Flexural behaviour of steel fibre-reinforced concrete under cyclic loading
Flexural behaviour of steel fibre-reinforced concrete under cyclic loadingThis paper presents the results of cyclic loading tests on fibre-reinforced concrete (FRC). The main objectiveof this research is to evaluate simultaneously the influence of the workability, the steel fibres and the compressivestrength on the flexural behaviour of FRC under cyclic loading. Prismatic concrete specimens havingdimensions of 150*150* 700 mm were fabricated with concrete of various workability and differentcompressive strengths (30, 60 and 80 MPa) and reinforced with hooked end steel fibres of aspects ratios of65 and 80 at contents of 0.5 and 1%. A four-point bending test with notched specimens was conducted usingDigital Image Correlation technique. The orientation of the fibres, failure modes,…
stress-strain curves for fibre-reinforce concrete
stress-strain curves for fibre-reinforce concreteABSTRACT The paper examines the effects of the addition ofvarious fibres, including fibrillated polypropylene as well asround straight, Duoform, crimped and hooked steel, on thecompressive stress-strain properties of a basic concrete matrix. The ultimate compressive strengths of cube, equivalentcube and prism specimens, with MGA pads to reduce platenfriction, are shown to be only slightly affected whereas thefracture toughness of the fibre reinforced specimens isincreased considerably for all fibres. …
Stress-strain model for concrete under cyclic loading
Stress-strain model for concrete under cyclic loadingA hysteretic stress–strain model is developed for unconfined concrete with the intention of providing efficientmodelling for the structural behaviour of concrete in seismic regions. The proposed model is based on thefindings of previous experimental and analytical studies. The model for concrete subjected to monotonic andcyclic loading comprises four components in compression and tension – an envelope curve (for monotonic andcyclic loading), an unloading curve, a reloading curve and a transition curve. Formulations for partial unloadingand partial reloading curves are also presented. The reliability of the proposed constitutive model is investigatedfor a reinforced concrete member using a non-linear finite-element…
Seismic Behavior of Concrete Columns Confined with Steel and Fiber-Reinforced Polymers
Seismic Behavior of Concrete Columns Confined with Steel and Fiber-Reinforced PolymersResults from an experimental program are presented in which 12356 mm diameter and 1473 mm long columns were tested underconstant axial load and reversed cyclic lateral load that simulatedforces from an earthquake. Each specimen consisted of a columncast integrally with a 510 x 760 x 810 mm stub that represented abeam-column joint area or a footing. The test specimens weredivided into three groups. The first group consisted of four columnsthat were conventionally reinforced with longitudinal and spiralsteel reinforcement. The second group contained six reinforcedconcrete columns that were strengthened with carbon fiber-reinforcedpolymers (CFRP) or glass fiber-reinforced polymers(GFRP)before testing. The…
Constitutive behaviour of confined fibre reinforced concrete under axial compression
Constitutive behaviour of confined fibre reinforced concrete under axial compressionAbstractSteel fibre reinforced concrete is finding extensive use in field applications. The mechanism of delaying and arresting crackpropagation by the fibres can be made use in passive confinement of concrete. Such concrete was termed as confined fiber reinforcedconcrete (CFRC). This paper presents an analytical model for predicting the stress–strain behaviour of CFRC based on the experimentalresults. A total of ninety prisms of size 150 ۱۵۰ ۳۰۰ mm were cast and tested under strain control rate of loading. Theincrease in strength and strain of CFRC were used in formulating the constitutive relation. ۲۰۰۲ Elsevier Science Ltd. All rights reserved….
Flowability of fibre-reinforced concrete and its effect on the mechanical properties of the material
Flowability of fibre-reinforced concrete and its effect on the mechanicalproperties of the materialAbstract
Fibre distribution is an important factor, affecting both the fresh- and hardened-state properties of concrete.The paper describes a study in which the fibre distribution and orientation were investigated bymeans of a suitable technique, by using a translucent fluid model with a yield stress (Carbopol 940).The observation confirmed the ability of the developed method to provide data on the orientation anddistribution of steel fibres within concrete. It was showed that orientation and distribution are dependenton the yield stress of the fluid material. Concrete specimens, containing 0.5% of 35 mm long hooked steelfibres, were also cast and tested under four-point loading,…
Properties and Applications of Fiber Reinforced Concrete
Properties and Applications of Fiber Reinforced ConcreteABSTRACT. Fiber reinforced concrete (FRC) is a new structural materialwhich is gaining increasing importance. Addition of fiber reinforcement indiscrete form improves many engineering properties of concrete.Currently, very little research work is being conducted within the Kingdom using this new material. This paper describes the different types of fibers and the application of FRC in different areas. It also presents the resultof research about the mechanical properties of FRC using straight as well ashooked steel fibers available in the region,…
RILEM Technical Committee 195-DTD Recommendation for Test Methods for AD and TD of Early Age Concrete: Round Robin Documentation Report: Program, Test
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- 15th ژانویه 2018
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RILEM Technical Committee 195-DTD Recommendation for Test Methods for AD and TD of Early Age Concrete: Round Robin Documentation Report: Program, Test
Øyvind Bjøntegaard, Tor Arne Martius-Hammer, Matias Krauss, Harald Budelmann (auth.)…
On Shear Behavior of Structural Elements Made of Steel Fiber Reinforced Concrete
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On Shear Behavior of Structural Elements Made of Steel Fiber Reinforced Concrete
Estefanía Cuenca (auth.)…
Performance-based specifications and control of concrete durability : state-of-the-art report RILEM TC 230-PSC
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- 15th ژانویه 2018
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Performance-based specifications and control of concrete durability : state-of-the-art report RILEM TC 230-PSC
Beushausen, Hans; Fernández Luco, L…