Journal
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
Volume 159, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijimpeng.2021.104039
Keywords
High strength fiber reinforced concrete; Impact; Flexure; Numerical model
Categories
Funding
- National Agency for Scientific and Technological Promotion [PICT 2017 1313]
- National Scientific and Technological Research Council (CONICET)
- LEMIT-CIC
- National University of Tucuman Research Council [PIUNT E623]
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In the impact load testing of fiber reinforced concrete beams, the fiber content had little effect on the behavior before matrix cracking, but showed some differences in both static and dynamic responses.
High strength fiber reinforced concrete beams with different contents of steel hooked end fibers (without fibers, with 40 and 80 kg/m(3)) were tested under impact loads using a Drop - Weight Impact device with different projectile impact velocities. Numerical modeling was additionally carried out with Karagozian and Case constitutive model for concrete that was calibrated to include the effect of the fibers in the post-peak response of fiber reinforced concrete. Before matrix cracking the behavior was almost independent on fiber content and the first crack appeared for the same impact velocity corresponding to a maximum impact load that was approximately 10 times the static cracking load. For the same impact velocity, maximum impact load was slightly higher for beams with higher fiber content that presented evident smaller cracks and deflections. The benefit of doubling the fiber content from 40 to 80kg/m(3) on the dynamic structural performance was similar to that obtained in the static flexure response, while, at material level, it was lower.
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