A numerical model to determine the characteristic length of UHPFRC beams

Author(s) : P. Hadl, N.-V. Tue
Paper category : Proceedings
Book title : UHPFRC 2017 Designing and Building with UHPFRC: New large-scale implementations, recent technical advances, experience and standards
Editor(s) : F. Toutlemonde & J. ResplendinoT.Ch.
Print-ISBN : 978-2-35158-166-7
e-ISBN : 978-2-35158-167-4
Publisher : RILEM Publications SARL
Publication year : 2017
Pages: 325 - 336
Total Pages : 12
Language : English

Abstract: This paper presents a numerical approach to determine the characteristic length of UHPFRC beams. In principle, the model calculates force or flexural-tensile stress – mid-span deflection relationships of 4-point-bending tests. Since each fibre is considered separately in the model, the position to the crack as well as the embedded length and angle are known for each fibre. By iterative calculation of the compression zone height, the cross-sectional load bearing capacity can be determined depending on the given strain plane or crack width. The deflection is calculated with the principle of virtual work by double integration of the curvatures over the length of the prism. Consequently, the characteristic length is determined for each bending beam by comparison with experimental results. By this mean, associated stress-strain relationships are derived from bending tests. In addition, the influence of scattering in the fibre distribution and orientation on the load bearing behaviour has been investigated.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00