a PhD thesis at the College of Engineering at the University of Basrah discussing (torsion in high-strength concrete beams reinforced with fibers)
The study presented by the student Jawad Kadhem Moris dealt with two main phases:
The first stage: It included ten hollow bridges made of ordinary concrete, with a strength of 30 MPa, one was a molded control bridge without steel fibres, the other was reinforced concrete bridges
With two kinds of steel fibers and three ways (corrugated fiber only, bent end fiber only, both of which are in proportion
50% each). Three different proportions of steel fibers have been added
 In the second phase of this study, it will be
Use of alloyed steel fibers (1.5%) With high strength concrete.
The second stage: fifteen hollow concrete bridges poured with 60 megabytes of high-strength concrete
Pascal and steel-fibre mixture reinforced, with cavities of various shapes and sizes, tested under load
Pure torsion. The bridges were divided into four groups: (1) Three square-bore bridges were cast and reinforced with different proportions of steel fibres. (2) Three square-bore bridges of different dimensions are reinforced with a ratio of
1.5% of mixed steel fibres. (3) Three hollow circular bridges of different diameters
(4) Three square-bore bridges are pattern-reinforced and reinforced with 1.5% steel fiber mixed once, and again without it.
Theoretically, ANSYS 18.2 finite element technology is used to represent and analyze all
bridges.
This thesis aims to investigate the torsional behavior of hollow steel reinforced concrete bridges. like that
To determine the type and quantity of steel fibers that will provide optimum torsional resistance under pure torsional load with
Maintain operability, prevent separation of concrete components and avoid implementation problems
The thesis concluded that crimped steel fibers end up with greater resistance to torsion than corrugated steel fibers, while mixed steel fibers provide relatively stronger torsional strength than corrugated steel fibers.
the other two types. For the same section dimensions and concrete properties.