Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Time-dependent behaviour of a self-compacting VHPC in prebent composite beams for innovative railway bridges in France
An extensive experimental research has been carried out in the framework of the French National Project MIKTI in order to extend the Belgian technique of steel-concrete prebended beams to Very High Performance Concrete (VHPC: self-compacting C80/95 with silica fume). In comparison to the present realizations coming from Belgium, the main advantage of using VHPC instead of C50 concrete is to decrease the prestressing losses of the system thanks to a significant decrease of the creep deformations, together with the possibility to optimize the beam weight and its serviceability domain. As one research step was the casting of concrete around the bottom flange of two 13 m-span steel girders, it was necessary to use a self-compacting concrete with a suitable maximum aggregate size due to the very dense network of wires, sensors and steel reinforcements. Numerous measurements such as mechanical characterization, Young's modulus, creep and shrinkage tests in standard (20 deg C, 50 % RH) and variable (same as within the beams) ambient conditions were performed, so that a correct analysis of the structural behavior of the beams could be done. Detailed results of the global response of the two beams as well as the validation of the scientific method for taking concrete creep into account is analyzed in conjunction with local strain and deflection measurements.
Time-dependent behaviour of a self-compacting VHPC in prebent composite beams for innovative railway bridges in France
An extensive experimental research has been carried out in the framework of the French National Project MIKTI in order to extend the Belgian technique of steel-concrete prebended beams to Very High Performance Concrete (VHPC: self-compacting C80/95 with silica fume). In comparison to the present realizations coming from Belgium, the main advantage of using VHPC instead of C50 concrete is to decrease the prestressing losses of the system thanks to a significant decrease of the creep deformations, together with the possibility to optimize the beam weight and its serviceability domain. As one research step was the casting of concrete around the bottom flange of two 13 m-span steel girders, it was necessary to use a self-compacting concrete with a suitable maximum aggregate size due to the very dense network of wires, sensors and steel reinforcements. Numerous measurements such as mechanical characterization, Young's modulus, creep and shrinkage tests in standard (20 deg C, 50 % RH) and variable (same as within the beams) ambient conditions were performed, so that a correct analysis of the structural behavior of the beams could be done. Detailed results of the global response of the two beams as well as the validation of the scientific method for taking concrete creep into account is analyzed in conjunction with local strain and deflection measurements.
Time-dependent behaviour of a self-compacting VHPC in prebent composite beams for innovative railway bridges in France
Zeitabhängiges Verhalten eines selbstverdichtenden VHPC in vorgebogenen Verbundträgern für innovative Eisenbahnbrücken in Frankreich
Staquet, S. (Autor:in) / Boulay, C. (Autor:in) / Maou, F. Le (Autor:in) / Lauvin, L. (Autor:in) / Renaud, J.C. (Autor:in) / Toutlemonde, F. (Autor:in)
2009
7 Seiten, 10 Bilder, 2 Tabellen, 10 Quellen
Aufsatz (Konferenz)
Englisch
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