Shear resistance of ultra high performance fibre-reinforced concrete I-beams

FraMCoS, JEJU, COREE, REPUBLIQUE DE, 23-/05/2010 - 28/05/2010Ultra High Performance Fibre-Reinforced Concrete (UHPFRC) refers to materials with a cement matrix and a characteristic compressive strength in excess of 150 MPa, and containing steel fibres in order to achieve ductile behaviour under tension. Thanks to these outstanding properties thin and durable structural elements can be made. Shear verifications of structures made of UHPFRC are thus often critical. The possibility to add the stirrups force at yielding and the post-cracking fibres contribution in the theoretical estimate of the ultime shear resistance requires appropriate verification. In order to quantify the safety margin of shear design provisions, an experimental campaign has been carried out at the LCPC (French Public Works Research Institute). In a Four-Point Bending configuration, shear tests have been conducted on nine 3m-long I-shaped girders with varied types of shear reinforcement (stirrups, fibers and both) combined with longitudinal prestressing or passive reinforcement

20-Years Field Durability Experience of oldest UHPFRC Structural Elements

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