Conception de dalles de ponts avec armature reduite et beton de fibres d'acier

The main purpose of this project is to use steel fibre reinforced concrete in the construction of bridge decks, in order to increase durability while at the same time ensuring the necessary structural strength. A reduction in the amount of conventional reinforcement would reduce corrosion problems, while the addition of steel fibres would control cracks and would also increase the flexural strength. This thesis sets the basis to design steel fibre reinforced concrete bridge decks with reduced amount of conventional reinforcement steel.;To ensure the feasibility of casting high performance concrete with large amounts of fibres (80 kg/m3), two bridge decks have been built with success: the deck of Cascades bridge located in St. Jerome and a portion of the deck of the bridge located on road 138 in Maskinonge.;Static and fatigue bending tests have been completed on high performance concrete slab specimens with steel fibres (HPCSF) and on high performance concrete without fibres (HPC). These specimens were provided with different reinforcement patterns.;In addition, test methods were completed to evaluate the post-cracking tensile behaviour of HPCSF: RILEM bending test and uniaxial tensile test. (Abstract shortened by UMI.).