Publications

Finite Element Analysis of a Precast Fibre Reinforced Concrete Track Slab

Károly Péter Juhász1 and Péter Schaul2
1. Department of Mechanics, Materials & Structures, Budapest University of Technology, Budapest 1111, Hungary
2. Department of Construction Materials and Technologies, Budapest University of Technology, Budapest 1111, Hungary

Abstract: In this article a macro synthetic fibre reinforced precast concrete track slab’s design process will be presented. The analysis was done with using advanced finite element software called ATENA (Cervenka et al. 2013). Beside the static loads, the precast slab was also checked for dynamic and fatigue loads. The structure was verified for early ages, for de-moulding, rotating, lifting and for transport as well. With the analysis a necessary fibre dosage was determined. After the design AECOM prepared a real scale test for two full slabs. During the test the displacements were measured on different places with using geophones. Finite element model of the test was made with all the details of the real scale test. The results from the tests and from the finite element models were close to each other in every checked case.

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NUMERICAL MODELLING OF A PRECAST FIBRE REINFORCED CONCRETE TRACK SLAB

Károly Péter Juhász, JKP Static Ltd.,Reitter Ferenc str. 73, Budapest, Hungary
Péter Schaul,JKP Static Ltd.,Reitter Ferenc str. 73, Budapest, Hungary
John Hammond,Precast Advanced Track Ltd.,King Street, Knutsford, United Kingdom

SUMMARY: In this article a macro synthetic fibre reinforced precast concrete trackslab’s design process will be presented. The analysis was done with using an advanced finite element software called ATENA (Cervenka et al 2013). Beside the static loads, the precast slab was also checked for dynamic and fatigue loads. The structure was verify for early ages, for demoulding, rotating, lifting and for transport as well. With the analysis a necessary fibre dosage was determined. After the design AECOM prepared a real scale test for two full slab. During the test the displacements were measured on different places with using Geophones. Finite element model of the test was made with all the details of the real scale test. The results from the tests and from the finite element models were close to each other in every checked case.

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OPTIMISATION OF TBM TUNNEL IN THE SHANGHAI METRO EXTENSION USING MACRO SYNTHETIC FIBRE

Károly Péter Juhász, Budapest University of Technology and Economics, Department of Mechanics, Materials & Structures
Műegyetem rakpart 1-3, Budapest, Hungary, Péter Schaul, JKP Static Ltd.
Reitter Ferenc 73, Budapest, Hungary, Lóránt Nagy, JKP Static Ltd.
Reitter Ferenc 73, Budapest, Hungary

SUMMARY: Shanghai metro extension is one of the most enormous TBM tunnel investigation nowadays in Republic of China. Because of the size of the investment several research connected to the project. The Customers tried to use the most economic concrete reinforcement, and joint element between the rings. The Tongji University made a real scale test about the full precast concrete tunnel ring. The test was verified with numerical models. After the clarification of the material parameters, finite element analysis was done to optimize the steel bar reinforcement in the ring, and replace it with synthetic fibres. To find the optimum joint formation different models were carried out. The effect of the different bolt types (curved or straight) was significant, just like the use of fibres. With the optimum solution the structure will be more ductile than with the original formation.

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FIBRE REINFORCED CONCRETE CONSTITUTIVE LAWS FOR NUMERICAL SIMULATION 

Tereza Sajdlová1, Radomír Pukl1 , Karoly Peter Juhasz2, Lorant Nagy2, Peter Schaul2
1 Cervenka Consulting Na Hřebenkách 55, Prague, Czech Republic 2 JKP Static Ltd. Reitter Ferenc Street 73, Budapest, Hungary

SUMMARY: Determination of appropriate material parameters for the fibre reinforced concrete material model in design and assessment of structures is an important task, which is necessary for realistic modelling of FRC structures. Various recommendations and definitions are specified by specialized groups as RILEM, fib or ACI. These recommendations deal with test results of beam submitted to three or four point bending load with or without notch. Authors compared these documents and applied the determined parameters in numerical simulations. As the achieved results were not very satisfactory, a new solution for definition of the FRC parameters should be found. Presented solutions involve inverse analysis of results and method proposed by Juhasz (Juhasz, 2013). This methodology applies so-called modified fracture energy: the fracture energy of concrete is extended by energy contribution related to fibres.

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NUMERICAL MODELLING OF A PRECAST FIBRE REINFORCED CONCRETE TRACK SLAB

Károly Péter Juhász, JKP Static Ltd., Reitter Ferenc str. 73, Budapest, Hungary
Péter Schaul, JKP Static Ltd., Reitter Ferenc str. 73, Budapest, Hungary
John Hammond, Precast Advanced Track Ltd., King Street, Knutsford, United Kingdom

SUMMARY: In this article a macro synthetic fibre reinforced precast concrete trackslab’s design process will be presented. The analysis was done with using an advanced finite element software called ATENA (Cervenka et al 2013). Beside the static loads, the precast slab was also checked for dynamic and fatigue loads. The structure was verify for early ages, for demoulding, rotating, lifting and for transport as well. With the analysis a necessary fibre dosage was determined. After the design AECOM prepared a real scale test for two full slab. During the test the displacements were measured on different places with using Geophones. Finite element model of the test was made with all the details of the real scale test. The results from the tests and from the finite element models were close to each other in every checked case.

Download


OPTIMISATION OF TBM TUNNEL IN THE SHANGHAI METRO EXTENSION USING MACRO SYNTHETIC FIBRE

Károly Péter Juhász, Budapest University of Technology and Economics, Department of Mechanics, Materials & Structures, Műegyetem rakpart 1-3, Budapest, Hungary,
Péter Schaul, JKP Static Ltd., Reitter Ferenc 73, Budapest, Hungary
Lóránt Nagy, JKP Static Ltd., Reitter Ferenc 73, Budapest, Hungary

SUMMARY: Shanghai metro extension is one of the most enormous TBM tunnel investigation nowadays in Republic of China. Because of the size of the investment several research connected to the project. The Customers tried to use the most economic concrete reinforcement, and joint element between the rings. The Tongji University made a real scale test about the full precast concrete tunnel ring. The test was verified with numerical models. After the clarification of the material parameters, finite element analysis was done to optimize the steel bar reinforcement in the ring, and replace it with synthetic fibres. To find the optimum joint formation different models were carried out. The effect of the different bolt types (curved or straight) was significant, just like the use of fibres. With the optimum solution the structure will be more ductile than with the original formation.

Download