Fatigue behavior of corroded reinforced concrete beamsa. The flexural fatigue behaviour of the beams was analysed, utilising an instron servohydraulic four points bending apparatus testing, and different load parameters. Fatigue behavior of carbon fiber reinforced polymer. The investigation was conducted to study the fatigue behavior of steel fiber reinforced highstrength concrete sfrhsc beams. An extensive experimental investigation was planned in which 127 sfrc beam specimens 100 x 100 x 500 mm in size were tested under fourpoint flexural fatigue. Shear strength of fiber reinforced concrete beams was studied in this research project. Test and design methods for steel fiber reinforced concrete.
Introduction to steel fiber reinforced concrete on. Fatigue behaviour of steel fiber reinforced concrete sciencedirect. Flexural behavior of steel fibre reinforced high strength. Introduction the behaviour of concrete beams under fatigue load is still in the beginning of research 1. The steel fibers prolonged the fatigue life in sfrc beams by reducing the stress level in the tensile reinforcement. Fatigue behavior of glass fiberreinforced polymer bars.
It had been concluded that fibre reinforced concrete beam column joint frc increased first crack load and ultimate load comparing with the high performance concrete hpc. Fatigue flexural behaviour of corroded rc beams strengthened. Based on the most new study information, the production on fatigue of corroded concrete beams was listed and analyzed, and the problems on fatigue of corroded concrete beams were indicated. Jul 12, 2011 fatigue behaviour of reinforced concrete beams with corroded steel reinforcementgroup 11priyadarshani s.
The use of steel fiber reinforced concrete has received much attention in concrete industry as more research is beading for formed and more is being understood about its material properties and behavior. Prestress losses and flexural behavior of reinforced concrete beams strengthened with posttensioned cfrp sheets journal of composites for construction september 2011 fatigue behavior of externally strengthened concrete beams with fiber reinforced polymers. Effect of steel fibre content on the fatigue behaviour of. This article presents an experimental and numerical study on the fatigue behaviour of defected steel beams strengthened with carbon fibrereinforced polymer laminates, with a special focus on the effect of interfacial debonding. Fatigue behavior of steelfiberreinforced concrete beams. Steel fibers are widely used as a fiber reinforced concrete all over the world. Fatigue behaviour of steel fibre reinforced concrete beams and prestressed sleepers. 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. Pdf on nov 26, 2012, a parvez and others published fatigue behaviour of reinforced concrete beams with addition of steel fibres find, read and cite all the research you need on researchgate. In the present study, reinforced concrete beams with fiber volume fractions of 1 and 2 percent, with and without stirrups, were investigated. 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. Static and fatigue behaviour of frpreinforced concrete beams. Typical mix designs for steel fibre shotcrete are given in table 2. Experimental investigation of fiber reinforced concrete beams.
Twelve out of 16 reinforced concrete beams with variable fiber contents were tested under constant amplitude cyclic loading. An experimental investigation was planned in which 180 sfrc beam specimens of size 100. With respect to reinforced concrete, the fatigue strength of the steel reinforcement is determinant. Results indicate that the fatigue behavior of such retrofit beams is controlled by the fatigue behavior of the reinforcing steel.
The fatigue life of a reinforced concrete beam can be increased by the application of an frp retrofit, which relieves some of the stress carried by the steel. Fatigue behavior of steel fiber concrete in direct tension vector. Motavalli, analytical calculation of stress intensity factor of cracked steel ibeams with experimental analysis and 3d digital. Steel fibre reinforced concrete beamcolumn joint a. Fatigue behaviour of concrete beams posttensioned with. This study investigates fatigue behaviour and failure of transversely restrained precast reinforced concrete rc deck slabs with and without steel fibres sf in a novel deconstructable steel concrete composite deck that takes advantage of bolted shear connectors. Fatigue behaviour of cracked steel beams retrofitted with. The sfrc beams were divided in to six different groups based on their spandepth ratio. Flexural fatigue strength prediction of steel fibre. When used in beams with stirrups, steel fibres significantly improve their shear strength. In general, the cfrp posttensioned beams performed satisfactorily in fatigue, in comparison with the steel posttensioned beams, as long as premature failure of the tendons near the anchor location was prevented. Pdf flexural fatigue analysis of steel fiberreinforced. Request pdf fatigue behavior of steelfiberreinforced concrete beams structures such as bridges, airport runways, marine installations. Fatigue and flexural behavior of reinforcedconcrete beams.
Flexural fatigue strength of steel fibrous concrete. 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. Several sizes of steel fibers were used as reinforcement in concentrations of 2. The digital image correlation dic technique enables straightforward crack detection and can be used to measure the actual mechanical behavior of a full scale reinforced concrete beam under monotonic and fatigue. This paper reports investigation conducted to study the fatigue performance of steel fibre reinforced concrete sfrc containing fibres of mixed aspect ratio. The fatigue performance of plain concrete and frc, as reported in the literature, is compared in. The final failure pattern of rc beam is shown in fig.
Results from a series of flexural fatigue tests, on plain and fiber reinforced concrete flexural specimens, are. Flexural fatigue performance of steel fiber reinforced. Presented in partial fulfillment of the requirements. Kavita s kene, vikrant s vairagade and satish sathawane. Structural health monitoring shm techniques are often used for detecting damage and diagnosing the structural conditions. Four reference beams were tested under static conditions. S rangasamy college of technology, namakkal, tamil nadu 2 assistant professor, k. Flexural fatigue strength prediction of steel fibre reinforced concrete. As per the previous studies on the flexural fatigue behavior of steel fiber reinforced concrete sfrc beams 3540, the presence of steel fibers. Using digital image correlation to evaluate fatigue. The swedish concrete association published a report on steel fibre reinforced concrete in 1995. This paper presents results of fatigue tests for the determination of the fatigue behaviour of reinforced concrete rc slablike beams. It is also observed that steel reinforced beam deflection is 5. Shearfatigue behavior of steel fiber reinforced concrete beams.
Fatigue behaviour of steelfibrereinforced concrete beams. Static and fatigue behaviour of frpreinforced concrete. Fatigue behaviour of steel fiber reinforced concrete. The beams dimension was 200 mm in width and 2000 in length. The results showed that the failure load and ductility of the strengthened beam with the abovementioned configuration increased more as compared to other strengthening. Pdf fatigue behaviour of steel fibre reinforced concrete sfrc. Fatigue behavior of cracked steel beams reinforced by using. Shear fatigue behavior of steel fiber reinforced concrete beams. The possibility of substituting traditional transverse reinforcement stirrups for steel fibres in precast elements can significantly reduce production costs. Pdf fatigue behaviour of reinforced concrete beams with.
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. Sharma there is an iucrea ing interest in the use of teel fibers to improve th properties of oncretc. This paper presents testing results of thirteen smallscale beams strengthened using carbon fiberreinforced polymer composites tested under repeated loads to investigate their fatigue behavior. In addition the ruhpfrc layer is waterproof which provides improved durability. 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. In recent years, fiber reinforced polymer frp composites are increasingly applied in civil engineering due to their merits, such as high strengthweight and stiffnessweight ratios, fatigue resistance, electromagnetically transparent, and easy construction.
An overview of the fatigue behaviour of plain and fibre reinforced. Fiber reinforced concrete frc is a concrete in which small and discontinuous fibers are dispersed uniformly. Analysis of fiber reinforced concrete beams under combined loadings a. According to the experimental findings, the mechanism of fatigue failure in reinforced beams was presented, and the corresponding empirical equations were established for the. 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 developed. The results of this study indicate that the use of cfrp sheets for strengthening corroded rc beams is an efficient technique that can maintain the structural integrity and enhance the structural behaviour of such beams. Fracture and fatigue tests were performed in order to investigate the fracture and fatigue behavior of steel fibre reinforced concrete sfrc structures. 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. Hooksflexural fatigue strength of steel fiber reinforced concrete beams. Three types of steel fibres have been used in the tests with a view to formulate design guidelines for steel fibre reinforced concrete beams, with conventional reinforcements, subjected to fatigue. Fatigue behaviour of steel fibre reinforced concrete sfrc with flyash. The fatigue behaviour of tension lap spliced reinforced. Prediction of fatigue life of reinforced concrete bridges. Experimental study on behavior of steel and glass fiber reinforced concrete composites.
The tested beams were made of m35 concrete and reinforced with basalt bars with 10 mm diameter. Shearfatigue behavior of steel fiber reinforced concrete. 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. 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. Shear behaviour of steel fibre reinforced concrete beams. Fatigue behavior of reinforced concrete beams strengthened. As widely observed from the fatigue tests on rc beams strengthened without prestressed cfrp in earlier times, the fracture of tensile steel bars at the main cracked section is the controlling failure mode.
However, few experimental tests have been carried out under fatigue loading. Fatigue resistance of steel fiberreinforced concrete deep beams. The paper presents results of an investigation carried out to study the flexural fatigue strength of steel fibre reinforced concrete sfrc. S rangasamy college of technology, namakkal, tamil nadu 3. Pdf concrete pavements under repetitive loading prematurely fail due to. Fatigue behaviour of reinforced concrete beams with corroded. Behaviour of singly reinforced concrete beams reinforced with.
Fatigue life prediction of reinforced concrete beams. There is a vast scope for application of fibre reinforced concrete in the present construction and in insitu repair works. Investigation of flexural fatigue behavior of concrete. Behaviour of singly reinforced concrete beams reinforced. Flexural fracture and fatigue behavior of steelfiber.
In addition, the prediction of fatigue life according to the portland cement association and corps of engineers models were compared with the. Effect of material properties on fatigue behavior of fiber reinforced self compacting concrete beam ahmed s. The paper presents results of an investigation carried out to study the fatigue strength of steel fiberreinforced concrete sfrc. Fatigue resistance of steel fiberreinforced concrete deep. Fatigue behaviour of steel fibre reinforced concrete beams. The fatigue relevant parameters are the stress ranges, the number of fatigue cycles and stress concentrations. The beams dimensions were 2200 mm in length, 350 mm in height and 250 mm in width. In this research, steel fibre was added to portland cement concrete at 20 kgm 3 and 60 kgm 3 to improve fatigue resistance, which could allow for thinner pavements and hence lower construction costs. This behavior has also been found in rc beams strengthened with prestressed cfrp 21. For the beams with concrete cover of 25 mm the beams height and depth to the. Static and fatigue behaviour of frp reinforced concrete beams and a shm system with fiber optic sensors under different weathering conditions. Fatigue behaviour of transversely restrained precast steel. To solve steel corrosion, frp bars are being used instead of steel bars in concrete structures due to their.
Tensile characterization studies were also performed on 10mm basalt bars. As a new type of structural material in civil engineering, fiber reinforced polymer frp has become an important supplement to traditional materials in civil engineering due to its excellent mechanical, physical and chemical properties 1,2,3. Fatigue tests found that the failure of the beam is usually due to breaking of fibers rather than fiber pullout. Load vs displacement of steel reinforced beam as shown in fig.
Flexural behaviour of reinforced concrete beam containing. For the main study, thirty reinforced concrete beams were cast and tested under monotonic and fatigue loading. Steel slag reinforced concrete ssrc, structural behavior, failure mode, ductile behavior, strain characteristics, crack study. In the present paper, the shear behaviour of prestressed elements has been investigated by means of experimental tests on full scale beams. Reinforced concrete structural elements using vector2 benard isojeh frank vecchio december, 2017. Heffernan and erki found that cfrp shared part of the stress with the main steel bars in rc beams and improved the fatigue performance of beams. Shear behaviour of steel fibre reinforced concrete beams article pdf available in materials and structures 383. Fatigue behavior of concrete beams reinforced with glass. Pdf behaviour of steel fibre reinforced concrete beam. Experimental study on behavior of steel and glass fiber.
Experimental study on flexural behavior of concrete beams. Fatigue behaviour of bridge deck slab elements strengthened. When steel fibers are added to high strength concrete to increase. Different ranging of steel fibres was used in this study. Fatigue flexural behaviour of reinforced concrete beams. Fatigue of corroded rc beams is a key problem for the existing corrosiondamaged concrete bridges. Fatigue behavior of prefatigued reinforced concrete beams. Fatigue behavior of largescale reinforced concrete beams. Fibre optic sensors fos are found to be very accurate and durable for outdoor applications including embedment in reinforced concrete structures. Fifty three beams were cast and tested under monotonic and fatigue loading. Study of flexural strength in steel fibre reinforced concrete.
Pdf shear behaviour of steel fibre reinforced concrete beams. Flexural fatigue strength, endurance limit, and impact. Prediction of mean and design fatigue lives of steel fibrous. Fatigue behavior of reinforced concrete beams strengthened with different frp laminate configurations by r. Steel fibre reinforced concrete research efforts are also in progress in the use of vegetables fibres and polymer impregnated glass fibres. 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. Later, these rc beams were rehabilitated with nsm cfrp reinforcement and tested under the same cyclic stress range of the reference specimens. 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. Tests concern beams with conventional as well as steel fibre reinforcement. The results of flexural fatigue testing of steel fiber reinforced concrete beams are reported.
The aim of the present research is the experimental investigation of the response of carbon fiber reinforced polymer cfrp strengthened reinforced concrete rc beams of large scale under fatigue loading. At present, frp composite materials in civil engineering mainly include four categories based on the form of application. The design of reinforced concrete and prestressed concrete structures subjected to cyclic loading, such as bridge deck slabs, bridge girders, railway tracks, and offshore installations, necessitate the consideration of fatigue. Bond behaviour of concrete beams with glass fibre reinforced. Fatigue behavior of steel fiber reinforced high strength concrete. Hardened concrete properties flexural fatigue behavior the fatigue properties of frc were evaluated thoroughly in this study. Structures such as bridges, airport runways, marine installations, and railway tracks are often subjected to cyclic loads. It has been observed that the ultimate flexural strength of glass fiber reinforced selfcompacting concrete beams at 0. Keywords compressive strength, ductility, flexural strength, fibre reinforced concrete, steel fiber. The behavior of steel fibers in enhancing the fatigue life of deep beams and reducing the conges tion of reinforcement in concrete is studied, and the possibility of. The relationship between loading, strain and midspan deflection of the beams was observed under the threepoint loading system. Behaviour of steel fibre reinforced concrete beam under cyclic loading. 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 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.
Lowcycle flexural fatigue behavior of concrete beam. Flexural fatigue strength prediction of steel fibre reinforced concrete beams. Harries, fatigue behavior of damaged steel beams repaired with cfrp strips, eng struct, 335 2011, 14911502. The hybrid steel fibre reinforced concrete increases the strength, stiffness and energy dissipation when compared with conventional specimen and also efficiently used for seismic areas. Experimental study on flexural behaviour of glass fiber. Abstract concrete structure strengthening by using carbon nano tube, steel fiber and dust of cement addition that material to the. A particular fibre type, orientation and percentage of fibers, the workability of the mix. Shear strength of steel fibre reinforced concrete beams with stirrups, engineering structures, vol.
Fatigue behaviour of concrete beams posttensioned with unbonded carbon fibre reinforced polymer tendons. Beams made with plain concrete and concretes reinforced with 0. Abstract concrete is most widely used construction material in the world. Exploitation of ultrahighperformance fibrereinforced. Fatigue behavior of steel fibre reinforced concrete beams. 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. For steel fibre reinforced shotcrete, different considerations apply, with most mix designs being arrived at empirically. In this paper flexure behaviour of concrete with the steel fiber is studied in detail. The beams depth and height were varied depends on the clear concrete cover. 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.
Lot of research work had been done on steel fiber reinforced concrete and lot of researchers work prominently over it. Design of steel fibre reinforced concrete using the w. Effect of material properties on fatigue behavior of fiber. The fatigue behaviour of the steel reinforcement is similar to that of structural steel. Fatigue tests on unstrengthened and cfrpstrengthened reinforced concrete beams have shown that. 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. Each beam was reinforced on the tension side with a single gfrp bar. Design of fibre reinforced concrete beams and slabs. 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. Since these materials seem very suitable for structures that might be prone to fatigue failure, such as bridge decks, the understanding of the static and fatigue. The behavior of the beams under overloading conditions and fatigue loading conditions was studied as well as the. A set of specimens with and without twelve exposure to various environmental conditions have been tested under static and fatigue loads to determine the effectiveness of the. The shear strength was obtained performing both linear and nonlinear regression analysis of each data base. Request pdf fatigue behavior of steelfiberreinforced concrete beams structures such as bridges, airport runways, marine installations, and railway tracks are often subjected to cyclic loads.
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