Title:
Failure Mechanism and Debonding Analysis of Steel and Steel Fiber-Reinforced Concrete Composite Beams
Author(s):
Kai Wu, Shiqi Lin, Jianyang Xue, Chao Xu, and Xiaoyi Liu
Publication:
Structural Journal
Volume:
118
Issue:
5
Appears on pages(s):
189-204
Keywords:
debonding analysis; failure mechanism; four-point bending test; load-deflection curve; steel and steel fiber-reinforced concrete
DOI:
10.14359/51732828
Date:
9/1/2021
Abstract:
With the purpose of solving construction difficulties in composite
steel-reinforced concrete (CSRC) structures, the reinforcing bar
cage is replaced with steel fiber to form a steel and steel fiber-reinforced concrete (SSFRC) composite structure. By conducting
a four-point bending test on 18 specimens, the failure mechanism
of SSFRC composite beams without reinforcing bar cages was
studied, and load-deflection curves were obtained. The impact of
the ratio of steel fiber, the ratio of H-shape steel, and the shear
span ratio on failure mode and bonding behavior was analyzed.
The bridging effect of the steel fibers can effectively enhance the
tensile capacity of concrete after cracking, and debonding failure
can be delayed or even avoided. For specimens with a small shear
span ratio λ, it can be deemed that the limit of steel fiber ratio
ρsf for shearing failure and bending failure was approximately
between 1 and 2%. For specimens with a large λ, it was found that
the ρsf affected both the debonding failure and the bending failure.
The larger the λ, the more steel fibers are needed to transform the
failure mode from debonding failure to bending failure. Using
the combination of H-shape steel and steel fiber, the damage on
SSFRC composite beams can be effectively controlled so that better
mechanical behavior can be achieved.
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