EP0163717A1 - Composite beams for bridge-decks and floor constructions - Google Patents

Composite beams for bridge-decks and floor constructions

Info

Publication number
EP0163717A1
EP0163717A1 EP19850900234 EP85900234A EP0163717A1 EP 0163717 A1 EP0163717 A1 EP 0163717A1 EP 19850900234 EP19850900234 EP 19850900234 EP 85900234 A EP85900234 A EP 85900234A EP 0163717 A1 EP0163717 A1 EP 0163717A1
Authority
EP
European Patent Office
Prior art keywords
flange
steel
concrete slab
sides
top flange
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19850900234
Other languages
German (de)
French (fr)
Inventor
Karl Erik Ellner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0163717A1 publication Critical patent/EP0163717A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • E04C3/294—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 of concrete combined with a girder-like structure extending laterally outside the element
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/02—Bridges characterised by the cross-section of their bearing spanning structure of the I-girder type
    • 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
    • E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
    • E04B5/04—Load-carrying floor structures formed substantially of prefabricated units with beams or slabs of concrete or other stone-like material, e.g. asbestos cement
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/20—Concrete, stone or stone-like material
    • E01D2101/24—Concrete
    • E01D2101/26—Concrete reinforced
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/30—Metal

Definitions

  • This invention relates to a beam construction composed of a steelbeam roller or a welded steel beam and a concrete slab resting on the steel beam and bonded to the same with suffi ⁇ cient rigidity as to restrain the shear stresses developed from the load.
  • the concrete slab together with the steel area above the neu ⁇ tral axis of the composite beam forms the zone of compression of the composite beam. More especially the invention relates to beams in which the concrete slab constitutes the floor when the composite members are spaced in accordance with load and span.
  • the shrinking produces a bending moment in the composite beam with tensile stresses in the concrete slab and in the bottom flange of the steel beam. In the top flange the shrinking produces compressive stresses but all these shrink- ing stresses diminish when the composite beam is loaded with use ⁇ ful load.
  • the main object of the improved composite beam is tb secure the connection between the concrete slab and the top flange of the steel beam with sufficient rigidity so as to develop the same de- formation in the concrete slab as in the steel in compression.
  • the invention has two embodiments:
  • FIG. 1 is a cross section in line A - A on the Figure 2 of the single-symmetrical welded beam with the ridges across the flange on both sides.
  • Figure 2 is a vertical section view on the line B - B of Figure 1 of the welded steel beam and the concrete slab.
  • Figure 3 shows a vertical section view in detail C on Figure 2 of the profiling of the top flange.
  • the distance between the screws varies in relation to the shearing forces between the concrete slab and the steel beam.
  • Figure 4 is a cross section in the line D - D on Figure 5 of a rol- led steel beam with the two one-sided profiled steel plates tightly screwed onto the top flange, and the concrete slab.
  • Figure 5 is a vertical cross section view on the line E - E on Fi ⁇ gure 4 of the steel beam and the concrete slab.
  • Figure 6 shows a vertical section view in detail F on Figure 5 of the top flange and the one-sided profiled steel plates tightly attached with screws.
  • drawing 1 indicates a welded steel beam
  • 13 indicates a con ⁇ crete slab into which the doubble-sided profiles flange 12 is cast.
  • the ridges 14 have the effect transfering the shearing forces bet- ween the top flange 12 and the concrete slab 13.
  • the drawing also shows a supporting steel plate 15 and the web stiffening steel plates 16.
  • 21 indicates a rolled steel beam
  • 23 indicates a con ⁇ crete slab into which the flange 22 firmly attached one-side profiled plates 24 are cast.
  • the attachment can be done with steel- construction screws 25 or by welding.
  • the ridges 26 on the plates 24 have the effect of transfering the shearing forces between the top flange 22 and the concrete slab 23.
  • the drawing also shows the supporting steel plate 27 and the web stiffening steel plates 28.

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)
  • Rod-Shaped Construction Members (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

Poutre composite améliorée se composant d'une dalle de béton et d'une poutre en acier dont le rebord supérieur est coulé dans la dalle, caractérisée par le fait que le rebord supérieur est profilé sur les deux côtés, transférant ainsi les forces de cisaillement entre le rebord supérieur (12) ou (22) et la dalle de béton (13) ou (23) respectivement. La poutre composite se caractérise par le fait que le rebord supérieur (12) de la poutre soudée (11) est exécuté entre des rouleaux avec des rainures dans le calandrage final, de sorte que la plaque du rebord (12) présente des nervures (14) sur les deux côtés au travers du rebord (12). La poutre en acier calandré (21) possède des plaques en acier (24) profilées sur une face, les arêtes (26) étant fixées rigidement sur le rebord supérieur (22).Improved composite beam consisting of a concrete slab and a steel beam, the upper edge of which is poured into the slab, characterized in that the upper edge is profiled on both sides, thereby transferring the shear forces between the upper edge (12) or (22) and the concrete slab (13) or (23) respectively. The composite beam is characterized in that the upper flange (12) of the welded beam (11) is executed between rollers with grooves in the final calendering, so that the flange plate (12) has ribs (14 ) on both sides through the flange (12). The calendered steel beam (21) has steel plates (24) profiled on one face, the edges (26) being rigidly fixed on the upper edge (22).

Description

COMPOSITE BEAMS FOR BRIDGE-DECKS AND FLOOR CONSTRUCTIONS
This invention relates to a beam construction composed of a steelbeam roller or a welded steel beam and a concrete slab resting on the steel beam and bonded to the same with suffi¬ cient rigidity as to restrain the shear stresses developed from the load.
The concrete slab together with the steel area above the neu¬ tral axis of the composite beam forms the zone of compression of the composite beam. More especially the invention relates to beams in which the concrete slab constitutes the floor when the composite members are spaced in accordance with load and span.
Floor constructions having steelbeams as load bearing members and a concrete slab transmitting the load to said beams are usu¬ ally design in such a manner that the stresses in the steel beams shall balance the bending moments without any contri¬ buting effect from the concrete slab between the beams. No contri¬ buting effect can be secured because nothing is done to secure a sufficiently rigid connection between the steel beams and the concrete slab as is the case with the improved beam. Of course so-called 'Studs' have been welded to the top-flanges of steel beams in some bridge-constructions but the cost and the demand of control!-inspections have placed obstacles in the way. By sufficiently bonding the concrete slab to the steel beam so that the slab will be forced to deform in the same proportion as the top flange of the beam,as will be described below, a consid¬ erable saving of steel can be obtained. In this way the zone of compression will be composed of the steel area above the neutral axis of the composite beam, in addition to the area of the concrete slab between the steel beams, as compared to the steel alone, as with present constructions. Furthermore an additional saving of steel in the bottom flange is obtained, owing to the fact that the level arm between the tension member and the neutral axis of the improved composite beam is in percentage considerably greater than with a regular steel beam. The saving of steel in the bottom flange is in proportion to these levelarms for useful load.
O PI There is another aspect on the composite beam, the shrinking in the concrete slab. The shrinking produces a bending moment in the composite beam with tensile stresses in the concrete slab and in the bottom flange of the steel beam. In the top flange the shrinking produces compressive stresses but all these shrink- ing stresses diminish when the composite beam is loaded with use¬ ful load.
The main object of the improved composite beam is tb secure the connection between the concrete slab and the top flange of the steel beam with sufficient rigidity so as to develop the same de- formation in the concrete slab as in the steel in compression. The invention has two embodiments:
1. A welded steel beam, see drawing 1.
The finish rolling of the steel plate to the top flange is manufac¬ tured between rollers with groves parallel to the axis of the roll- ers at the same distance round the mantel area. The flange plates gets ridges on both sides across the flange. These ridges secure the connection between the concrete slab and the steel beam with sufficient rigidity. The ridges also give the normal gap between the web and flange at the welding of the beam. Figure 1 is a cross section in line A - A on the Figure 2 of the single-symmetrical welded beam with the ridges across the flange on both sides.
Figure 2 is a vertical section view on the line B - B of Figure 1 of the welded steel beam and the concrete slab. Figure 3 shows a vertical section view in detail C on Figure 2 of the profiling of the top flange.
2. A Rolled steel beam, see drawing 2.
With a rolled steel beam one has slight possibility at the rolling mill to make the profiling across the top flange. On the other hand one has the possibility to weld or tight screw one-sided profiled steel plates onto the two sides of the flange which are to be cast in the concrete slab. Naturally the ridges shall extend across the flange. Steel-construction screws must be used. The screwheads and nuts also function as the 'Studs' mention- ed earlier.
JO PI _, "wϊϊ-o" On the drawing 2 the screws are shown in the second alternative.
The distance between the screws varies in relation to the shearing forces between the concrete slab and the steel beam.
Figure 4 is a cross section in the line D - D on Figure 5 of a rol- led steel beam with the two one-sided profiled steel plates tightly screwed onto the top flange, and the concrete slab.
Figure 5 is a vertical cross section view on the line E - E on Fi¬ gure 4 of the steel beam and the concrete slab.
Figure 6 shows a vertical section view in detail F on Figure 5 of the top flange and the one-sided profiled steel plates tightly attached with screws.
On drawing 1. 11 indicates a welded steel beam, 13 indicates a con¬ crete slab into which the doubble-sided profiles flange 12 is cast. The ridges 14 have the effect transfering the shearing forces bet- ween the top flange 12 and the concrete slab 13. The drawing also shows a supporting steel plate 15 and the web stiffening steel plates 16.
On drawing 2, 21 indicates a rolled steel beam, 23 indicates a con¬ crete slab into which the flange 22 firmly attached one-side profiled plates 24 are cast. The attachment can be done with steel- construction screws 25 or by welding. The ridges 26 on the plates 24 have the effect of transfering the shearing forces between the top flange 22 and the concrete slab 23. The drawing also shows the supporting steel plate 27 and the web stiffening steel plates 28.
OMP
* . W1H

Claims

1. An improved composite beam consisting of a concrete slab and a steel beam whose top flange is cast into the concrete slab characterized by having the top flange profiled on both sides and thus transfers the shearing forces between the top flange (12) or (22) and the concrete slab (13) or (23) respectively.
2. The improved composite beam according claim 1 is characterized by the fact that the top flange (12) on the welded steel beam (11) is manufactured between rollers with grooves in the fi- nish rolling so that the flange plate (12) gets ridges (14) on both sides across the flange (12).
3. The improved composite beam according to claim 1 is"character¬ ized by the fact that the flange (22) on the rolled beam (21) has on both sides firmly attached one-side profiled steel plates (24) with the ridges (26) across the flange (22).
OMPl
EP19850900234 1983-11-30 1984-11-30 Composite beams for bridge-decks and floor constructions Withdrawn EP0163717A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8306633 1983-11-30
SE8306633A SE8306633L (en) 1983-11-30 1983-11-30 METHOD OF TAKING UP THE ADJUSTMENT BETWEEN CONCRETE PLATE AND INSTALLED BALK FLANGE 1) BY WELDED BALK IN DRAWING 1 2) BY ROLLED BALK IN DRAWING 2

Publications (1)

Publication Number Publication Date
EP0163717A1 true EP0163717A1 (en) 1985-12-11

Family

ID=20353539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850900234 Withdrawn EP0163717A1 (en) 1983-11-30 1984-11-30 Composite beams for bridge-decks and floor constructions

Country Status (3)

Country Link
EP (1) EP0163717A1 (en)
SE (1) SE8306633L (en)
WO (1) WO1985002432A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103452237A (en) * 2013-09-16 2013-12-18 南京工业大学 Light rectangular steel pipe-concrete combined compression flange and corrugated web combined box girder
CN104213673A (en) * 2013-09-16 2014-12-17 南京工业大学 Light steel pipe-concrete combined corrugated web H-shaped section combination beam
US9809978B2 (en) * 2015-07-05 2017-11-07 Constantine Shuhaibar Structural system and method using monolithic beams having improved strength
US10087628B2 (en) * 2015-07-05 2018-10-02 Constantine Shuhaibar Structural system and method using monolithic beams having improved strength
CN114439144B (en) * 2021-12-22 2023-05-26 上海建工四建集团有限公司 Steel structure composite floor slab and construction method thereof

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1245395A (en) * 1916-04-03 1917-11-06 Edward Smulski Concrete-reinforcing means.
US1936147A (en) * 1930-08-04 1933-11-21 Leonie S Young Floor or roof joist construction
US1885883A (en) * 1930-09-22 1932-11-01 Leonie S Young Joist construction
US1922340A (en) * 1930-09-22 1933-08-15 Leonie S Young Concrete construction
US2028169A (en) * 1934-07-09 1936-01-21 Rolf K O Sahlberg Composite beam

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8502432A1 *

Also Published As

Publication number Publication date
SE8306633D0 (en) 1983-11-30
SE8306633L (en) 1985-06-02
WO1985002432A1 (en) 1985-06-06

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19851031