 700 mm x 150 mm x 150 mm used hook end steel fibers in the concrete for determining flexural strength of concrete. In this study, the fatigue test has been performed, and an analytical model for simulating the flexural fatigue behavior of the concrete beam reinforced with the hybrid bar considering its postyielding behavior is. The investigation was conducted to study the fatigue behavior of steel fiber reinforced highstrength concrete sfrhsc beams.
Fatigue behavior of steelfiberreinforced concrete beams. This study investigates and compares fatigue behavior of forged steel and powder metal connecting rods. Size effect on flexural behaviour of reinforced high strength. Behaviour of reinforced concrete beams with kenaf and steel hybrid fibre sharifah maszura syed mohsin, muhd fareez manaf, noor nabilah sarbini and khairunisa muthusamy faculty of civil engineering, universiti teknologi malaysia, johor bahru, johor darul takzim, malaysia email. Effects of steel fibers on flexural performance of reinforced concrete rc beams are the main objectives of this study. Study of flexural strength in steel fibre reinforced concrete patil shweta1, rupali kavilkar2 1,2department of architecture, gogte institute of technology, belgaum, karnataka, 590006 abstract concrete possesses a very low tensile strength, limited ductility and little resistance to cracking. Experimental investigation of fiber reinforced concrete beams. Pdf concrete pavements under repetitive loading prematurely fail due to. Fatigue behavior of prefatigued reinforced concrete beams. Fatigue life prediction of reinforced concrete beams. Fibre reinforced concrete frc material is a developed concrete that has been proposed to improve the tensile behaviour of the concrete using fibres in the concrete mix. Keywords compressive strength, ductility, flexural strength, fibre reinforced concrete, steel fiber.
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