Load Bearing Behavior of UHPFRC Beams Reinforced with High Grade Steel

• Published in: Key engineering materials 2014-10, Vol.629-630, p.551-559
• Main Authors: Mészöly, Tamás, Randl, Norbert
• Format: Article
• Language: English
• Subjects: Cracks; Cross sections; Ductility; Failure; I beams; Reinforcement; Shear; Strain hardening; Tensile tests
• ISSN: 1013-9826; 1662-9795; 1662-9795
• DOI: 10.4028/www.scientific.net/KEM.629-630.551

In the frame of a research project funded by the Austrian Research Foundation (FFG) a series of 10 UHPC beams with an I-shaped cross-section and a full length of 3.5 m was produced and subjected to four-point bending and shear loading respectively until failure. The amount of longitudinal reinforcement as well as the fiber content was varied. The tensile strength of the longitudinal reinforcement was 800 to 1100 MPa. Several circular shaped openings were foreseen in order to facilitate potential installation crossings. The cross-section was optimized for load bearing capacity and ductility. Special attention was paid on the crack development and SLS criteria as well as the ductility after reaching ultimate load level. The full constitutive law of the applied UHPFRC mixture was derived from compression tests, uniaxial tension tests and several small scale four-point bending tests. On the basis of the derived constitutive law in tension, the UHPFRC was classified as “type 2 – low strain hardening” fiber reinforced concrete.