Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Behaviour of steel-concrete composite beams made of Ultra High Performance Concrete
Ultra-High Performance Concretes (hereafter, UHPC) have high mechanical strengths and exhibit quasi-strain hardening in tension. Their very density improve durability and extend long service life. The steel-concrete composite beams with concrete slab made of UHPC possess advanced properties give significant improvement in ultimate strength of the composite beams. The research reported in this thesis aimed to determine the performance and structural behaviour of composite steel-UHPC elements in bending. In addition, the continuous Perfobond based shear connectors that belong to the beams was investigated as well. The Experimental assessment of the shear connector was conducted through the series Push-Out test with 27 specimens. In order to predict shear capacity, characteristic load-slip curves as well as contribution of constituents. The connectors without any reinforcement show very poor ductility, the characteristic slip reached lower 1.5 mm only. They could be classified as non-ductile connector. The headed stud show better characteristic load-slip response, but this connector often failed by shanked at the base of connector. The shear connector with added reinforcement in front cover and dowel exhibits better performance than headed stud connection in both terms of load capacity and ductility. The test pointed out that embedded rebars in dowel play an important role in improvement performance of the connector. The contribution of steel fiber less important than and it is not obviously when steel fiber vary in range of 0.5 % to 1.0 %. The structural response of the composite members under bending with the UHPC slab in compression was investigated with four points bending test of six full scale composite beams. The concrete mix contained either 1% fibres or 0.5% (by volume) of straight steel fibres with concrete strength of approximately 150 MPa. The experimental study demonstrates that the use of UHPC slab with continuous shear connector is possible, and it enhances the performance of composite elements in terms of resistance and stiffness. The finite element analysis of the Push-Out specimen and composite beams which tested in this investigation was carried out using software ATENA. Full three dimension models for both Push-Out specimens and composite beams were developed in order to taken into account complexity of geometry. The concrete was modelled using a Microplane M4 with parameters were calibrated accompanying to uni-axial compression and RILEM bending test. Modelling result showed a reasonable agreement with the experimental data. The FE simulation is not only provide ultimate strength, global behaviour but also explained local damage area as well process of collapse occurred in structures. However, the FE analysis need more improvement in concrete material model, in order to used for parameter studies. Finally, based on result of experimental and numerical investigation a numerous recommendations are issued for practical design. The results form this work provide to better knowledge on using new UHPC in composite structures. It also contribute to provision of design code.
Behaviour of steel-concrete composite beams made of Ultra High Performance Concrete
Ultra-High Performance Concretes (hereafter, UHPC) have high mechanical strengths and exhibit quasi-strain hardening in tension. Their very density improve durability and extend long service life. The steel-concrete composite beams with concrete slab made of UHPC possess advanced properties give significant improvement in ultimate strength of the composite beams. The research reported in this thesis aimed to determine the performance and structural behaviour of composite steel-UHPC elements in bending. In addition, the continuous Perfobond based shear connectors that belong to the beams was investigated as well. The Experimental assessment of the shear connector was conducted through the series Push-Out test with 27 specimens. In order to predict shear capacity, characteristic load-slip curves as well as contribution of constituents. The connectors without any reinforcement show very poor ductility, the characteristic slip reached lower 1.5 mm only. They could be classified as non-ductile connector. The headed stud show better characteristic load-slip response, but this connector often failed by shanked at the base of connector. The shear connector with added reinforcement in front cover and dowel exhibits better performance than headed stud connection in both terms of load capacity and ductility. The test pointed out that embedded rebars in dowel play an important role in improvement performance of the connector. The contribution of steel fiber less important than and it is not obviously when steel fiber vary in range of 0.5 % to 1.0 %. The structural response of the composite members under bending with the UHPC slab in compression was investigated with four points bending test of six full scale composite beams. The concrete mix contained either 1% fibres or 0.5% (by volume) of straight steel fibres with concrete strength of approximately 150 MPa. The experimental study demonstrates that the use of UHPC slab with continuous shear connector is possible, and it enhances the performance of composite elements in terms of resistance and stiffness. The finite element analysis of the Push-Out specimen and composite beams which tested in this investigation was carried out using software ATENA. Full three dimension models for both Push-Out specimens and composite beams were developed in order to taken into account complexity of geometry. The concrete was modelled using a Microplane M4 with parameters were calibrated accompanying to uni-axial compression and RILEM bending test. Modelling result showed a reasonable agreement with the experimental data. The FE simulation is not only provide ultimate strength, global behaviour but also explained local damage area as well process of collapse occurred in structures. However, the FE analysis need more improvement in concrete material model, in order to used for parameter studies. Finally, based on result of experimental and numerical investigation a numerous recommendations are issued for practical design. The results form this work provide to better knowledge on using new UHPC in composite structures. It also contribute to provision of design code.
Behaviour of steel-concrete composite beams made of Ultra High Performance Concrete
Vinh, Bui Duc (Autor:in)
2010
213 Seiten, Bilder, Tabellen, 112 Quellen
Hochschulschrift
Englisch
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