T-headed bars

HRC Europe / Products / T-headed bars

T-head rebars

T-head rebars (also known as “headed reinforcing bars”) are reinforcing steel bars for concrete structures, that are equipped with a device for mechanical anchorage in one or both ends. The anchorage device (the “head”) often has the shape of a plate, that makes the end look like the letter “T”. Therefore, the term “T-head rebar” is used.

Headed reinforcing bars are used in the same way as common reinforcing bars, with the “head” providing the anchorage of the bar. This type of anchorage is an alternative to anchorage by rebar bends or hooks.

The anchorage capacity provided by the T-head depends on three factors:

  1. Bearing area of the head
  2. Stiffness of the head
  3. Strength of the head-to-bar connection
sketch of what determines anchorage capacity of headed bars

History of t-head rebar

Anchor plates have been used for anchorages of rods in structures for centuries. The use of the same principle for rebar is a consequence of the development of reinforced concrete. Early examples of headed bars can be found in publications printed more than 100 years ago.

The newer development of headed bars was triggered by more demanding constructions, as offshore concrete structures and the evolution of earthquake engineering that required high structural performance. The use of headed bars in concrete design has created the need for guidelines in the design codes for structural concrete and standardized specifications of the product.

HRC headed reinforcing bars

HRC (Headed Reinforcement Corporation) Europe was a pioneer in the newer development of headed reinforcing bars and has produced such products since 1985. HRC headed bars are characterized by their high performance and consistently high quality.

HRC100/200 Series T-head rebars are manufactured, under strict quality control to ensure a zero-slip connection between the head and the rebar, that exceeds the actual tensile strength of 500MPa-reinforcement bar acc. EN 1992-1-1, Annex C.

Head sizes are designed to transfer the full rebar force into multi-axial stresses in the concrete beneath the head, without crushing the concrete (strength class C30/37 or higher).

Advantages offered by HRC T-head rebars

The ultimate performance of HRC products should be a standard requirement in your design. HRC products give you advantages in structural performance, installation savings and benefits in construction progress and economy.

Consentrated anchorage / HRC Europe
Consentrated anchorage / HRC Europe

The concentrated and stiff anchorage properties of HRC-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.

illustration of development length of straight rebar

Straight anchorage length

illustration of development of rebar with bend

Anchorage bend

illustration of development of rebar with hook

Anchorage by hook

illustration of development length of headed rebar

Mechanical anchorage: HRC T-head

HRC110-T-headed-bars-in-oval-column-agains-blue-sky

Improved robustness at overload and accidental conditions

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

Improved robustness / HRC Europe

Conventional stirrups: straightened and pushing out the concrete cover.

Improved robustness / HRC Europe

Model of test: Left conventional stirrups and T-headed transverse reinforcement to the right.

Improved robustness / HRC Europe

T-headed transverse reinforcement: only cracking of concrete surface.