EP0484345B1 - Ameliorations relatives a des poutres composites - Google Patents

Ameliorations relatives a des poutres composites Download PDF

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Publication number
EP0484345B1
EP0484345B1 EP90909826A EP90909826A EP0484345B1 EP 0484345 B1 EP0484345 B1 EP 0484345B1 EP 90909826 A EP90909826 A EP 90909826A EP 90909826 A EP90909826 A EP 90909826A EP 0484345 B1 EP0484345 B1 EP 0484345B1
Authority
EP
European Patent Office
Prior art keywords
ladder
profiles
concrete
steel
connecting elements
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.)
Expired - Lifetime
Application number
EP90909826A
Other languages
German (de)
English (en)
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EP0484345A1 (fr
Inventor
Jörgen Thor
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Individual
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Individual
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Filing date
Publication date
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Publication of EP0484345A1 publication Critical patent/EP0484345A1/fr
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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
    • 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
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders

Definitions

  • the present invention relates to an improvement in a twin-webbed floor beam of steel in composite action with concrete, wherein said beam comprises at least one projecting, horizontal bearing plate for supporting floor structures and said improvement consists of a ladder intended to be fastened to an upper part of the beam in its longitudinal extension.
  • the load carrying capacity of the steel cross-section itself often is so limited that not even the dead load of the floor can be supported, hence the beam must be propped until the concrete has obtained the strength required.
  • the propping involves an evident drawback, since it often is a bar for rational construction.
  • US-A-2 731 824 discloses a steel beam comprising a projecting horizontal bearing plate suitable for supporting floor structures and a ladder which is fastened to an upper part of the beam, and which comprises two longitudinal profiles running parallel to and in a predetermined distance from each other and a number of transverse connecting elements extending between said profiles in a predetermined distance from each other.
  • the function is not a static composite action construction between steel and concrete as the fact is according to the present invention, but the concrete takes mainly the the forces and the function of the steel envelope or housing is to facilitate cross-connecting between the arces.
  • the ties which have a ladderlike appearance have no force transfering function, but only a function in keeping together the two parts of the steel envelope.
  • An object of the present invention is to provide an improvement in the form of a separate and prefabricated ladder in composite beams by which the steel area of the upper part of a beam in a simple way can be increased and hereby increase the compression zone of the steel cross-section before the hardening of the concrete.
  • the ladder also means that the manufacturing of the same can be rationalized in that it can be prefabricated in a number of variants and sizes and be kept in stock for use to different beam sizes depending on loads and spans.
  • the ladder also has such a design that it very easy and quickly can be fixed to the upper part of a floor structure supporting beam e.g by longutudinal, intermittent welding, which also can be performed by an automatic machine.
  • the beam 1 is made of steel and has a form not closer illustrated in the drawing, which admits a composite action with concrete and comprises at least one projecting, horizontal bearing plate 3 for supporting floor structures 4.
  • the prefabricated ladder 2 comprises at least two longitudinal profiles 5 running parallel to and at a predetermined distance from each other, said profiles 5 are positionally fixable to the upper part 6 of the beam 1.
  • the profiles 5 consist of steel bars of rectangular cross section.
  • a number of transverse connecting elements 7 provided in a predetermined distance from each other extend between the profiles 5.
  • the connecting elements 7 consist of steel angle profiles with an apex formation 8, which are fixed by welding to the longitudinal profiles 5 with their axes perpendicular to the webs of said twin-webbed beam.
  • the connecting elements 7 can be designed with any suitable form, but steel angle profiles are to be preferred.
  • the connecting elements 7 are mounted parallel to each other with a mutual spacing of about 200-600 mm along the whole extension of the ladder 2.

Abstract

L'invention concerne une amélioration relative à une poutre en acier ayant une action combinée avec du béton. Ladite poutre (1) comprend au moins une plaque porteuse saillante horizontale (3) destinée à supporter des structures de plancher (4), ladite amélioration étant fixée à une partie supérieure (6) de la poutre dans son extension longitudinale. Ladite amélioration consiste en une échelle préfabriquée (2) comprenant au moins deux profilés longitudinaux (5) parallèles et situés à une distance prédéterminée l'un de l'autre. On peut fixer lesdits profilés en position sur la partie supérieure (6) de ladite poutre (1), un certain nombre d'éléments de raccordement transversaux (7) s'étendant entre ledit profilé, à une distance prédéterminée les uns des autres, afin de permettre la transmission nécessaire des forces de cisaillement pour obtenir une action combinée statique entre ladite poutre (1) et le béton, à laquelle on parvient ultérieurement. Ladite échelle (2), du fait qu'elle augmente la zone de compression de la section transversale de l'acier, est destinée à améliorer la charge admissible de ladite poutre (1) avant le coulage, et élimine ainsi la nécessité d'étançonnement avant le durcissement du béton.

Claims (4)

  1. Une échelle d'une poutre en acier (1) à deux voiles, à utiliser dans une action composite avec du béton, ladite poutre (1) comportant au moins une plaque de support horizontale (3) en saillie pour supporter des structures de plancher (4), et ladite échelle (2) pouvant être fixée à une partie supérieure (6) de ladite poutre (1) à deux voiles, caractérisée en ce que ladite échelle (2) est une échelle séparée et préfabriquée comportant au moins deux profilés longitudinaux (5) s'étendant parallèlement et à une distance prédéterminée l'un par rapport à l'autre, lesdits profilés (5) peuvent être fixés en position à la partie supérieure (6) de la poutre (1), et une pluralité d'éléments (7) de liaison et de cisaillement s'étendent entre lesdits profilés suivant un espacement prédéterminé l'un par rapport à l'autre pour la transmission des forces de cisaillement entre la poutre (1) et le béton sous ladite action composite.
  2. Une échelle selon la revendication 1, caractérisée en ce que les éléments de liaison (7) sont constitués de profilés d'acier en cornière, qui sont fixés aux profilés longitudinaux (5), leurs axes étant perpendiculaires aux voiles de ladite poutre à deux voiles.
  3. Une échelle selon la revendication 1, caractérisée en ce que les profilés longitudinaux (5) sont constitués par des barres en acier de section droite rectangulaire.
  4. Une échelle selon la revendication 1 ou 2, caractérisée en ce que les éléments de liaison (7) sont disposés parallèlement l'un à l'autre suivant un espacement mutuel d'environ 200-600 mm.
EP90909826A 1989-06-15 1990-06-15 Ameliorations relatives a des poutres composites Expired - Lifetime EP0484345B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE8902163A SE466609B (sv) 1989-06-15 1989-06-15 Anordning vid en samverkanbalk
SE8902163 1989-06-15
PCT/SE1990/000427 WO1990015907A1 (fr) 1989-06-15 1990-06-15 Ameliorations relatives a des poutres composites

Publications (2)

Publication Number Publication Date
EP0484345A1 EP0484345A1 (fr) 1992-05-13
EP0484345B1 true EP0484345B1 (fr) 1994-12-21

Family

ID=20376291

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90909826A Expired - Lifetime EP0484345B1 (fr) 1989-06-15 1990-06-15 Ameliorations relatives a des poutres composites

Country Status (5)

Country Link
EP (1) EP0484345B1 (fr)
AU (1) AU5846090A (fr)
DE (1) DE69015360T2 (fr)
SE (1) SE466609B (fr)
WO (1) WO1990015907A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2731824A (en) * 1956-01-24 hadley
DE3366105D1 (en) * 1982-09-20 1986-10-16 South African Inventions Composite floor structures
SE448897B (sv) * 1983-06-21 1987-03-23 Rolf Nystrom Stalbalk med sluten tversnittsprofil och en undersida med i sidled utskjutande flensar, s k hattprofil
US4646496A (en) * 1985-03-21 1987-03-03 Wilnau John A Structural wall and concrete form system
SE457364B (sv) * 1987-05-11 1988-12-19 Joergen Thor Brandmotstaandskraftig bjaelklagsbalk av staal i samverkan med betong

Also Published As

Publication number Publication date
SE8902163D0 (sv) 1989-06-15
DE69015360T2 (de) 1995-08-10
EP0484345A1 (fr) 1992-05-13
SE8902163L (sv) 1990-12-16
AU5846090A (en) 1991-01-08
DE69015360D1 (de) 1995-02-02
WO1990015907A1 (fr) 1990-12-27
SE466609B (sv) 1992-03-09

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