Technical information

Technical information

The PFEIFER Hybridbeam® composite beam is a prefabricated load-bearing element that is used as a flat beam to create slim floors - integrated ceilings with a low construction height. The standard design of the PFEIFER Hybridbeam® is flush with the ceiling.

Basic types of PFEIFER Hybridbeam ®

 

BHM - central beam

designation: BHM Hc-Bc-W-L

 

BHR - edge beam

designation: BHR Hc-Bc-W-L

 

BHS – special beam

designation: BHS Hc-Bc-W-L

 

1 – Lower flange, thickness tf and overhand Bf; overall width B
2 – Webs with a thickness ts and height hs
3 – concrete core width Bc and height Hc

The beams are made of high-quality materials:

  • steel cross-section: steel S 355 N, S 420 N, S 460 N, in accordance with the PN-EN 10025: 2007 standard;
  • reinforced concrete cross-section: reinforcing steel B 500 B (C) + high-performance concrete HPC - C 60/75;
  • Headed studs for composition: steel S 235 J2 + C 450 according to PN-EN 10025: 2007.

Designations:

  • Hc : beam height from the upper surface of the lower flange [cm]; standard beam heights are adapted to the production programs of pre-stressed hollow core slabs (20, 27, 32, 40, 45 and 50); it is possible to make beams of other heights,
  • Bc : the width of the beam core between the inner walls of the webs – 200 – 700 mm,
  • W: type of beam in a given project - 1 - 99,
  • L: beam length - standard beam lengths are 1600 cm.

Ceiling technology

PFEIFER Hybridbeam® can be used in combination with hollow-channel prefabricated floor slabs in many different combinations depending on the static calculation requirements. Below are the characteristic cross-sections of the beams for the basic variants:

  • hybrid beam equal to the height of the hollow-core slab used,
  • a hollow core ceiling with a structural concrete overlay and connecting stirrups built into the hybrid beam,
  • continuation of the reinforcement with the concrete topping above the hollow-core slabs in the case of a beam higher than the hollow-core floor slabs supported on it,
  • the beam is structurally lower than the floor slabs used and the remaining space is filled with concrete overlay to the level of the upper edge of the ceiling,
  • hybrid beam, for design reasons, higher than the thickness of the hollow-core slabs used; support for hollow-core slabs, the so-called raised - on the longitudinal support of the beam.

 

Different types of cross-sections

Hybrid beam with hollow-core slabs of the same construction height.

 

Hybrid beam in a hollow-core slab ceiling of the same height as the beam. Structural concrete over the ceiling. With a concrete overlay thickness of more than 8 cm, it is possible to expose the connecting stirrups from the cross-section of the beam.

 

Hybrid beam with a height equal to the height of the floor slabs with concrete topping and an option for tensile reinforcement with the upper reinforcement of the floor slab (7 - bendable reinforcement, 6 - screw-in reinforcement).

 

Hybrid beam with built-in connecting reinforcement for concrete topping, provided that the floor slabs are higher than 8 cm from the beam's structural height.

 

Hybrid beam with an increased support for floor slabs (support adapted to the given height of the hollow-core slab).

 

1 - hybrid beam
2- hollow-core floor slab
3 - reinforcement connecting the beam and floor slabs
4 - connecting reinforcement for reinforcement of concrete topping
5 - concrete topping
6 - reinforcement screwed in at the construction site to continue it with the top reinforcement of the concrete overlay
7 - reinforcement bent on site concreted in the beam for continuing with the top reinforcement of the concrete overlay
8 - elastomer washer
9 - concrete of longitudinal raised support for hollow-core slabs
10 – top bars of the concrete topping built in at the construction site

 

In many ceiling solutions, prefabricated composite slabs are used as the load-bearing formwork element for the composite - monolithic - ceiling structure. Standard composite (non-stressed) slabs are produced with a thickness of 7 to 8 cm of a prefabricated slab and a span of up to approx. 9 m. Such ceilings require additional support from a certain span (determined by the statics of the object) during assembly and during the maturation of the filling concrete. When using pre-stressed composite slabs, the thickness of the prefabricated element exceeds 10 cm, and the spans of these slabs reach up to 12 m. For most pre-stressed prefabricated slabs, assembly support is not provided as it is for unstressed elements.

 

Different types of cross-sections

Hybrid beam in combination with a single-span monolithic floor on prefabricated slabs

 

Hybrid beam with the continuing of the reinforcement of the concrete topping embedded in the side surface of the beam

 

Hybrid beam in a multi-span slab floor

 

Hybrid beam protruding above the upper edge of the floor

 

Raised support of a prefabricated panel

 

Suspended support of a prefabricated slab for composite floors

 

1 - hybrid beam
2 - composite reinforced concrete or pre-stressed slab
3 - reinforcement connecting the beam and ceiling
4 - concrete topping
5 - possible execution of the front plate of the floor slabs with a choice of h = -15 mm for the so-called hidden slab support
6 - reinforcement screwed in (or bent) at the construction site to be pulled down with top reinforcement of concrete topping
7 – concrete topping top bars built into the construction site
8 - integrating reinforcement with concrete topping embedded in the beam
9 - elevation of the hybrid beam above the upper edge of the floor slab
10 - concrete of longitudinal raised support for hollow-core slab

Timber is being used again in industrial (and load-bearing) structures of buildings. The structural properties in combination with the low dead weight make wood a more and more desirable material in construction - not only in the form of solid sections, but above all as wooden elements in processed form. Timber in ceiling structures is often combined with concrete, which can be seen in composite timber and concrete structures. These constructions optimally combine the physical properties of materials with such different densities.

 

Types of cross-sections

Hybrid beam with solid timber slabs

 

Hybrid beam with protruding connecting reinforcement and composite timber slabs with concrete topping made on site

 

Hybrid beam with bent or screwed-in continued reinforcement for the reinforcement of the concrete topping

 

Hybrid beam with prefabricated composite timber-concrete slabs

 

Hybrid beam with composite timber beams with on-site concrete topping

 

1 - hybrid beam
2 - timber - glued - full ceiling slab
3 - concrete topping / filling the assembly gap
4 - elastomeric or sealing washer
5 - composite timber-concrete prefabricate
6 - connecting reinforcement for concrete topping
7 - connecting reinforcement (bent or screwed in) continued with concrete topping reinforcement

In the search for an effective cross-section of a ceiling slab, designers use composite concrete ceilings on a sheet with a corrugated or trapezoidal profile. Thanks to the combination of concrete and steel, the ceilings combine the advantages of these materials in the most effective way. These ceilings meet the conditions related to fire resistance and constitute an appropriate sound barrier between rooms. They enable the transfer of not only static loads, but also loads with dynamic characteristics. These ceilings are characterized by a perfectly low parameter of the number of structures in relation to its surface (the equivalent of hollow tile floors).

 

Different types of cross-sections

Hybrid beam for composite floor slabs on a trapezoidal sheet with the same floor slab height

 

Hybrid beam for composite floor slabs on a trapezoidal sheet with a lower height than the floor slab

 

1 - hybrid beam
2 - trapezoidal sheet
3 - reinforcement connecting the beam and the ceiling built at the construction site
4 - head bolts connecting the sheet with the lower flange of the beam
5 - reinforcement embedded in the beam joining with concrete
6 - trapezoidal seal for shuttering openings in trapezoidal sheets

In the construction of monolithic ceilings - beam-slab or the so-called stiffening bands - hybrid beams can be successfully used. Their use often allows to eliminate the problem of piercing the ceiling in the area of the support (column, wall corner) or to reduce the height of the joist or the thickness of the strip. The combination of a beam with a monolithic floor can be achieved thanks to a variety of connection techniques; from continuing the reinforcement with the beam cross-section in a bent form, through the use of reinforcement inserts or reinforcement tightened into the reinforcement connectors concreted into the beam cross-section.

 

Different types of cross-sections

Hybrid beam with a monolithic floor

1 - hybrid beam
3 - reinforcement connecting the beam and the ceiling
4 - concrete of the ceiling
6 - reinforcement screwed in (or bent) on the construction site to continue the reinforcement of the upper ceiling

Download

Reference card

Car park in Bernau

Dokumenty odniesienia

ITB-KOT-2017/0032 wyd.2

Deklaracje

KDWU belka hybrydowa PFEIFER Hybridbeam®

Referencje