Performance

T-headed Bars

Performance
HRC 100 & 200 Series

For the designer

Concentrated anchorage of the actual (real) tensile strength of the rebar — in the T-head.
The full ductility of the rebar is developed —the very basis for a robust structure.
Reduces congestion by avoiding anchorage bends and hooks
Possible to use fewer larger bars
Excellent confinement effect
Very slim heads (thickness of head plate) allow high flexibility in the design
Can easily be combined with any other HRC Product series at the other rebar end

On the construction site

Straight bars are safer to handle than bend bars
Fast installation of headed bars!
Design with fewer bars and no anchoring bends reduces congestion and leads to improved casting conditions
Improved accessability

Easier, faster & safer work

Concentrated anchorage of the actual (real) tensile strength of the rebar — in the T-head. The full ductility of the rebar is maintained — the very basis for a robust structure.

100% anchorage at the head allows for the shortest possible anchorage length

The concentrated and stiff anchorage properties of headed bars are not dependent on a bond length to develop the full tensile strength of the reinforcement in concrete; 100 % anchorage at the head.

Stiff anchorage

Tests have shown that T-headed bars have improved performance compared to traditional stirrups.

Stiffer
Less deformation/slip between each cycle load

The stiff behavior of the T-head anchorage improves the effectivity of the anchored bar. The T-headed bar gets “active” almost immediately after loading, while a bend bar loses much of its effect to deformation of the concrete under the bend. The load-deformation behavior of a bend bar includes a certain concrete crushing.

The stiff anchorage of T-headed bars is taken advantage of by use as confining – and shear reinforcement. Provided sufficient anchorage capacity for existing loads, the effect of headed reinforcement is superior to bend bars.

The ease of installation and no limitation by bending radii are additional benefits of T-headed bars.

Improved robustness at overload and accidental conditions

Pictures of situation after test of CIDH pile Supported Footings (University of California, San Diego).

Conventional stirrups bend-up and pushing out the concrete

Model of test: Left conventional stirrups bend-up and pushing out the concrete and T-headed transverse reinforcement to the right.

T-headed transverse reinforcement

Reduced Congestion with T-headed bars

Use of T-headed reinforcement allows often for a significant reduction in numbers of bar to place. Additionally are headed bars generally faster to place compared to bend bars and stirrups.

Shear reinforcement — avoid installation errors and problems with field tolerances

A typical situation in the field: the stirrup bend is not directly enclosing the longitudinal bar.

HRC / Skisse skjærarmering stirrup Vs TH

Stirrups: Field tolerances reduce anchoring capacity further
T-Headed Bars: always full anchorage

Insufficient anchorage at the bottom end.

T-headed bar: always fully anchored at both ends.