Fatigue behaviour of reinforced concrete beams with corroded. Fatigue behaviour of concrete beams posttensioned with. It has been observed that the ultimate flexural strength of glass fiber reinforced selfcompacting concrete beams at 0. When steel fibers are added to high strength concrete to increase. The possibility of substituting traditional transverse reinforcement stirrups for steel fibres in precast elements can significantly reduce production costs. Exploitation of ultrahighperformance fibrereinforced. Experimental study on behavior of steel and glass fiber. 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.
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. Fatigue behavior of steelfiberreinforced concrete beams. Fatigue behavior of steel fiber reinforced high strength concrete. Prediction of mean and design fatigue lives of steel fibrous. Fiber reinforced concrete frc is a concrete in which small and discontinuous fibers are dispersed uniformly. The fatigue behaviour of the steel reinforcement is similar to that of structural steel. 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. Steel fibers are widely used as a fiber reinforced concrete all over the world. 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. To solve steel corrosion, frp bars are being used instead of steel bars in concrete structures due to their. 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. Keywords compressive strength, ductility, flexural strength, fibre reinforced concrete, steel fiber. Fatigue behaviour of transversely restrained precast steel.
Fatigue of corroded rc beams is a key problem for the existing corrosiondamaged concrete bridges. The steel fibers prolonged the fatigue life in sfrc beams by reducing the stress level in the tensile reinforcement. Static and fatigue behaviour of frp reinforced concrete beams and a shm system with fiber optic sensors under different weathering conditions. Lot of research work had been done on steel fiber reinforced concrete and lot of researchers work prominently over it.
In this paper flexure behaviour of concrete with the steel fiber is studied in detail. Hardened concrete properties flexural fatigue behavior the fatigue properties of frc were evaluated thoroughly in this study. The fatigue performance of plain concrete and frc, as reported in the literature, is compared in. 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.
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. Fatigue tests on unstrengthened and cfrpstrengthened reinforced concrete beams have shown that. 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. Abstract concrete is most widely used construction material in the world. Hooksflexural fatigue strength of steel fiber 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. Steel fibre reinforced concrete beamcolumn joint a.
Results from a series of flexural fatigue tests, on plain and fiber reinforced concrete flexural specimens, are. The tested beams were made of m35 concrete and reinforced with basalt bars with 10 mm diameter. Steel fibre reinforced concrete research efforts are also in progress in the use of vegetables fibres and polymer impregnated glass fibres. An experimental investigation was planned in which 180 sfrc beam specimens of size 100. As per the previous studies on the flexural fatigue behavior of steel fiber reinforced concrete sfrc beams 3540, the presence of steel fibers. Prediction of fatigue life of reinforced concrete bridges. For the beams with concrete cover of 25 mm the beams height and depth to the. Shear strength of fiber reinforced concrete beams was studied in this research project. The fatigue relevant parameters are the stress ranges, the number of fatigue cycles and stress concentrations. For steel fibre reinforced shotcrete, different considerations apply, with most mix designs being arrived at empirically. 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. This paper presents results of fatigue tests for the determination of the fatigue behaviour of reinforced concrete rc slablike beams.
Fatigue behaviour of steelfibrereinforced concrete beams. In addition, the prediction of fatigue life according to the portland cement association and corps of engineers models were compared with the. Study of flexural strength in steel fibre reinforced concrete. 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. Flexural fatigue performance of steel fiber reinforced. It is also observed that steel reinforced beam deflection is 5. 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.
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. Shearfatigue behavior of steel fiber reinforced concrete beams. Fatigue behaviour of steel fibre reinforced concrete sfrc with flyash. 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. Fatigue resistance of steel fiberreinforced concrete deep beams. Typical mix designs for steel fibre shotcrete are given in table 2. 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. Experimental study on flexural behaviour of glass fiber. This paper reports investigation conducted to study the fatigue performance of steel fibre reinforced concrete sfrc containing fibres of mixed aspect ratio. The final failure pattern of rc beam is shown in fig.
However, few experimental tests have been carried out under fatigue loading. Abstract concrete structure strengthening by using carbon nano tube, steel fiber and dust of cement addition that material to the. Fatigue flexural behaviour of reinforced concrete beams. Fatigue flexural behaviour of corroded rc beams strengthened. For the main study, thirty reinforced concrete beams were cast and tested under monotonic and fatigue loading. Request pdf fatigue behavior of steelfiberreinforced concrete beams structures such as bridges, airport runways, marine installations. Using digital image correlation to evaluate fatigue. Four reference beams were tested under static conditions. 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. Test and design methods for steel fiber reinforced concrete. 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. Tests concern beams with conventional as well as steel fibre reinforcement. The beams depth and height were varied depends on the clear concrete cover. 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.
Tensile characterization studies were also performed on 10mm basalt bars. Design of fibre reinforced concrete beams and slabs. Fatigue behavior of glass fiberreinforced polymer bars. The flexural fatigue behaviour of the beams was analysed, utilising an instron servohydraulic four points bending apparatus testing, and different load parameters. Sharma there is an iucrea ing interest in the use of teel fibers to improve th properties of oncretc.
Experimental study on flexural behavior of concrete beams. Presented in partial fulfillment of the requirements. Fatigue behavior of largescale reinforced concrete beams. Shear behaviour of steel fibre reinforced concrete beams article pdf available in materials and structures 383.
Experimental study on behavior of steel and glass fiber reinforced concrete composites. Fatigue behaviour of steel fiber reinforced concrete. Shear strength of steel fibre reinforced concrete beams with stirrups, engineering structures, vol. Several sizes of steel fibers were used as reinforcement in concentrations of 2. There is a vast scope for application of fibre reinforced concrete in the present construction and in insitu repair works.
Pdf shear behaviour of steel fibre reinforced concrete beams. Pdf flexural fatigue analysis of steel fiberreinforced. Reinforced concrete structural elements using vector2 benard isojeh frank vecchio december, 2017. S rangasamy college of technology, namakkal, tamil nadu 2 assistant professor, k.
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. Analysis of fiber reinforced concrete beams under combined loadings a. Pdf fatigue behaviour of steel fibre reinforced concrete sfrc. With respect to reinforced concrete, the fatigue strength of the steel reinforcement is determinant. This behavior has also been found in rc beams strengthened with prestressed cfrp 21. Fatigue behaviour of steel fibre reinforced concrete beams and prestressed sleepers. Introduction the behaviour of concrete beams under fatigue load is still in the beginning of research 1. 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. Flexural behaviour of reinforced concrete beam containing. Each beam was reinforced on the tension side with a single gfrp bar. The sfrc beams were divided in to six different groups based on their spandepth ratio.
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. Investigation of flexural fatigue behavior of concrete. The swedish concrete association published a report on steel fibre reinforced concrete in 1995. Effect of steel fibre content on the fatigue behaviour of. Pdf behaviour of steel fibre reinforced concrete beam.
Fatigue behaviour of concrete beams posttensioned with unbonded carbon fibre reinforced polymer tendons. The paper presents results of an investigation carried out to study the fatigue strength of steel fiberreinforced concrete sfrc. The relationship between loading, strain and midspan deflection of the beams was observed under the threepoint loading system. Fatigue behavior of carbon fiber reinforced polymer. When used in beams with stirrups, steel fibres significantly improve their shear strength. 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. Jul 12, 2011 fatigue behaviour of reinforced concrete beams with corroded steel reinforcementgroup 11priyadarshani s. Fatigue behavior of reinforced concrete beams strengthened. This paper presents testing results of thirteen smallscale beams strengthened using carbon fiberreinforced polymer composites tested under repeated loads to investigate their fatigue behavior. Flexural fatigue strength prediction of steel fibre reinforced concrete beams. The results showed that the failure load and ductility of the strengthened beam with the abovementioned configuration increased more as compared to other strengthening.
Steel slag reinforced concrete ssrc, structural behavior, failure mode, ductile behavior, strain characteristics, crack study. 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. Fatigue behavior of concrete beams reinforced with glass. Fracture and fatigue tests were performed in order to investigate the fracture and fatigue behavior of steel fibre reinforced concrete sfrc structures. Fibre optic sensors fos are found to be very accurate and durable for outdoor applications including embedment in reinforced concrete structures. Fatigue behaviour of cracked steel beams retrofitted with.
Fatigue tests found that the failure of the beam is usually due to breaking of fibers rather than fiber pullout. Harries, fatigue behavior of damaged steel beams repaired with cfrp strips, eng struct, 335 2011, 14911502. Fatigue behavior of steel fibre reinforced concrete beams. 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 the present study, reinforced concrete beams with fiber volume fractions of 1 and 2 percent, with and without stirrups, were investigated. At present, frp composite materials in civil engineering mainly include four categories based on the form of application. The investigation was conducted to study the fatigue behavior of steel fiber reinforced highstrength concrete sfrhsc beams. An overview of the fatigue behaviour of plain and fibre reinforced. The paper presents results of an investigation carried out to study the flexural fatigue strength of steel fibre reinforced concrete sfrc.
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. Effect of material properties on fatigue behavior of fiber. Fatigue behaviour of steel fibre reinforced concrete beams. Behaviour of singly reinforced concrete beams reinforced with. 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. Flexural fatigue strength, endurance limit, and impact. Pdf fatigue behaviour of reinforced concrete beams with. Fatigue life prediction of reinforced concrete beams. The behavior of the beams under overloading conditions and fatigue loading conditions was studied as well as the. Fatigue behaviour of bridge deck slab elements strengthened. Shear fatigue behavior of steel fiber reinforced concrete beams. Behaviour of steel fibre reinforced concrete beam under cyclic loading. 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.
Effect of material properties on fatigue behavior of fiber reinforced self compacting concrete beam ahmed s. 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. 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. 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. Fatigue resistance of steel fiberreinforced concrete deep. Bond behaviour of concrete beams with glass fibre reinforced. Flexural fatigue strength prediction of steel fibre. Shear behaviour of steel fibre reinforced concrete beams. The shear strength was obtained performing both linear and nonlinear regression analysis of each data base.
Static and fatigue behaviour of frpreinforced concrete. Load vs displacement of steel reinforced beam as shown in fig. 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. The results of flexural fatigue testing of steel fiber reinforced concrete beams are reported. Introduction to steel fiber reinforced concrete on. Different ranging of steel fibres was used in this study. A particular fibre type, orientation and percentage of fibers, the workability of the mix. Pdf concrete pavements under repetitive loading prematurely fail due to. Fatigue behavior of steel fiber concrete in direct tension vector.
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. S rangasamy college of technology, namakkal, tamil nadu 3. The fatigue behaviour of tension lap spliced reinforced. 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. Experimental investigation of fiber reinforced concrete beams. Fatigue behavior of reinforced concrete beams strengthened with different frp laminate configurations by r. 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. 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. Structures such as bridges, airport runways, marine installations, and railway tracks are often subjected to cyclic loads.
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. In addition the ruhpfrc layer is waterproof which provides improved durability. Design of steel fibre reinforced concrete using the w. Fifty three beams were cast and tested under monotonic and fatigue loading. 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. Behaviour of singly reinforced concrete beams reinforced. Fatigue and flexural behavior of reinforcedconcrete beams. Structural health monitoring shm techniques are often used for detecting damage and diagnosing the structural conditions. Static and fatigue behaviour of frpreinforced concrete beams. In the present paper, the shear behaviour of prestressed elements has been investigated by means of experimental tests on full scale beams. Later, these rc beams were rehabilitated with nsm cfrp reinforcement and tested under the same cyclic stress range of the reference specimens. Motavalli, analytical calculation of stress intensity factor of cracked steel ibeams with experimental analysis and 3d digital. 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.
The beams dimensions were 2200 mm in length, 350 mm in height and 250 mm in width. The beams dimension was 200 mm in width and 2000 in length. Shearfatigue behavior of steel fiber reinforced concrete. Beams made with plain concrete and concretes reinforced with 0. 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. Flexural fatigue strength of steel fibrous concrete.
Fatigue behavior of corroded reinforced concrete beamsa. 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. Fatigue behavior of prefatigued reinforced concrete beams. 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. 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. Kavita s kene, vikrant s vairagade and satish sathawane. Flexural behavior of steel fibre reinforced high strength. 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. Flexural fracture and fatigue behavior of steelfiber.
1190 347 17 973 515 1271 396 380 116 492 196 1384 393 376 1175 184 904 926 639 375 483 829 813 827 265 1499 910 1425 77 497 1125 198 875 1222 660 312 1043 1125 1446 1256 1067