EP0337120A1 - Composite structural beam - Google Patents

Composite structural beam Download PDF

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Publication number
EP0337120A1
EP0337120A1 EP19890104250 EP89104250A EP0337120A1 EP 0337120 A1 EP0337120 A1 EP 0337120A1 EP 19890104250 EP19890104250 EP 19890104250 EP 89104250 A EP89104250 A EP 89104250A EP 0337120 A1 EP0337120 A1 EP 0337120A1
Authority
EP
European Patent Office
Prior art keywords
wing
mixed
core
profile
steel
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Withdrawn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
EP19890104250
Other languages
German (de)
French (fr)
Inventor
Jean-Baptiste Schleich
René Pepin
Achim Rubert
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.)
ARBED SA
Original Assignee
ARBED SA
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
Priority to LU87194 priority Critical
Priority to LU87194A priority patent/LU87194A1/en
Application filed by ARBED SA filed Critical ARBED SA
Publication of EP0337120A1 publication Critical patent/EP0337120A1/en
Withdrawn legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/17Floor structures partly formed in situ
    • E04B5/23Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated
    • E04B5/29Floor 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
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00Structural elongated elements designed for load-supporting
    • E04C3/02Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/29Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/293Joists; 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
    • E04C3/294Joists; 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

Abstract

The composite structural beam comprises a steel section (4) whose web (5) has recesses (7), a concrete slab (1) and reinforcing elements (9). The steel section (4) comprises two flanges, one (3) of which is provided with pins (2) welded onto its outer surface which, itself, is solidly in contact with the concrete slab (1) and the other (6) of which is free to the air. <IMAGE>

Description

  • The present invention relates to a reconstituted composite beam comprising a steel section, the core of which has recesses, reinforcing elements and concrete.
  • Mixed steel-concrete construction has been known for years for its exceptional static and dynamic properties. Efforts to increase the strength, lightness and economic attractiveness of these constructions date from the pre-war period. At that time, metal beams with hollow cores were already used - see in particular the patent FR 706.311. The production of such beams comprises two stages: The cutting of a laminated beam using - for example - a torch along a broken or curved line; then the assembly of the sections thus obtained by joining the projecting parts of one of the sections with the previous projecting parts of the other section. The sections of the initial beam can be made integral by the interposition of rectangular sheet metal elements. It is also possible to increase the rigidity of the new beam by adding additional profiled elements. These beams had only limited success at the time because of their high cost price. Since then, the production of these beams has been fully automated using machines cutting in a zigzag according to a given program, using a torch. Immediately after cutting and without interruption, automatic dressing and welding takes place. A larger reduction in manufacturing prices can be achieved by using a cutting press. However, these alveolar beams, which on one side have greater rigidity and which are capable of supporting more large loads have a height significantly greater than that of a solid beam. This characteristic deprives them of any interest in steel-concrete construction, since it would entail a substantial increase in the total height of a storey and therefore of the complete building.
  • The invention aims to provide a composite steel-concrete beam of low height, compact and light.
  • This object is achieved by the beam according to the invention as it is characterized in claim 1. Preferential alternative embodiments are described in the dependent claims.
  • The advantages which flow from the invention come mainly from its compactness and its reduced weight (reflected in the price of the material, the transport, the assembly and the weight of the construction). There is also the possibility of passing pipes, air conditioning ducts etc. through the alveoli, therefore ease of subsequent rearrangement; moreover, the false ceiling can be in direct contact with the lower wing of the beams.
  • The idea underlying the invention consists in compensating for the loss of rigidity due to the cells in the beam by an optimal interaction beam, concrete slab and reinforcements embedded in the concrete but integral with the beams. The beam-reinforced concrete connection can in principle be carried out by any connector means, such as stud, concrete rod, trellis etc., fixed on the beam and guaranteeing collaboration between the latter and the concrete slab. For certain applications, it will be necessary to use beams made of high quality steel, with very high yield strength, such as steel of the FeE 460 type. Similarly, the concrete must have a minimum thickness. and a high compressive strength, such as of type C 40. It should be noted that the slab is subjected to the usual longitudinal pressure to which is superposed in the present case a localized bending in the cells in the beam.
  • The invention will be better understood with the aid of drawings which show a possible embodiment thereof. We distinguish in
    • - Fig. 1 a section of a floor supported by a reconstructed composite beam and in
    • - Fig. 2 a section along line II - II through FIG. 1.
  • We distinguish in the figures, the concrete layer 1 of the floor in which are embedded the reinforcements 9 and the studs 2 welded to the upper wing 3 of the beam 4. The core 5 of the beam comprises cells 7 of trapezoidal shape separated by teeth 8; the studs 2 are located above all at the level of the teeth. The cells must not extend over the entire height of the core, but a sufficient height of material must be kept to absorb the shearing forces. This height, which is a function of the type of beam - quality of the steel, thickness of the core - is for example 20% of the total height of the core. Both the size and the shape of the cells - trapezoidal, triangular, circular, square, etc. - can vary within wide limits. Note, however, that the quantity of material removed must at most be equal to half the quantity of material from the starting core. It is possible to choose a uniform tooth width over the entire length of the beam.
  • Although it is in principle possible to use laminated beams with symmetrical flanges, it is often advantageous to use reconstituted beams. This technique makes it possible to choose for each wing, the optimal thicknesses and widths; the upper wing 3, providing the foundation for the concrete and for the studs, can be more dimly dimensioned than the lower wing 6 having to absorb the majority of the traction forces. To make these reconstituted beams, it is possible to take T-profiles, cut cells in the core and weld a flat iron having the required dimensions to the profile at the teeth.
  • A more elegant way of proceeding is to take a beam obtained by rolling, for example of the IPEA or HEAA type, to cut it along a trapezoidal line into two equivalent parts and to solder a flat iron on each set of teeth. This makes it possible to reconstruct two mixed cellular beams from a single laminated beam, which represents a definite economic advantage.
  • In the example shown, the beams are spaced 2.40 meters apart, for example, and have the following characteristics:
    core height: 300 mm
    upper wing thickness: 15 mm
    upper wing width: 150 mm
    lower wing thickness: 13 mm
    lower wing width: 300 mm
    cell height: 250 mm
    large base of a cell: 500 mm
    small base of a cell: 200 mm
    number of studs per tooth: 4
    concrete layer thickness: 120 mm
  • The whole, beam-concrete, as shown in FIG. 2, can be prefabricated at the factory and sold in widths and lengths up to 3 m and 10 m respectively. The dimensions of this prefabrication are obviously limited by the means of transport available.

Claims (10)

1. Reconstituted composite beam comprising a steel profile, the core of which has recesses, reinforcing elements and concrete, characterized in that the profile (4) has two wings, the first of which (3) is in contact with less over its entire external surface with a concrete slab (1) provided with reinforcements (9) and the second (6) of which is in the open air, in that the recesses (7) in the core are extend from said first wing (3) over at most 90% of the height of the core and in that connecting means are fixed on the external face of said first wing (3) at least in places where the soul does not have a recess and extends into the reinforced concrete slab (1).
2. Mixed beam according to claim 1, characterized in that the recesses (7) have a trapezoidal, square, circular or oval shape.
3. Mixed beam according to claim 1, characterized in that the concrete slab has at least a thickness of 10 centimeters.
4. Mixed beam according to claim 1, characterized in that the connector means are studs (2) welded to the external face of said first wing.
5. Mixed beam according to claim 4, characterized in that the studs (2) are arranged in groups of four.
6. Mixed beam according to claim 1, characterized in that a recess (7) extends at most over 80% of the height of the core.
7. Mixed beam according to claim 1, characterized in that said first wing (3) of the profile has a width less than said second wing (6).
8. Mixed beam according to claim 1, characterized in that said first wing (3) of the profile has a thickness less than said second wing (6).
9. Combined beam according to claims 1, 7 or 8, characterized in that said first wing (3) of the profile has a lower quality steel than that of said second wing (6).
10. Mixed beam according to claims 1 or 9, characterized in that the steel of the second wing (6) is at least of the FeE460 type.
EP19890104250 1988-04-11 1989-03-10 Composite structural beam Withdrawn EP0337120A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
LU87194 1988-04-11
LU87194A LU87194A1 (en) 1988-04-11 1988-04-11 Reconstituted mixed beam

Publications (1)

Publication Number Publication Date
EP0337120A1 true EP0337120A1 (en) 1989-10-18

Family

ID=19731040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890104250 Withdrawn EP0337120A1 (en) 1988-04-11 1989-03-10 Composite structural beam

Country Status (2)

Country Link
EP (1) EP0337120A1 (en)
LU (1) LU87194A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695150A1 (en) * 1991-09-25 1994-03-04 Est Centre Etudes Tech Equipem Mixed module connector - comprises hollow tube housed in hole and locked in T support by peripheral elastic clamps with tube and part of support submerged in concrete
US6012256A (en) * 1996-09-11 2000-01-11 Programmatic Structures Inc. Moment-resistant structure, sustainer and method of resisting episodic loads
EP1278922A1 (en) * 2000-04-26 2003-01-29 Flex-Frame L.L.C Open web dissymmetric beam construction
EP1801302A2 (en) * 2005-12-20 2007-06-27 Ennio Plateroti Floor panel
EP2440717A1 (en) 2009-06-12 2012-04-18 NV Bekaert SA High elongation fibres
CN102418381A (en) * 2010-09-28 2012-04-18 杨峰 Building structure system combined with steel beam and pre-tensioned prestressing superposed beam and construction method for building structure system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB937440A (en) * 1960-04-07 1963-09-18 United Steel Companies Ltd Improvements relating to metal members for use in composite structural parts of concrete and metal
FR1355345A (en) * 1963-05-06 1964-03-13 Macomber composite structure joist floor
GB1313947A (en) * 1970-11-23 1973-04-18 British Steel Corp Steel-framed building and a method of constructing steel framed buildings
GB1341824A (en) * 1969-10-31 1973-12-25 Williams G M J Fuller M E Composite structural members
DE2239572A1 (en) * 1972-08-11 1974-02-21 Gerhard Dipl Ing Tuch Verbundtraeger with serrated flanschauflagerung and raised schubverduebelungen and reinforced concrete plates made ready to share
US4115971A (en) * 1977-08-12 1978-09-26 Varga I Steven Sawtooth composite girder

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB937440A (en) * 1960-04-07 1963-09-18 United Steel Companies Ltd Improvements relating to metal members for use in composite structural parts of concrete and metal
FR1355345A (en) * 1963-05-06 1964-03-13 Macomber composite structure joist floor
GB1341824A (en) * 1969-10-31 1973-12-25 Williams G M J Fuller M E Composite structural members
GB1313947A (en) * 1970-11-23 1973-04-18 British Steel Corp Steel-framed building and a method of constructing steel framed buildings
DE2239572A1 (en) * 1972-08-11 1974-02-21 Gerhard Dipl Ing Tuch Verbundtraeger with serrated flanschauflagerung and raised schubverduebelungen and reinforced concrete plates made ready to share
US4115971A (en) * 1977-08-12 1978-09-26 Varga I Steven Sawtooth composite girder

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695150A1 (en) * 1991-09-25 1994-03-04 Est Centre Etudes Tech Equipem Mixed module connector - comprises hollow tube housed in hole and locked in T support by peripheral elastic clamps with tube and part of support submerged in concrete
US6012256A (en) * 1996-09-11 2000-01-11 Programmatic Structures Inc. Moment-resistant structure, sustainer and method of resisting episodic loads
EP1278922A1 (en) * 2000-04-26 2003-01-29 Flex-Frame L.L.C Open web dissymmetric beam construction
EP1278922A4 (en) * 2000-04-26 2007-01-03 Girder Slab Technologies Llc Open web dissymmetric beam construction
EP1801302A2 (en) * 2005-12-20 2007-06-27 Ennio Plateroti Floor panel
EP1801302A3 (en) * 2005-12-20 2010-07-28 Ennio Plateroti Floor panel
EP2440717A1 (en) 2009-06-12 2012-04-18 NV Bekaert SA High elongation fibres
CN102418381A (en) * 2010-09-28 2012-04-18 杨峰 Building structure system combined with steel beam and pre-tensioned prestressing superposed beam and construction method for building structure system
CN102418381B (en) * 2010-09-28 2014-09-17 杨峰 Building structure system combined with steel beam and pre-tensioned prestressing superposed beam and construction method for building structure system

Also Published As

Publication number Publication date
LU87194A1 (en) 1989-11-14

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