Ultra High Performance Fibre-Reinforced Concrete (UHPFRC) refers to materials with a ce- ment matrix and a characteristic compressive strength in excess of 150 MPa, and containing steel fibres in or- der to achieve ductile behaviour under tension. Thanks to these…
Ultra High Performance Fibre-Reinforced Concrete (UHPFRC) refers to materials with a ce- ment matrix and a characteristic compressive strength in excess of 150 MPa, and containing steel fibres in or- der to achieve ductile behaviour under tension. Thanks to these outstanding properties thin and durable struc- tural 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 es- timate 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 longitudi- nal prestressing or passive reinforcement.