Self-supporting system,
reinforcement and formwork in a single element

The MTR® A Beam, with the steel bottom plate, is self-supporting during the assembly and casting phase of the floor. It allows us to meet the architectural requirements so it represents the alternative and ideal solution against the limitations of the traditional systems.
The MTR® A Beam has the CE Marking according to the UNI EN 1090-1:2012. It is composed of a bottom plate, top chords, and structural steel webs. It is filled with in-situ concrete.

This building structure solution makes possible to build structural frames no matter what seismic design category combining different kinds of floors according to the building and its function.

MTR®A Beam assembly process

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1. Placement of the self –supporting mtr® a beam on the columns

2.Floor assembly:

For floors made of clay bricks and concrete:
• Placement of prefabricated or prestressed lattice girders
• Placement of hollow clay bricks
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For lightweight floors:
• Placement of prefabricated lattice girders
• Placement of expanded polystyrene (eps) lightweight blocks
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1.For floors made of slabs (predalle):
Placement of slabs

2.For hollowcore floors:
Placement of hollowcore slabs

3. Assembly of the top and bottom additional bars within the beams

4. Assembly of the iron bars for the floor

5. Concrete casting

6. Waiting times for concrete maturity


Technical specification

Steel Structure

It is made of structure steel according to the EN ISO 10025-2 standard.

Concrete finishing

Class C25/30, unless otherwise indicated.

Self-supporting feature

The beam carries itself and the floor since it has been placed on the columns, before the concrete casting.


Continuous wire welding with shielding gas (Process UNI EN ISO 4063-135) according to the NTC of 2008.

Normative References

In the first phase, we refer to the paragraph no. 4.2 of the NTC of 2008 and to the Eurocode 3; in the second phase, we refer to the paragraph no. 4.2 of the NTC of 2008 and to the Eurocodes 2 and 4. For the structures built in seismic zones, we refer to the chapter no. 7 of the NTC 2008 and to the Eurocode 8.

Engineering Design Process

Our engineers follow the calculation procedure of the Software MTR® according to the existing law.

Post-fire mechanical properties (R)

We use intumescent varnish, heat-resistant plaster or fire protection plasterboards.


Base plate made of structure steel according to the EN ISO 10025-2 standard. It functions as reinforcement carrying the floor and as formwork for the concrete casting.


The beams of the MTR® System lie on vertical supporting elements, columns and walls by an appropriate support system, which is welded at the end of beams. It is custom-made in order to avoid interference with the starter rebars.
The B450C steel bars for reinforced concrete allows making structural joints that connect the elements of the MTR® system with the adjoining supporting elements, such as continuous beams, partition walls and columns.

After concrete maturity, the elements of the MTR® system are considered as composite steel and concrete structures, but the section where the beam anchors to the column is a section made of normal concrete, from a bending point of view.
The design of the beam-to-column joints assures the necessary dissipative and ductile behavior while following the criteria of capacity design.

How a beam is supported

The MTR® Beams are supported by walls or columns through the specific end-anchored systems.


The MTR® A Beams are delivered to the site with the structural column-to-beam connectors. They are made of concrete reinforcing steel B450C.


Maximun design freedom

The MTR® A Dropped Beam has the metal formworks for the down-stand element. It represents an alternative to the both prefabricated and reinforced concrete beams. The dropped beam is useful for long span floors whose upper surface not only functions as a covering floor but it can support offices or flats.

The MTR® A Spandrel Beam has the metal formworks for the up-stand element. It represents an alternative to the prefabricated beams. The dropped beam is suitable for long span floors and allows the effective depth to be used.

The MTR® A Slim-floor Beam, has the metal formworks only for the edge beams. It is used in different sectors such as residential, industrial, commercial and tertiary.

The MTR® A Custom Beam can be an arched beam, a slope beam, a double-sloped beam. It can be used in many different ways and can meet any structural requirement.

The advantages of the MTR® A Beam

  • Reduction of floor building times of 70%.
  • Reduction of the number of columns and their sections
  • Reduction of height and width beam sections
  • Reduction of column buckling
  • Reduction of the concrete used for beams
  • Total elimination of formworks and props