Title:
Experimental investigation of shear-critical prestressed steel fibre reinforced concrete beams
Author(s):
De Smedt, M.; De Wilder, K.; Anastasopoulos, D.; Reynders, E. ; De Roeck, G.; Vandewalle, L.
Publication:
Symposium Paper
Volume:
343
Issue:
Appears on pages(s):
121-131
Keywords:
Shear, prestressed steel fibre reinforced concrete, experimental mechanics, analytical models, advanced optical measurement techniques
DOI:
Date:
10/1/2020
Abstract:
This paper presents the experimental results of prestressed steel fibre reinforced concrete
(SFRC) beams and it compares analytical model predictions with these results. Six beams
were subjected to a force-controlled four-point bending test until failure. The three
investigated parameters were the fibre dosage, the amount of prestressing force and the
presence of shear reinforcement. During the test, failure mode and load, as well as
deformations, displacements and cracking pattern properties were observed by means of
conventional measurement devices and advanced optical techniques, including Bragg grated
optical fibres and digital image correlation technique. Additionally, material properties were
determined according to standardized European tests. The experimental results were
compared to analytical predictions according to shear design equations in Model Code 2010.
For the six beams, an average experimental-to-predicted failure load ratio of 1.43 was found
with a coefficient of variation of 7.2%. Furthermore, four other analytical models for shear
design of SFRC are investigated, namely DRAMIX Guideline, RILEM TC 162-TDF sigmaepsilon
method, CNR-DT 204/2006 model and a model proposed by Soetens. All models
underestimate the shear capacity of prestressed SFRC beams. The underestimation increases
for a higher prestress level, whereas the correlation with the fibre dosage varies within the
models.