Ductility analysis on the post-peak behavior of self-compacting fiber reinforced concrete (SCFRC) beams subjected to shear

Author(s): E. Cuenca, J. Echegaray, P. Serna, A. Pasetto
Paper category: Conference
Book title: 8th RILEM International Symposium on Fiber Reinforced Concrete: challenges and opportunities (BEFIB 2012)
Editor(s): Joaquim A.O. Barros
Print ISBN: 978-2-35158-132-2
e-ISBN: 978-2-35158-133-9
Publisher: RILEM Publications SARL
Pages: 1370 - 1382
Total Pages: 12
Language: English

Abstract: 
Summary: It is well known that steel fibers have an efficient effect on the shear behavior, enhancing its ultimate load and guarantying the minimum shear reinforcement required by the current Codes. Steel fibers make possible a more distributed cracking pattern, where shear cracks have smaller crack widths and less separated one to each other. To analyze the fiber contribution to shear capacity, Codes usually consider only the residual concrete strength at a 2.5 mm crack opening in the flexural test (fR3) but, it is possible to reach a similar fR3 testing concretes with very different post-cracking behavior.

In this paper, shear behavior on self-compacting fiber reinforced concrete (SCFRC) beams is analyzed, paying attention to the serviceability limit state (SLS), the ultimate limit state (ULS), and also analyzing the ductility on the load / deflection and load / shear crack opening behavior of these beams. To achieve the objectives, an experimental program consisting of SCFRC double-T beams was designed. Beams were 2400mm long, with a double-T cross-section 350mm height and web width equal to 90mm.

The main parameters of study were: concrete compressive strength level (30, 50, 80MPa) and steel fibers quality (using fibers with different strength levels, lengths, and aspect ratio (length/diameter)).
The amount of steel fibers (50kg/m3) was kept constant. Beams without fibers were produced to be utilized as a reference.
Studying all the parameters, the post-peak behavior analysis under shear loadings has been possible.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00