Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
  • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
  • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
  • E04B5/17—Floor structures partly formed in situ
  • E04B5/23—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated
  • E04B5/29—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated the prefabricated parts of the beams consisting wholly of metal
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
  • E04C3/00—Structural elongated elements designed for load-supporting
  • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
  • E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
  • E04C3/293—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete

Definitions

• a beam intended for cooperation with beton is
• the present invention relates to a beam having provided thereon devices which function to improve the connection between the beam and a concrete mass cast or moulded against said beam, and therewith to enhance the mutual coaction between beam and concrete.
• the invention relates to the problem of binding steel profiles to concrete in a manner which will prevent sliding between the two materials and thus ensure that occurrent shear forces are transmitted therebetween, this transmission of shear forces being necessary if effective coaction between the materials is to be obtained.
• the most common field of application lies in beam profiles which support a concrete slab or plate on the lower flange of said beam, said slab being capable of
• Another field of application lies in column or pillar structures which incorporate an internal steel-profile core and a concrete mass cast around said core, for different reasons; if an effective shear bond is achieved, the concrete can be used for force transmission purposes and for increasing the rigidity of the column (inertia radius).
• the studs must also be relatively long, so that the shear-capacity of the studs is not restricted excessively by crush zones in the concrete. This constitutes problems when the outer surface of the concrete grout lies close to the steel profile. Furthermore, the studs are easily bent when subjected to load, which contributes towards fracturing of the concrete in the vicinity of the studs. Those methods in which blocks and ties are used also require the application of manual welding operations;
• the object of the present invention is to provide an alternative anchorage device which can be welded quickly to the beam and which will result in coaction between the beam and the concrete which is at least equally as effective as the coaction achieved with methods known hitherto.
• the anchoring device may be produced in the same lengths as the beams, and may comprise a flat bar which has been pressed or rolled to a configuration such as to obtain the aforesaid large crush areas .
• the anchoring device is given a configuration such that when embedded or grouted in the concrete, it is impossible for the device to twist or bend in any direction, but will result in crushing of the concrete over a large area thereof.
• the anchoring device may also consist of angle iron, although in this case the crush area will be small in the longitudinal direction of the device when shear takes place, unless the legs of the angle iron are appropriately deformed prior to the concrete being cast.
• the anchoring device is configured with a straight foot part, which is welded to the beam and which merges with a curved part intended for embedment in the concrete and which extends in wave-form in the longitudinal direction of the anchoring device, alternately on both sides of the foot part, with the greatest amplitude at its free edge.
• a straight foot part which is welded to the beam and which merges with a curved part intended for embedment in the concrete and which extends in wave-form in the longitudinal direction of the anchoring device, alternately on both sides of the foot part, with the greatest amplitude at its free edge.
• an elongated anchoring device configured in accordance with the invention can be manufactured from simple starting material in an automated process and can be welded to the beam in a conventional automatic welding line.
• the anchoring device can be welded to the beam at the same time as the beam components are welded together.
• the application of heat is more gentle than in the case of resistance welding.
• the invention can be applied with particular advantages in the construction of beam floor structures, in which steel load-carrying beams are placed on the same level as flooring slabs, irrespective of whether these slabs are moulded on-site or prefabricated with concrete cast on site on the upper side of the slabs and jointed onto the steel beams.
• floor structures of this configuration which is rapidly winning ground in its prefabricated variant - it is particularly important to ensure that the aforesaid coaction will be achieved, since the low cross-sections of the beams used result in problematic downward flexing of the beams, which problem can be counteracted by using concrete to enhance the bending resistance of the beam zones, such concrete being necessary under all circumstances. This can have particular importance in the event of fire.
• the dimensions and quality of the starting material can be varied, so as to be adequate for different fields of use. For instance, different dimensions are required for bridge deck structures than for the floor structures of conventional domestic dwellings.
• Figure 1 is a plan view of the anchoring device; and Figure 2 is a cross-sectional view of a beam provided with the anchoring device and shows one end of a concrete flooring slab placed adjacent the beam and grouted in concrete.
• Figure 1 illustrates a preferred embodiment of an anchoring device 1, seen from the right in Figure 2.
• the foot part 2 of the anchoring device is welded to the web 4 of the beam 3 and the main part 5 of the anchoring device, i.e. the part thereof which is embedded or grouted in the concrete, extends in a wave form, symmetrically and alternately on both sides of the foot part 2.
• the free edge 6 of the main part 5 has the greatest amplitude.
• the beam has a bottom and a top flange 7 and 8 respectively, between which one end part 9 of a concrete flooring slab 10 is fitted.
• a space located between the beam 3 and the end part 9 of the slab 10 is filled with jointing or grouting concrete 11, which surrounds the anchoring device 1 and merges with a layer 12 of top concrete, which spreads along the concrete slabs 10 and the upper flange 8 of the beam 3, to increase the bending resistance of the structure with regard to downward bending.
• an anchoring device can be welded solely to one side of the web with good results, even when concrete slabs are placed on both sides of the web.
• the anchoring device may also have the form of a flat strip having formed therein two longitudinally extending, parallel slots with short interruptions, these slots enabling tongues to be bent out from the anchoring device, alternately in opposite directions, optionally while twisting the tongues.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Chemical & Material Sciences (AREA)
• Composite Materials (AREA)
• Joining Of Building Structures In Genera (AREA)
• Rod-Shaped Construction Members (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 1988
  • 1988-07-13 SE SE8802618A patent/SE462991B/sv not_active IP Right Cessation
• 1989
  • 1989-07-11 WO PCT/SE1989/000405 patent/WO1990000653A1/en not_active Ceased
  • 1989-07-11 EP EP89908546A patent/EP0425560A1/en not_active Withdrawn
  • 1989-07-11 FI FI910120A patent/FI910120A0/fi not_active Application Discontinuation
• 1991
  • 1991-01-11 DK DK005091A patent/DK5091A/da not_active Application Discontinuation

Non-Patent Citations (1)

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