MTR® C BEAMS
THESE BEAMS ARE THE BEST SOLUTION
WHERE BUILDINGS REQUIRE FIRE-RESISTANCE

The concrete bottom plate is self-supporting during the assembling and casting phase. It functions as formwork and support for the floor. The MTR® C Beam is suitable to build shopping centres, multi-storey parkings, hotels, convention centres, schools, bridges and industrial buildings.
It is composed of top and bottom chords, in round steel bars or in square steel bars, which are tied by optional additional diagonal braces at the end of the beam, made of structural steel. The bottom-chord are embedded in the concrete plate whose size and concrete quantity are designed accordingly.

If combined with self-supporting and non-self-supporting floors, the MTR® C Beam represents a valid alternative against the prestressed prefabricated systems.

MTR® C BEAM assembly process

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1. Placement of the self –supporting mtr® c 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

For lightweight floors:
• Placement of prefabricated lattice girders
• Placement of expanded polystyrene (eps) lightweight blocks

For floors made of slabs (predalle):
• Placement of slabs

For hollowcore floors:
• Placement of hollowcore slabs
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3. Assembly of the top and bottom additional bars within the mtr® c beams

4. Assembly of the iron bars for the floor

5. Concrete casting

6. Waiting times for concrete maturity

THE BEAM IS ANCHORED ON THE REINFORCED CONCRETE COLUMNS. SUITABLE TO ANY KIND OF FLOOR BOTH SELF-SUPPORTING AND NON-SELF SUPPORTING. IT PROVIDES A VIABLE ALTERNATIVE FOR PRESTRESSED SYSTEM.

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.

Welding

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)

It depends on the bottom concrete cover..

Base

Concrete bottom base finished functioning as formwork and support of the floor.

SUPPORT SYSTEMS AND STRUCTURAL JOINTS

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.

Joint reinforcement

The MTR® T Beam is delivered to the site with the structural column-to-beam connectors. It is made of concrete reinforcing steel B450C.

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Maximumum Post-Fire resistance

In order to determine the post-fire resistance, a correct calculation of the bottom concrete cover is necessary. This avoids using plasters or intumescent varnish.

The MTR® C Beam is suitable to build shopping centres, multi-storey parkings, hotels, convention centres, schools, bridges and industrial buildings.

The advantages of the MTR® C

  • 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
  • Fire-resistance without any additional costs or works