EP0212593A2 - Composite beam - Google Patents

Composite beam Download PDF

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Publication number
EP0212593A2
EP0212593A2 EP86111326A EP86111326A EP0212593A2 EP 0212593 A2 EP0212593 A2 EP 0212593A2 EP 86111326 A EP86111326 A EP 86111326A EP 86111326 A EP86111326 A EP 86111326A EP 0212593 A2 EP0212593 A2 EP 0212593A2
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EP
European Patent Office
Prior art keywords
recesses
beam according
concrete
profiles
profile
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Granted
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EP86111326A
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German (de)
French (fr)
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EP0212593A3 (en
EP0212593B1 (en
Inventor
Jean-Baptiste Schleich
Raymond Baus
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Arcelor Luxembourg SA
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Arbed SA
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Priority to AT86111326T priority Critical patent/ATE62307T1/en
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Publication of EP0212593B1 publication Critical patent/EP0212593B1/en
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    • 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

  • the invention relates to a composite beam essentially consisting of steel profiles and concrete, the interior of the contour defined by the profiles is filled with concrete, possibly reinforced, and at least one of the profiles of which has the external face of its wings. discovered.
  • a composite beam can in particular be used as a post or floor support and has excellent fire resistance.
  • Such fire-resistant composite beams have for example been described in patents LU 84 772 and LU 84 966.
  • the concrete filling mass is connected to the core of the profile by reinforcements, such as lattices, T-bars. or head studs.
  • the section of the steel profile, the concrete section and the reinforcement section contribute according to their mechanical properties, which are a function of temperature, and their percentage of section, to the transmission of loads.
  • the load absorption function moves continuously from the section of the steel section to the section of reinforced concrete. Laboratory fire tests have shown that despite the high thermal conductivity of steel, such beams retain their load-bearing capacity beyond the required 90 minutes.
  • the object of the present invention is to avoid this drawback and to propose a composite beam, the hot properties of which are no longer dependent on the exposed steel surfaces and which leaves all latitude in its architectural design.
  • One of the major advantages of the invention consists in the fact that it allows the control of the flow of calories as well as their guiding towards places of the beam whose heating has only a limited influence on the lift of the together. In this way beams, which have a high lift when cold, but large areas of exposed steel, keep an acceptable lift when hot. Note that we can take advantage of the recesses in the profiles to position a hoop reinforcing the concrete.
  • Figs. 1 and 2 represent the isotherms (in degrees Celsius) in a quarter cross section of two known beams, after having exposed them to fire for 90 minutes.
  • the concrete filling 2 apart from the wide web sections 1 (type HE 650 AA), the concrete filling 2.
  • the two structures are distinguished by the fact that that shown in Fig. 1 comprises a reinforcement 4 (the concrete rods have been given a square section for reasons of convenience), while the structure shown in FIG. 2 has, instead of an armature, a profile H (reference 3) welded to the core of profile 1.
  • the temperature of the coldest point located each time in the concrete, is only worth 100 ° C for the variant shown in Fig. 1 while it is 220 ° C in the case of FIG. 2.
  • the most serious fact is that the temperature of the central part of the core of the profile is more than twice as high in the case of FIG. 2 (255 ° C resp. 117 ° C).
  • the presence of the section 3 reduces, as a result of the external surface 5 of one of its wings exposed to the action of fire, in unacceptable proportions the fire resistance of the assembly.
  • Fig. 3 shows a cross section through a composite beam formed by a profile 31 with a high height core and by two profiles 33 with a low height core, the wings of which are fixed by welding to the core of the profile 31.
  • the inside of the outline octagonal defined by the profiles is filled with concrete 32.
  • profiles are provided in the core with recesses 34.
  • these recesses 34 have an elongated shape and are located near the wing, close to the bulge of metal existing at the point of the passage of the core to the wing of the profile.
  • a second series of elongated recesses 44 can be provided, vertically offset (see FIG. 5).
  • the length 45 of such a recess, produced by flame cutting, is about twenty cm and its width 46 is two cm.
  • the heat flux which progresses, for conventional beams, easily from the exposed surface towards the central part of the core, is slowed down by the presence of these recesses, whether they fill with concrete during manufacture or not.
  • the thermal brake is obviously more effective when the concrete does not penetrate into the recesses, which can be ensured by housing therein material with low thermal conductivity, such as styropor.
  • Composite beams, produced according to the variants according to Figs. 4 and 5 have fire resistances which are worth 1.5 times respectively twice that of an identical structure, but without recesses in the core.
  • elongated recesses can be given, according to manufacturing constraints, any other shape and arrangement capable of ensuring the desired goal.
  • angles 71, concrete bars 72, square bars 73 or flat bars 74 are fixed to it by welding.
  • angles 71 are combined with the recesses shown in FIG. 6, we can take advantage of the holes 61 (located at the extreme right of this figure) to bolt the angle iron to the core.
  • the concrete bars 72 are joined together and fixed to the web of the profile using spot welding.
  • Auxiliary structures not only increase cold and hot load-bearing capacity of the composite beam but also favorably influence the heat flow when hot. Indeed, there is redistribution of calories from the core to the concrete thanks to the cooling fin effect that these auxiliary structures play. This effect is particularly pronounced for the angles 71 and the flat irons 74.
  • the central metal parts 75 and 76 of the sections 31 and 33 are therefore all the less heated.
  • Fig. 8 has been shown a composite beam with rectangular section, constituted by a profile 81, with a high height core and two profiles 82, with a low height core.
  • the composite beam with hexagonal section shown in Fig. 9, is constituted by concrete 32 and a solid central tube 91 to which have been welded, with an offset of 120 °, three T-profiles 92.
  • the recesses 34 provide this beam, despite the high exposed metal / metal ratio protected by concrete, acceptable fire resistance. It is nevertheless advisable to additionally have angles 71 or flat irons 74 near the recesses 34.
  • the composite beam with hexagonal section shown in Fig. 10, is constituted by concrete 32 and a very high-profile core 101, to which two T-profiles 102 have been fixed by welding.
  • the recesses 34 which have also been provided in the profiles 102 are, as a result of their small exposed area, not absolutely necessary.
  • the composite beam with triangular section and rounded corners shown in Fig. 11, is made up of concrete 32 and three T-sections 111, at the ends of the cores from which thirds of the tube have been welded 112.
  • the different wings of the sections 111 are joined by welding and define a space 113 which can be kept available or fill with concrete or even with water.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
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  • Building Environments (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
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Abstract

A fireproof construction element has a plurality of integrally interconnected and parallel profile beams each having a longitudinally extending outer flange defining an outer surface and a longitudinally extending web extending inwardly from the flange. The webs are each formed adjacent the flange with a row of at least generally longitudinally extending, elongated, and laterally throughgoing slots. The beams form a plurality of outwardly open channels laterally bounded by the flanges. Respective masses of concrete substantially fill the channels between the webs and inward of the flanges and have outer surfaces contiguous with the outer surfaces of the beam flanges. The slots can be provided in two rows with the slots of one row overlapping and staggered with the rows of the other row.

Description

L'invention concerne une poutrelle composite constituée essentiellement par des profilés en acier et du béton dont l'intérieur du contour défini par les profilés est rempli par du béton, éventuellement armé, et dont au moins un des profilés a la face externes de ses ailes à découvert. Une telle poutrelle peut notamment être utilisée comme poteau ou support de plancher et présente une excellente résistance au feu.The invention relates to a composite beam essentially consisting of steel profiles and concrete, the interior of the contour defined by the profiles is filled with concrete, possibly reinforced, and at least one of the profiles of which has the external face of its wings. discovered. Such a beam can in particular be used as a post or floor support and has excellent fire resistance.

De telles poutrelles composites résistantes au feu ont par exemple été décrites dans les brevets LU 84 772 et LU 84 966. La masse de remplissage en béton est reliée à l'âme du profilé par des armatures, tels que des treillis, des fers en T ou des goujons à tête. La section du profilé en acier, la section du béton et la section d'armature contribuent selon leurs propriétés mécaniques, qui sont fonction de la température, et leur pourcentage de section, à la transmission des charges. En cas d'incendie, il se produit, à mesure que la température augmente, un déplacement continu de la fonction d'absorption de la charge de la section du profilé en acier à la section du béton armé. Des essais d'incendie en laboratoire ont montré que malgré la haute conductivité thermique de l'acier, de telles poutrelles conservent leur force portante au delà des 90 minutes requises.Such fire-resistant composite beams have for example been described in patents LU 84 772 and LU 84 966. The concrete filling mass is connected to the core of the profile by reinforcements, such as lattices, T-bars. or head studs. The section of the steel profile, the concrete section and the reinforcement section contribute according to their mechanical properties, which are a function of temperature, and their percentage of section, to the transmission of loads. In the event of a fire, as the temperature rises, the load absorption function moves continuously from the section of the steel section to the section of reinforced concrete. Laboratory fire tests have shown that despite the high thermal conductivity of steel, such beams retain their load-bearing capacity beyond the required 90 minutes.

Etant donné que la surface de métal offerte au feu joue un rôle prépondérant dans le processus d'échauffement de telles poutrelles composites et par suite dans la diminution de portance, des structures intéressantes d'un point de vue esthétique, force portante à froid ou facilité de fabrication ne peuvent, où bien pas être employées dans des bâtiments élevés, ou alors doivent être sur- dimensionnées de manière telle que leur prix de revient devient prohibitif.Since the metal surface offered to the fire plays a preponderant role in the heating process of such composite beams and consequently in the reduction of lift, structures that are interesting from an aesthetic point of view, cold load-bearing capacity or ease of manufacture cannot, or else cannot be used in tall buildings, or else must be oversized in such a way that their cost price becomes prohibitive.

Le but de la présente invention est d'éviter cet inconvénient et de proposer une poutrelle composite dont les propriétés à chaud ne sont plus tributaires des surfaces d'acier à découvert et qui laisse toute latitude dans sa conception architecturale.The object of the present invention is to avoid this drawback and to propose a composite beam, the hot properties of which are no longer dependent on the exposed steel surfaces and which leaves all latitude in its architectural design.

Ce but est atteint par la poutrelle selon l'invention telle que caractérisée dans la revendication principale. Des variantes d'exécution préférentielles sont décrites dans les sous-revendications.This object is achieved by the beam according to the invention as characterized in the main claim. Preferential variant embodiments are described in the subclaims.

Un des avantages majeurs de l'invention consiste dans le fait qu'elle permet le contrôle du flux des calories ainsi que leur guidage vers des endroits de la poutrelle dont l'échauffement n'a qu'une influence limitée sur la portance de l'ensemble. De cette façon des poutrelles, qui ont une portance élevée à froid, mais de grandes surfaces d'acier à découvert, gardent une portance acceptable à chaud. Notons qu'on peut profiter des évidements dans les profilés pour positionner un cerclage renforçant le béton.One of the major advantages of the invention consists in the fact that it allows the control of the flow of calories as well as their guiding towards places of the beam whose heating has only a limited influence on the lift of the together. In this way beams, which have a high lift when cold, but large areas of exposed steel, keep an acceptable lift when hot. Note that we can take advantage of the recesses in the profiles to position a hoop reinforcing the concrete.

L'invention sera illustrée à l'aide de figures, qui montrent de façon non-limitative quelques variantes d'exécution. Il est représenté:

  • - en Fig. 1, l'allure des isothermes pour une poutrelle classique ayant une bonne résistance au feu,
  • - en Fig. 2, l'allure des isothermes pour une poutrelle classique offrant une surface métallique élevée au feu;
  • - en Fig. 3, une section droite d'une poutrelle réalisée conformément à l'invention;
  • - en Fig. 4, une coupe à travers la Fig. 3, selon la ligne IV-IV;
  • - en Fig. 5 et 6, des variantes d'évidements;
  • - en Fig. 7 une section droite à travers une variante d'exécution d'une poutrelle;
  • - en Fig. 8, 9, 10, 11 et 12, des sections droites de quelques poutrelles composites à contour polygonal.
The invention will be illustrated with the aid of figures, which show in a non-limiting manner some variant embodiments. He is represented:
  • - in Fig. 1, the appearance of the isotherms for a conventional beam having good fire resistance,
  • - in Fig. 2, the appearance of the isotherms for a conventional beam offering a high metal surface on fire;
  • - in Fig. 3, a cross section of a beam produced in accordance with the invention;
  • - in Fig. 4, a section through FIG. 3, along line IV-IV;
  • - in Fig. 5 and 6, variants of recesses;
  • - in Fig. 7 a cross section through an alternative embodiment of a beam;
  • - in Fig. 8, 9, 10, 11 and 12, cross sections of some composite beams with polygonal outline.

Les Fig. 1 et 2 représentent les isothermes (en degrés Celsius) dans un quart de section droite de deux poutrelles connues, après les avoir exposées au feu pendant 90 minutes. On remarque, à part les profilés à âme large 1 (type HE 650 AA), le remplissage en béton 2. Les deux structures se distinguent par le fait que celle représentée en Fig. 1 comporte une armature 4 ( on a donné aux ronds à béton une section carrée pour des raisons de commodité), alors que la structure représentée en Fig. 2 possède au lieu d'une armature un profilé H (référence 3) soudé à l'âme du profilé 1. En comparant l'allure des isothermes de ces deux poutrelles composites, on constate que la présence du profilé 3, dont une des ailes n'est pas protégée par du béton, a un effet néfaste sur la distribution des températures dans la majeure partie de la section. Bien que le point le plus chaud, situé à l'extrémité de l'aile du profilé 1, a une température qui n'est que légèrement plus élevée pour la variante représentée en Fig. 2 (975 °C resp. 961 °C), la température du point le plus froid, situé à chaque fois dans le béton, ne vaut que 100 °C pour la variante montrée en Fig. 1 alors qu'elle est de 220 °C dans le cas de la Fig. 2. Le fait le plus grave est que la température de la partie centrale de l'âme du profilé est plus de deux fois plus élevée dans le cas de la Fig. 2 (255 °C resp. 117 °C). La présence du profilé 3 réduit, par suite de la surface externe 5 d'une de ses ailes exposée à l'action du feu, dans des proportions inacceptables la résistance au feu de l'ensemble.Figs. 1 and 2 represent the isotherms (in degrees Celsius) in a quarter cross section of two known beams, after having exposed them to fire for 90 minutes. We note, apart from the wide web sections 1 (type HE 650 AA), the concrete filling 2. The two structures are distinguished by the fact that that shown in Fig. 1 comprises a reinforcement 4 (the concrete rods have been given a square section for reasons of convenience), while the structure shown in FIG. 2 has, instead of an armature, a profile H (reference 3) welded to the core of profile 1. By comparing the shape of the isotherms of these two composite beams, it can be seen that the presence of profile 3, including one of the wings is not protected by concrete, has a detrimental effect on the temperature distribution in most of the section. Although the hottest point, located at the end of the wing of profile 1, has a temperature which is only slightly higher for the variant shown in FIG. 2 (975 ° C resp. 961 ° C), the temperature of the coldest point, located each time in the concrete, is only worth 100 ° C for the variant shown in Fig. 1 while it is 220 ° C in the case of FIG. 2. The most serious fact is that the temperature of the central part of the core of the profile is more than twice as high in the case of FIG. 2 (255 ° C resp. 117 ° C). The presence of the section 3 reduces, as a result of the external surface 5 of one of its wings exposed to the action of fire, in unacceptable proportions the fire resistance of the assembly.

La Fig. 3 montre une section droite à travers une poutrelle composite constituée par un profilé 31 à âme de forte hauteur et par deux profilés 33 à âme de faible hauteur dont les ailes sont fixées par soudage à l'âme du profilé 31. L'intérieur du contour octogonal défini par les profilés est rempli par du béton 32. Par suite des grandes surfaces métalliques à découvert, une telle structure a en soi une médiocre résistance au feu. Selon l'invention on prévoit dans l'âme des profilés des évidements 34. Comme on peut le voir sur la Fig. 4, ces évidements 34 ont une forme allongée et sont situés près de l'aile, avoisinant le renflement de métal existant à l'endroit du passage de l'âme à l'aile du profilé. A côté de cette première série d'évidements 34 on peut prévoir une deuxième série d'évidements allongés 44, décalée verticalement (voir Fig. 5).Fig. 3 shows a cross section through a composite beam formed by a profile 31 with a high height core and by two profiles 33 with a low height core, the wings of which are fixed by welding to the core of the profile 31. The inside of the outline octagonal defined by the profiles is filled with concrete 32. As a result of large exposed metal surfaces, such a structure has in itself poor fire resistance. According to the invention, profiles are provided in the core with recesses 34. As can be seen in FIG. 4, these recesses 34 have an elongated shape and are located near the wing, close to the bulge of metal existing at the point of the passage of the core to the wing of the profile. Next to this first series of recesses 34, a second series of elongated recesses 44 can be provided, vertically offset (see FIG. 5).

La longueur 45 d'un tel évidement, réalisé par oxycoupage, est de quelque vingt cm et sa largeur 46 de deux cm. Le flux thermique qui progresse, pour les poutrelles classiques, aisément de la surface exposée vers la partie centrale de l'âme, est freiné par la présence de ces évidements, qu'ils se remplissent de béton lors de la fabrication ou non. Le frein thermique est évidemment plus efficace lorsque le béton ne pénètre pas dans les évidements, ce qui peut être assuré en y logeant du matériau à faible conductivité thermique, comme du styropor. Des poutrelles composites, réalisées conformément aux variantes selon les Fig. 4 et 5jont des résistances au feu qui valent 1,5 fois respectivement le double de celle d'une structure identique, mais sans évidements dans l'âme. Au lieu de choisir des évidements allongés et de les disposer parallèlement à l'aile, on peut leur donner, selon les contraintes de fabrication, toute autre forme et disposition apte à assurer le but recherché. On peut par exemple percer des trous 61 d'un diamètre de deux cm dans l'âme et simplement relier ces trous par oxycoupage (voir Fig. 6), ce qui conduit à une fente 62 de quelques mm de largeur.The length 45 of such a recess, produced by flame cutting, is about twenty cm and its width 46 is two cm. The heat flux which progresses, for conventional beams, easily from the exposed surface towards the central part of the core, is slowed down by the presence of these recesses, whether they fill with concrete during manufacture or not. The thermal brake is obviously more effective when the concrete does not penetrate into the recesses, which can be ensured by housing therein material with low thermal conductivity, such as styropor. Composite beams, produced according to the variants according to Figs. 4 and 5 have fire resistances which are worth 1.5 times respectively twice that of an identical structure, but without recesses in the core. Instead of choosing elongated recesses and placing them parallel to the wing, they can be given, according to manufacturing constraints, any other shape and arrangement capable of ensuring the desired goal. One can for example drill holes 61 with a diameter of two cm in the core and simply connect these holes by flame cutting (see Fig. 6), which leads to a slot 62 a few mm in width.

Il est bien évident que ces évidements, bien qu'améliorant la résistance au feu de la poutrelle composite, affaiblissent sa force portante à froid. Pour remédier à ce désavantage, on peut fixer au voisinage des évidements 34 et côté âme du profilé, des cornières 71, des ronds à béton 72, des fers carrés 73 ou des fers plats 74 (voir Fig. 7). Ces structures auxiliaires métalliques, qui longent le profilé sur la majeure partie de sa hauteur, sont fixées à celui-ci par soudage. Lorsqu'on combine les cornières 71 avec les évidements représentés en Fig. 6, on peut profiter des trous 61 (situés à l'extrême droite de cette figure) pour boulonner la cornière sur l'âme. Les ronds à béton 72 sont solidarisés entre eux et fixés sur l'âme du profilé à l'aide de soudage par points. Les structures auxiliaires n'augmentent pas seulement la force portante à froid et à chaud de la poutrelle composite mais influencent également favorablement à chaud le flux des calories. En effet il y a redistribution de calories de l'âme vers le béton grâce à l'effet d'ailette de refroidissement que jouent ces structures auxiliaires. Cet effet est particulièrement prononcé pour les cornières 71 et les fers plats 74. Les parties métalliques centrales 75 et 76 des profilés 31 et 33 sont donc d'autant moins rechauffées.It is obvious that these recesses, although improving the fire resistance of the composite beam, weaken its bearing force when cold. To remedy this disadvantage, it is possible to fix in the vicinity of the recesses 34 and on the web side of the profile, angles 71, concrete bars 72, square bars 73 or flat bars 74 (see FIG. 7). These metal auxiliary structures, which run along the profile over most of its height, are fixed to it by welding. When the angles 71 are combined with the recesses shown in FIG. 6, we can take advantage of the holes 61 (located at the extreme right of this figure) to bolt the angle iron to the core. The concrete bars 72 are joined together and fixed to the web of the profile using spot welding. Auxiliary structures not only increase cold and hot load-bearing capacity of the composite beam but also favorably influence the heat flow when hot. Indeed, there is redistribution of calories from the core to the concrete thanks to the cooling fin effect that these auxiliary structures play. This effect is particularly pronounced for the angles 71 and the flat irons 74. The central metal parts 75 and 76 of the sections 31 and 33 are therefore all the less heated.

Sur la Fig. 8 a été représentée une poutrelle composite à section rectangulaire, constituée par un profilé 81, à âme de forte hauteur et deux profilés 82, à âme de faible hauteur. Le fait de réaliser dans les âmes, près des ailes visibles, les évidements selon la Fig. 4, procure une augmentation de la résistance au feu de 50 %.In Fig. 8 has been shown a composite beam with rectangular section, constituted by a profile 81, with a high height core and two profiles 82, with a low height core. The fact of making in the souls, near the visible wings, the recesses according to FIG. 4, provides a 50% increase in fire resistance.

La poutrelle composite à section hexagonale, montrée en Fig. 9, est constituée par du béton 32 et un tube central plein 91 auquel ont été soudés, avec un décalage de 120°, trois profilés en T 92. Les évidements 34 procurent à cette poutrelle, en dépit du rapport élevé métal à découvert /métal protégé par le béton, une résistance au feu acceptable. Il est néanmoins conseillé de disposer en outre des cornières 71 ou des fers plats 74 près des évidements 34.The composite beam with hexagonal section, shown in Fig. 9, is constituted by concrete 32 and a solid central tube 91 to which have been welded, with an offset of 120 °, three T-profiles 92. The recesses 34 provide this beam, despite the high exposed metal / metal ratio protected by concrete, acceptable fire resistance. It is nevertheless advisable to additionally have angles 71 or flat irons 74 near the recesses 34.

La poutrelle composite à section hexagonale, montrée en Fig. 10, est constituée par du béton 32 et un profilé à âme de forte hauteur 101, auquel ont été fixés par soudage deux profilés en T 102. Les évidements 34, qui ont également été prévus dans les profilés 102 ne sont, par suite de leur faible surface exposée, pas absolument nécessaires.The composite beam with hexagonal section, shown in Fig. 10, is constituted by concrete 32 and a very high-profile core 101, to which two T-profiles 102 have been fixed by welding. The recesses 34, which have also been provided in the profiles 102 are, as a result of their small exposed area, not absolutely necessary.

La poutrelle composite à section triangulaire et aux coins arrondis, représentée en Fig. 11, est constituée par du béton 32 et trois profilés en T 111, aux extrémités des âmes desquels ont été soudé des tiers de tube 112. Les différentes ailes des profilés 111 sont solidarisées par soudage et définissent un espace 113 qu'on peut garder disponible ou bien remplir par du béton ou même par de l'eau. On distingue en outre des treillis 114, destinés à renforcer le béton en prévenant son éclatement et fixés aux ailes des profilés 111 par des éléments de liaison 115.The composite beam with triangular section and rounded corners, shown in Fig. 11, is made up of concrete 32 and three T-sections 111, at the ends of the cores from which thirds of the tube have been welded 112. The different wings of the sections 111 are joined by welding and define a space 113 which can be kept available or fill with concrete or even with water. There are also 114 mesh, intended to reinforce the concrete. by preventing it from bursting and fixed to the wings of the profiles 111 by connecting elements 115.

En prenant, à la place des profilés en T, aux extrémités des âmes desquels ont été soudés des tiers de tube, trois profilés 120 ayant une section en forme de I, on obtient une poutrelle composite à section hexagonale tel que représentée sur la Fig.12.By taking, in place of the T-profiles, at the ends of the cores from which thirds of the tube were welded, three profiles 120 having an I-shaped section, a composite beam with a hexagonal section is obtained as shown in FIG. 12.

Notons que pour ne pas alourdir les figures on n'a pas représenté dans les autres variantes des éléments d'armature du béton. Ceux-ci peuvent être constitués par des ronds à béton, des treillis, des goujons à tête ou des cerclages passant par les évidements. Pour certaines poutrelles composites (p. ex. celle représentée en Fig.7), comportant des cornières au voisinage de chacune des ailes exposées, il peut s'avérer superflu de prévoir des armatures supplémentaires pour le béton.Note that in order not to weigh down the figures, the other reinforcing elements of the concrete have not been shown in the other variants. These can be made up of concrete rods, trellises, head studs or straps passing through the recesses. For some composite beams (e.g. the one shown in Fig. 7), with angles in the vicinity of each of the exposed wings, it may prove superfluous to provide additional reinforcements for the concrete.

Claims (10)

1. Poutrelle composite, constituée essentiellement par des profilés en acier et du béton, dont l'intérieur du contour défini par les profilés est rempli par du béton, éventuellement armé, et dont au moins un des profilés a la face externe de ses ailes à découvert, caractérisée en ce qu'au moins un des profilés ayant la face externe de ses ailes à découvert comporte sur la majeure partie de sa longueur des évidements allongés, lesdits évidements s'étendant dans la partie de l'âme voisine de l'aile à découvert.1. Composite beam, consisting essentially of steel profiles and concrete, the interior of the outline defined by the profiles is filled with concrete, possibly reinforced, and of which at least one of the profiles has the external face of its wings with uncovered, characterized in that at least one of the sections having the external face of its exposed wings has over the major part of its length elongated recesses, said recesses extending in the part of the core adjacent to the wing discovered. 2. Poutrelle selon la revendication 1, caractérisée en ce que les évidements ont la forme de rectangles oblongs aux bords arrondis.2. Beam according to claim 1, characterized in that the recesses have the shape of oblong rectangles with rounded edges. 3. Poutrelle selon la revendication 1, caractérisée en ce que les évidements sont constitués chacun par deux trous reliés par découpage d'un filet mince de matière située entre eux.3. Beam according to claim 1, characterized in that the recesses each consist of two holes connected by cutting a thin thread of material located between them. 4. Poutrelle selon une des revendications 1-3, caractérisée en ce que les évidements allongés sont sensiblement parallèles à l'aile à découvert du profilé.4. Beam according to one of claims 1-3, characterized in that the elongated recesses are substantially parallel to the exposed wing of the profile. 5. Poutrelle selon une des revendications 1-3, caractérisée en ce que les évidements allongés sont disposés obliquement par rapport à l'aile à découvert du profilé.5. Beam according to one of claims 1-3, characterized in that the elongated recesses are arranged obliquely relative to the exposed wing of the profile. 6. Poutrelle selon les revendications 4 ou 5, caractérisée en ce qu'elle comporte une deuxième série d'évidements, semblable à la première et décalée horizontalement et verticalement par rapport à celle-ci.6. Beam according to claims 4 or 5, characterized in that it comprises a second series of recesses, similar to the first and offset horizontally and vertically relative to the latter. 7. Poutrelle selon une des revendications 1-6, caractérisée en ce qu'un matériau à faible conductivité thermique, tel que de l'air, du Styropor ou du PVC, se trouve dans les évidements.7. Beam according to one of claims 1-6, characterized in that a material with low thermal conductivity, such as air, Styropor or PVC, is located in the recesses. 8. Poutrelle selon une des revendications 1-7, caractérisée en ce qu'elle comporte au moins une structure auxiliaire métallique s'étendant sur la majeure partie de sa longueur, ladite structure auxiliaire étant disposée le long des faces de l'âme au voisinage des évidements et du côté centre de la poutrelle.8. Beam according to one of claims 1-7, characterized in that it comprises at least one metallic auxiliary structure extending over most of its length, said auxiliary structure being arranged along the faces of the core in the vicinity recesses and the center side of the beam. 9. Poutrelle selon la revendication 8, caractérisée en ce que la structure auxiliaire est constituée par des ronds à béton, des cornières, des fers plats ou des fers carrés.9. Beam according to claim 8, characterized in that the auxiliary structure consists of concrete rods, angles, flat irons or square irons. 10. Poutrelle selon une des revendications 1-9, caractérisée en ce que les profilés la composant ainsi que la structure auxiliaire sont soit soudés, soit boulonnés partiellement ou totalement ensemble.10. Beam according to one of claims 1-9, characterized in that the sections making it up as well as the auxiliary structure are either welded, or partially or totally bolted together.
EP86111326A 1985-08-30 1986-08-16 Composite beam Expired - Lifetime EP0212593B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86111326T ATE62307T1 (en) 1985-08-30 1986-08-16 COMPOSITE CARRIER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU86063 1985-08-30
LU86063A LU86063A1 (en) 1985-08-30 1985-08-30 COMPOSITE BEAM

Publications (3)

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EP0212593A2 true EP0212593A2 (en) 1987-03-04
EP0212593A3 EP0212593A3 (en) 1989-03-15
EP0212593B1 EP0212593B1 (en) 1991-04-03

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US (1) US4779395A (en)
EP (1) EP0212593B1 (en)
AT (1) ATE62307T1 (en)
CA (1) CA1303380C (en)
DE (1) DE3678510D1 (en)
LU (1) LU86063A1 (en)

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JP3899866B2 (en) * 2001-08-07 2007-03-28 鹿島建設株式会社 Joint structure of steel plate concrete structure
US7721496B2 (en) 2004-08-02 2010-05-25 Tac Technologies, Llc Composite decking material and methods associated with the same
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US7930866B2 (en) 2004-08-02 2011-04-26 Tac Technologies, Llc Engineered structural members and methods for constructing same
CN101031696B (en) 2004-08-02 2010-05-05 Tac科技有限责任公司 Engineered structural members and methods for constructing same
CA2502346A1 (en) * 2005-03-24 2006-09-24 Royal Group Technologies Limited Fire barrier component
US8484915B1 (en) 2012-07-11 2013-07-16 King Saud University System for improving fire endurance of concrete-filled steel tubular columns
US9677273B2 (en) 2014-11-26 2017-06-13 King Saud University Concrete-filled steel tubular column for high load carrying capacity and fire resistance
RU179751U1 (en) * 2017-07-26 2018-05-23 Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный архитектурно-строительный университет" КГАСУ STABILITY CONCRETE STAND
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Also Published As

Publication number Publication date
ATE62307T1 (en) 1991-04-15
DE3678510D1 (en) 1991-05-08
CA1303380C (en) 1992-06-16
EP0212593A3 (en) 1989-03-15
LU86063A1 (en) 1987-03-06
US4779395A (en) 1988-10-25
EP0212593B1 (en) 1991-04-03

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