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Optimisation and fatigue behaviour of interface wood-UHPFRC for new composite bridges

Hoai Son Pham
Abstract : This research, deals with the valorisation of wood in bridges The concept selected is a composite wood-UHPFRC (Ultra High Performance Fiber Reinforced Concrete) structure. This type of design has structural properties which are theoretically not reached by the use alone of wood or concrete. Here, the con crete is used in compression and wood primarily in tension. The high resistance of UHPFRC associated with the performance of wood in tension makes it possible to hope designing lightweight structures, easy to build, and using a minimum of non-renewable materia1. However, in this solution, the connection of two materials is always a great concern, in particular under the actions of fatigue. The increase of resistance and rigidity depends on the behaviour of the interface. This thesis presents theoretical and experimental studies on the contribution of connection systems to the behaviour of new wood-UHPFRC composite bridges. After the chapter devoted to bibliographical synthesis, a model, deduced from the Multi-particulate of Multi-layer Materials Models (M4), is developed. The analytical resolution in the case of a composite beam has been carried out and validated by fini te elements calculation. The model accounts for shearing deformation in the layers and slip at the interface. ln the experimental part, the exploratory tests on composite beams, with various fastener systems, covering aIl the categories, are presented. The results have showed that glued assembly of the two materials leads to the best shear stiffness, and ofFers the ultimate highest strength. A prototype of a wood-UHFRC composite deck on scale 1/3 has been designed and four specimens have been carried out. The tests have showed good behavior in fatigue. The encouraging results have thus opened prospects for new composite bridges
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Submitted on : Thursday, May 15, 2008 - 8:00:00 AM
Last modification on : Thursday, May 15, 2008 - 8:00:00 AM
Long-term archiving on: : Friday, September 10, 2010 - 12:30:45 PM

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Hoai Son Pham. Optimisation and fatigue behaviour of interface wood-UHPFRC for new composite bridges. Engineering Sciences [physics]. Ecole des Ponts ParisTech, 2007. English. ⟨pastel-00003725⟩

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