A simple design approach for UHPFRC in bending

Author(s): T. Leutbecher, E. Fehling
Paper category: Symposium
Book title: RILEM-fib-AFGC International Symposium on Ultra-High Performance Fibre-Reinforced Concrete
Editor(s): F. Toutlemonde, J. Resplendino
Print ISBN: 978-2-35158-130-8
e-ISBN: 978-2-35158-131-5
Publisher: RILEM Publications S.A.R.L
Pages: 509 – 518
Total Pages: 10
Language: English

For economic design and construction of long-span structures made of UHPFRC as well as for the exploitation of the ultra high compressive strength in bending members in general, traditional reinforcement (rebar, prestressing) is needed in addition to the fibres. For the design of UHPFRC cross-sections with combined reinforcement subject to bending with/without axial force, the well-known assumptions and equilibrium conditions for designing reinforced and prestressed concrete have to be extended in order to consider the contribution of fibres.
For this purpose, a simplified design approach is discussed in this paper. After presenting material models suitable for cross-sectional design of UHPFRC, a well-founded engineering model is derived that is, in addition, easy to handle. For validation, the predictions of the model are compared with results from 4-point bending tests on UHPFRC beams with passive reinforcement.

Online publication: 2014
Publication Type: full_text
Public price (Euros): 0.00

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