Shear behaviour of synthetic fibre reinforced concrete beams reinforced with FRP rebars

FRP rebar has become considered more and more as an ordinary reinforcement in concrete structures, due to its main advantage of being corrosion-free. However, FRP bars can be bent only at the manufacturing stage and not on site, which makes the production of items such as stirrups difficult and uneconomical. As an alternative, shear reinforcement bars could be replaced by fibre reinforcement. In order to maintain the non-corrosive nature of the composite material synthetic fibre should be used in this case. In this paper beam tests were carried out to research the shear behaviour of these fully non-corrosive reinforced concrete beams.

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Evaluation of steel fiber reinforced concrete beam test results based on the real fiber distribution

The standard test methods of FRC (Fiber Reinforced Concrete) are bending beam tests. Due to the random distribution of the fibers there could be a big dispersion in the results. This large dispersion could be decreased by increasing the number of specimens and/or the area of the representative cross section. In this article the possibility of decreasing the dispersion is researched with a method based on the real fiber distribution.

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Evaluation of fibre reinforced concrete beam test results based on the examination of the real fibre distribution

The standard test methods of FRC (Fibre Reinforced Concrete) are bending beam tests. Due to the random distribution of the fibres there could be a big dispersion in the results. This large dispersion could be decreased by increasing the number of specimens and/ or the area of the representative cross section. In this article the possibility of decreasing the dispersion is researched with a method based on the real fibre distribution.

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Modelling Of The Early Age Shrinkage Cracks With Steel Or Synthetic Macro Fibre Reinforcement In Jointless Floors

The use of fibre reinforcement has become a popular alternative to traditional steel mesh in industrial floors for the control of early age shrinkage. However, there are no generally accepted standards for the design of the jointless floors, only guidelines. One of the most well-known guidelines for industrial floors is the British guideline: TR 34 – Concrete Industrial Ground Floors.

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The Beginning: The Tramway in Szeged

In 2010 and 2011, during the extension and reconstruction process of the A and C sections of tram line Nr.I. in Szeged and the construction of the tram line No.II., we had to solve a typical problem: in the areas of the so-called loops, providing tramway priority, the concrete slabs coud not contain reinforcement. Therefore, we came up with the idea of using synthetic fibre-reinforced concrete in these sections.

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Full-round numerical analysis of traditional steel bar and macro synthetic fibre reinforced concrete segments for the Shanghai Metro Extension (2015)

A full scale TBM segmental tunnel ring was modelled with an advanced material model in FEA. By using the modified fracture energy method an accurate material model can be used for FRC. A typical Shanghai Metro extension TBM tunnel segmental ring was tested to full scale at the Tongji University, Shanghai, and the load-displacements results were compared with the FEA. The similarity was deemed appropriate, so the model has been justified. Low-stressed steel bars within the section were reduced and macro synthetic fibre was added to the structure. By using macro synthetic fibre reinforcement the volume of steel bars could be reduced. This, in return, leads to significant cost savings in both material and labour, as well as a reduction of the production cycle times.

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Full-round numerical Modelling of a Macro Synthetic Fibre reinforced tunnel Boring Machine tunnel in the Shanghai Metro Extension (2014)

The authors were engaged to optimise a traditional rebar cage reinforced concrete segmental lining by means of finite element analysis (FEA) using macro synthetic fibres for the Shanghai metro extension. The aim of this study was to reduce or entirely replace the original steel reinforcement of the segmental lining, in order to make the precast production process faster and more economic. The outer diameter of the tunnel was 6200 mm, the thickness of the segments was 350 mm.

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Synthetic and Steel Fibres in Prestressed, Precast Long Span Beams (2014)

Four large-scale, prismatic, T-shaped beams with 19 m span were produced without stirrups, but 2 with synthetic fibres and 2 with steel fibres. Four point bending tests were made to simulate the load bearing process of built-in beams. Three point shear tests were made in the uncracked ends of the beams to prove the shear resistance of FRC. Thebehaviour of beams made of synthetic and steel fibre reinforced concrete was compared. Finite element calculation was made with the fibre reinforced concrete and plain concrete as well. The material model was according to Eurocode and the effect of the fibre was according to RILEM guideline. The numerical and real test load-deflection results showed close correlation.

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Research on concrete beams reinforced by micro and macro synthetic fibres (2014)

The synthetic fibre reinforcement for concrete mainly refers to micro fibre in Hungary for engineers, contractors, even for concrete technologists; however, there are also macro fibres and the difference between them is very significant. While synthetic micro fibres have practically no static effect on the cracked structure, the macro fibres act similarly to the steel fibres.

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Precast, prestressed grandstand of PFRC in stadium, Hungary (2013)

A stadium with 20.020 people capacity will be built in Debrecen, Hungary. The slab part of the precast, multi-stairs grandstand is only 12 cm thin and prestressed; PFRC is used instead of mild stirrups. Six types of polymer fibres were tested and compared according to RILEM regulations with the same dosage.

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Modified Fracture Energy Method For Fibre Reinforced Concrete (2013)

Fibre manufacturers specify different parameters for measuring the performance of their fibres, e.g. Re3 number or sigma-epsilon diagram. However, these parameters depend largely on the strength class of the concrete; most specifically on the fracture energy, which is in itself a variable from cement manufacturer to manufacturer, even within the same class. The ideal would be to find a performance parameter that is fibre specific and at least partially independent of the concrete, which could then be used for characterizing and comparing the various fibre types. In this paper I present a fibre added energy that could be used to characterize the fibres in this way.

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The Analysis and Calculation of Synthetic Fibre’s Application in Tunnel Lining (2013)

This article describes the various Barchip reinforced concrete test results, as well as synthetic fibersí other engineering application examples. The design in this paper is based on a typical Shanghai geological condition. According to the results of real beam test from EPC and design guide (RILEM TC 162-TDF), a model of Barchip reinforced concrete was built in the Software ATENA. The model of ground and the tunnel lining was simulated in the Software. The results showed that the tensile and compressive stress and crack control etc. meet the engineering requirements. Barchip synthetic fibers can be used in the construction of the Shanghai subway tunnel lining.

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Determination Of The Flexural Tensile Strength Of Concrete And Fibre Reinforced Concrete For Nonlinear Calculations (2013)

The determination of concrete and reinforced concrete flexural tensile strength of the current guidelines are based on the ultimate strength. This result is suitable for linear calculations, but consid-ering the fracture energy, the numerically calculat-ed peak load will be bigger. I present in my article some material models that are appropriate for nonlinear calculations.

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Current State Of The Art Usage Of Structural Synthetic Fibres As A Replacement For Steel Mesh And Steel Fibres In Sprayed Primary Linings, Final Linings, Cast In Situ Linings And In Precast Segmental Linings (2012)

The purpose of this paper is to bring to the attention of the audience the numerous cases around the world that have substituted steel mesh and steel fibres for structural synthetic fibres as their reinforcement option in different types of tunnels.

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EPC szálerősített villamos pályák (2015)

A villamospályák méretezésekor fontos tudni, illetve meghatározni a villamos pálya használati élettartamát. Tapasztalatok szerint javasoljuk a 35 és élettartam alkalmazását a fő szerkezetekre…

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Az első magyar, műanyag szállal erősített és füvesített villamospálya (2015)

Magyarország nagyvárosaiban az elmúlt 6-7 évben megújúltak a városi villamosvonalak. Az uniós fejlesztések a mobilitást, a környezetvédelmet és az utazási komfort növekedését, továbbá a személygépjármű-forgalom csökkentését irányozták elő.

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Betontechnologia diploma: Szintetikus makro szalerositesu betonok (2014)

Szintetikus makro es mikro szalerositesek osszehasonlitas. Makro: BarChip48, Forta Ferro, Propex Enduro HPP, Kapoplast, Mapei ST48, Mapei ST24. Mikro: Brug Contect High Grade, Forta Net, Forta Econo Mono. Szintetikus szalerositesu betonok viselkedese betontechnologiai szempontbol. Hazai es nemzetkozi peldak.

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Szintetikus mikro es makro szalerositesu betonok kozotti kulonbsegek (2013)

Hazankban is egyre elfogadottabba valik a szintetikus szalerositesu betonok alkalmazasa, habar a szintetikus mikro es makro szalak kozotti alapveto kulonbsegeket gyakran meg a szakemberek sem ismerik. A kulonbseg azonban jelentos, mind a meretezes, mind a felhasznalas tekinteteben. Ebben a cikkben ezeket a fobb kulonbsegeket vesszuk sorra: szabvanyok allaspontja, hazai kutatasi eredmenyek, meretezes, felhasznalasi lehetosegek.

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