EP0215148B1 - Connecting means for a composite concrete supporting construction - Google Patents

Connecting means for a composite concrete supporting construction Download PDF

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Publication number
EP0215148B1
EP0215148B1 EP85111721A EP85111721A EP0215148B1 EP 0215148 B1 EP0215148 B1 EP 0215148B1 EP 85111721 A EP85111721 A EP 85111721A EP 85111721 A EP85111721 A EP 85111721A EP 0215148 B1 EP0215148 B1 EP 0215148B1
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Prior art keywords
concrete
holes
slab
concrete slab
bars
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German (de)
French (fr)
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EP0215148A1 (en
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Wolfhart Dr.-Ing. Andrä
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Priority to AT85111721T priority Critical patent/ATE59685T1/en
Priority to EP85111721A priority patent/EP0215148B1/en
Priority to DE8585111721T priority patent/DE3581080D1/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
    • 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
    • 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

Definitions

  • Composite means for transmitting forces between the steel girder and the concrete slab in the case of composite girder structures consisting of steel, longitudinally welded to the girder of the girder and engage in the concrete of the slab are known, e.g. from US-A-3736 716.
  • composite materials made of flat bars with a rectangular cross-section, which are provided on one side with transverse ribs at close intervals and rest on the belt of the steel beam with the other, smooth side and are connected to this by fillet welds.
  • the welded flat bar creates a toothing in the contact surface between the concrete slab and the steel belt, through which shear forces can be transmitted in the longitudinal direction of the beam.
  • shear forces can be transmitted in the longitudinal direction of the beam.
  • lifting the slab additional reinforcement loops or headed dowels running in the direction of the slab thickness are required, which are welded onto the belt or flat bar and anchored in the concrete slab.
  • Head bolt dowels can also be anchored in a corresponding manner.
  • the transmission of the shear force takes place here by toothing, the concrete teeth engaging in the web holes of the U-profile from above.
  • larger aggregate grains can also sit in the center of the hole in front of the U-bar, which increases the shear strength in the horizontal shear surface in the upper edge of the U-bar.
  • the dowels or loops can only be installed at the construction site without welding and in a simple manner, they are still used by specially trained, i.e. reinforcement elements provided with thickening. Furthermore, the web parts of the U-profile that remain between the holes are subjected to bending in the vertical direction by anchoring the dowels or loops, which locally leads to larger hole spacings. In addition, it must be ensured that when concreting the slab, the cavity enclosed by the U-profile is properly filled with concrete. The disadvantage here is that dirt or water can easily accumulate in the cavity, which makes it difficult to produce perfect concrete quality in this highly stressed area. (The same naturally also applies to the concrete in the perforated area of the flat bar).
  • the invention is therefore based on the object to achieve the anchoring of the concrete slab without special loops or dowels and to increase the load-bearing capacity of the profiled bars as a compound and thus to make better use of them in economic and constructive terms.
  • the cross-sectional parts of the profile bars which generally protrude at right angles from the carrier belt, are provided with through holes at close intervals, the clear width of which is greater than the diameter of the largest grain of the concrete, and through the holes there is an existing concrete plate from the concrete Concrete dowel even more so.
  • the generally perpendicular, perforated cross-sectional parts also prevent the accumulation of dirt or water in the perforated area and ensure the production of perfect concrete at this point.
  • a very significant advantage of the design or arrangement of the profiled bars according to the invention is that shear forces can be transmitted in any direction via the concrete which penetrates through the holes in the profiled bar in a dowel manner, i.e. So also at right angles to the level of the belt surface so that the concrete slab is prevented from lifting from the steel belt from the outset.
  • FIGS. 1 to 4 The various design forms of the profile strips and the associated design options for producing the bond between the steel girder and the concrete slab are explained by way of example in the following FIGS. 1 to 4. Vertical sections through the bonded area are shown here at right angles to the beam span or, in the case of FIGS. 1b and 4b, also in the direction of the beam span.
  • Fig. 1 shows a profile bar 2 with a rectangular cross-section, which is welded with its narrow side by 2 fillet welds 4 in the longitudinal direction on the carrier belt 1.
  • the profile bar 2 (flat bar) has holes 3 in its cross-section part projecting from the belt at close intervals, as can be seen from FIG. 1b.
  • Bars of the lower transverse reinforcement of the reinforced concrete plate 6 are inserted through some of these holes, whereby the load-bearing capacity of the dowel is significantly increased.
  • a U-profile with flanges 7 projecting from the belt is welded onto the carrier belt 1 with the aid of the two fillet welds 4.
  • Holes 3 are made at close intervals in both flanges 7. This gives a multi-section dowel between the concrete slab and the carrier belt.
  • bow-like reinforcement bars 8 are inserted, which are anchored in the steel plate 6.
  • short steel bolts 5 can also be inserted through the holes, which fill the entire hole cross section and can be hooked into the stirrup-like reinforcing bars running in the longitudinal direction.
  • T-section is shown as a profile bar, which is welded with its flange on both sides by fillet welds 4 on the carrier belt and holes 3 are provided in the projecting web at close intervals.
  • T-profiles can be of advantage if the profile is deformed along the weld seams, e.g. can be avoided by punching holes.
  • the plate reinforcement is placed on the protruding web of the T-profile from above, so it does not engage in the holes.
  • the concrete slab is anchored to the belt by means of the dowel effect of the concrete in the perforated area by simple thin reinforcement bars 8 which are hooked into a part of the holes and perforated bars are used.
  • FIG. 4 again shows a profile bar 2 with a rectangular cross-section.
  • the large holes 3 which may be round or rectangular, smaller additional holes 9 are arranged. Through these smaller holes rods 5.
  • the reinforcement bars of the transverse slab reinforcement are pushed through and held at the height required for the concrete cover.
  • the bond is made on the one hand by the concrete dowels in the perforated area, and on the other hand by hook-like reinforcement bars that encompass the transverse reinforcement of the slab.

Abstract

The sectional bars (2) are welded to the girder chord (1) in the longitudinal direction and engage into the concrete of the slab (6). The parts of the sectional bars (2) generally projecting at right angles from the girder chord (1) are provided with continuous holes (3) at narrow intervals. The concrete passing through the holes (3) in a dowel-like manner makes two-shear shear connections between the concrete slab (6) and sectional bar (2), via which shearing forces can be transmitted in any direction in the girder plane. This prevents the concrete slab from being lifted off, so that, in principle, no special loops or dowels are needed for the tension-resistant connection between the girder chord (2) and concrete slab (6). The effect of the horizontal concrete dowels can be increased by means of bolts and/or reinforcing bars (5) which are inserted through the holes (3). <IMAGE>

Description

Verbundmittel zur Übertragung von Kräften zwischen Stahlträger und Betonplatte bei Verbundtragwerken, die aus stählernen, in Längsrichtung auf den Gurt des Trägers aufgeschweissten Profilstäben bestehen und in den Beton der Platte eingreifen sind bekannt, z.B. aus der US-A-3736 716.Composite means for transmitting forces between the steel girder and the concrete slab in the case of composite girder structures consisting of steel, longitudinally welded to the girder of the girder and engage in the concrete of the slab are known, e.g. from US-A-3736 716.

Bekannt sind auch Verbundmittel aus Flachstäben mit Rechteck-Querschnitt, die auf einer Seite mit Querrippen in engen Abständen versehen sind und mit der anderen, glatten Seite auf dem Gurt des Stahlträgers aufliegen und mit diesem durch Kehlnähte verbunden sind.Also known are composite materials made of flat bars with a rectangular cross-section, which are provided on one side with transverse ribs at close intervals and rest on the belt of the steel beam with the other, smooth side and are connected to this by fillet welds.

Bekannt ist auch, bei Flachstäben anstelle der Querrippen Löcher in engen Abständen anzuordnen.It is also known to arrange holes at flat intervals instead of the transverse ribs in flat bars.

In beiden Fällen wird durch den aufgeschweissten Flachstab eine Verzahnung in der Kontaktfläche zwischen Betonplatte und Stahlgurt hergestellt, durch die Scherkräfte in Trägerlängsrichtung übertragen werden können. Zur Übertragung von rechtwinklig hierzu verlaufenden, die Platte abhebenden Kräften werden zusätzlich in Richtung der Plattendicke verlaufende Bewehrungsschlaufen oder Kopfbolzendübel benötigt, die auf dem Gurt bzw. dem Flachstab angeschweisst und in der Betonplatte verankert sind.In both cases, the welded flat bar creates a toothing in the contact surface between the concrete slab and the steel belt, through which shear forces can be transmitted in the longitudinal direction of the beam. For the transmission of forces at right angles to this, lifting the slab, additional reinforcement loops or headed dowels running in the direction of the slab thickness are required, which are welded onto the belt or flat bar and anchored in the concrete slab.

Diese Schlaufen oder Bolzen sind beim Transport der Stahlträger oft hinderlich oder setzen - wenn sie erst auf der Baustelle angeschweisst werden - hierfür besondere Massnahmen voraus, die sich preislich ungünstig auswirken.These loops or bolts are often a hindrance when transporting the steel girders or - if they are only welded on at the construction site - require special measures that have an unfavorable price.

Aus diesem Grunde wurde schon vorgeschlagen, Stäbe mit U-Querschnitt zu verwenden, diese mit ihren beiden Flanschenden durch Kehlnähte an den Trägergurt anzuschliessen und den Steg des U-Querschnittes mit Löchern in engen Abständen zu versehen. In diese Löcher können an der Baustelle in den statisch erforderlichen Abständen von oben her bügelartige Bewehrungselemente gesteckt werden, die mit verdickten Enden versehen sind und nach dem Betonieren in dem vom U-Profil umschlossenen Betonkern verankert sind.For this reason, it has already been proposed to use rods with a U-cross section, to connect them with their two flange ends to the support belt by fillet welds, and to provide the web of the U-cross section with holes at close intervals. In these holes, at the construction site, stirrup-like reinforcement elements can be inserted from above at the statically required intervals, which are provided with thickened ends and, after concreting, are anchored in the concrete core enclosed by the U-profile.

In entsprechender Weise können auch Kopfbolzen-Dübel verankert werden.Head bolt dowels can also be anchored in a corresponding manner.

Die Übertragung der Scherkraft erfolgt hier durch Verzahnung, wobei die Betonzähne von oben in die Steglöcher des U-Profils eingreifen. Vorteilhaft ist hier im Vergleich zum gelochten Flachstahlprofil, dass sich auch grössere Zuschlagkörner im Lochbereich mittig vor den U-Steg setzen können, wodurch die Scherfestigkeit in der horizontalen Abscherfläche in Oberkante U-Steg erhöht wird.The transmission of the shear force takes place here by toothing, the concrete teeth engaging in the web holes of the U-profile from above. Compared to the perforated flat steel profile, it is advantageous here that larger aggregate grains can also sit in the center of the hole in front of the U-bar, which increases the shear strength in the horizontal shear surface in the upper edge of the U-bar.

Obwohl bei dieser Lösung die Dübel bzw. Schlaufen ohne Schweissung und auf einfache Weise erst an der Baustelle eingebaut werden können, so setzt sie doch besonders ausgebildete, d.h. mit Verdickungen versehene Bewehrungselemente voraus. Weiter werden die zwischen den Löchern stehengebliebenen Stegteile des U-Profils durch die Verankerung der Dübel bzw. Schlaufen in vertikaler Richtung auf Biegung beansprucht, was örtlich zu grösseren Lochabständen führt. Darüberhinaus muss sichergestellt sein, dass beim Betonieren der Platte der durch das U-Profil umschlossene Hohlraum einwandfrei mit Beton verfüllt ist. Hier wirkt sich nachteilig aus, dass sich im Hohlraum leicht Schmutz oder Wasser ansammeln kann, was die Herstellung einer einwandfreien Betonqualität in diesem hoch beanspruchten Bereich erschwert. (Das gleiche gilt natürlich auch für den Beton im Lochbereich des Flachstabes).Although with this solution the dowels or loops can only be installed at the construction site without welding and in a simple manner, they are still used by specially trained, i.e. reinforcement elements provided with thickening. Furthermore, the web parts of the U-profile that remain between the holes are subjected to bending in the vertical direction by anchoring the dowels or loops, which locally leads to larger hole spacings. In addition, it must be ensured that when concreting the slab, the cavity enclosed by the U-profile is properly filled with concrete. The disadvantage here is that dirt or water can easily accumulate in the cavity, which makes it difficult to produce perfect concrete quality in this highly stressed area. (The same naturally also applies to the concrete in the perforated area of the flat bar).

Berücksichtigt man noch die durch das gelochte U-Profil gegenüber dem gelochten Flachstab bedingten Material-Mehrkosten, so ist durch diese Lösung keine wesentlich ins Gewicht fallende Einsparung zu erzielen.If one also takes into account the additional material costs caused by the perforated U-profile compared to the perforated flat bar, this solution does not result in any significant savings.

Der Erfindung liegt daher die Aufgabe zugrunde, die Verankerung der Betonplatte ohne besondere Schlaufen oder Dübel zu erreichen und die Tragfähigkeit der Profilstäbe als Verbundmittel zu erhöhen und sie damit in wirtschaftlicher und in konstruktiver Hinsicht besser auszunutzen.The invention is therefore based on the object to achieve the anchoring of the concrete slab without special loops or dowels and to increase the load-bearing capacity of the profiled bars as a compound and thus to make better use of them in economic and constructive terms.

Die Lösung besteht darin, dass die vom Trägergurt im allgemeinen rechtwinkelig abstehenden Querschnittsteile der Profilstäbe mit durchgehenden Löchern in engen Abständen versehen sind, deren lichte Weite grösser als der Durchmesser des Grösstkornes des Betons ist und sich durch die Löcher jeweils ein aus dem Beton deu Betonplatte bestehender Betondükel erstrecht. Dies bedeutet, daß durch den Beton im Lochbereich in horizontaler Richtung zweischnittige, dübelartige Verbindungen zwischen Betonplatte und Profilstab ausgebildet sind. Anstelle der bisher waagrechten Scherflächen zwischen Beton und Profilstab bzw. Trägergurt verlaufen die Scherflächen also lotrecht. Damit können bei gleichem Lochquerschnitt und durchgehenden Löchern doppelt so hohe Scherkräfte übertragen werden, da die dübelartigen Verbindungen zwischen Betonplatte und Profilstab zweischnittig ausgenutzt werden können.The solution is that the cross-sectional parts of the profile bars, which generally protrude at right angles from the carrier belt, are provided with through holes at close intervals, the clear width of which is greater than the diameter of the largest grain of the concrete, and through the holes there is an existing concrete plate from the concrete Concrete dowel even more so. This means that two-section, dowel-like connections between the concrete slab and profile bar are formed in the horizontal direction by the concrete in the hole area. Instead of the previously horizontal shear surfaces between the concrete and the profile bar or carrier belt, the shear surfaces run perpendicular. With the same hole cross-section and through holes twice as high shear forces can be transmitted, since the dowel-like connections between the concrete slab and profile bar can be used in two sections.

Durch die im allgemeinen lotrecht stehenden, mit Löchern versehenen Querschnittsteile ist darüberhinaus die Ansammlung von Schmutz oder Wasser im Lochbereich vermieden und die Herstellung eines einwandfreien Betons an dieser Stelle sichergestellt.The generally perpendicular, perforated cross-sectional parts also prevent the accumulation of dirt or water in the perforated area and ensure the production of perfect concrete at this point.

Ein ganz wesentlicher Vorteil der erfindungsgemässen Ausbildung bzw. Anordnung der Profilstäbe besteht jedoch darin, dass über den die Löcher im Profilstab dübelartig durchsetzenden Beton Scherkräfte in beliebiger Richtung übertragen werden können, d.h. also auch rechtwinklig zur Ebene der Gurtfläche so dass damit von vornherein ein Abheben der Betonplatte vom Stahlgurt verhindert wird. _A very significant advantage of the design or arrangement of the profiled bars according to the invention, however, is that shear forces can be transmitted in any direction via the concrete which penetrates through the holes in the profiled bar in a dowel manner, i.e. So also at right angles to the level of the belt surface so that the concrete slab is prevented from lifting from the steel belt from the outset. _

Es sind damit keine Schlaufen oder Dübel zur zugfesten Verbindung zwischen Stahlgurt und Betonplatte erforderlich, sofern die Zugbzw. Scherfestigkeit des Betons im Lochbereich nicht überschritten wird.There are no loops or dowels required for the tensile connection between the steel belt and the concrete slab, provided that the tension or. The shear strength of the concrete in the hole area is not exceeded.

Darüberhinaus besteht die Möglichkeit, die quer zur Trägerspannrichtung verlaufende untere Plattenbewehrung ganz oder teilweise durch die Löcher hindurch zu führen und damit die Wirkung der horizontalen Betondübel wesentlich zu erhöhen.In addition, there is the possibility of the lower one running transversely to the beam clamping direction Lead plate reinforcement completely or partially through the holes and thus significantly increase the effect of the horizontal concrete dowels.

Weiter kann mit Hilfe von dicken stählernen Bolzen, die durch einzelne Löcher hindurch gesteckt sind, die Kraftübertragung zwischen Gurt und Platte im Lochbereich praktisch unbegrenzt vergrössert werden. Damit ergibt sich auch die Möglichkeit, die untere Plattenquerbewehrung von oben auf die Profilstäbe aufzulegen und sich damit der jeweils erforderlichen Betondeckung der Platte ausserhalb des Stahlgurtes anzupassen.Furthermore, with the help of thick steel bolts that are inserted through individual holes, the force transmission between the belt and the plate in the hole area can be increased practically indefinitely. This also makes it possible to place the lower transverse reinforcement on the profile bars from above and thus to adapt to the required concrete cover of the slab outside the steel belt.

Die verschiedenen Ausbildungsformen der Profilleisten und die damit verbundenen konstruktiven Möglichkeiten zur Herstellung des Verbundes zwischen Stahlträger und Betonplatte werden in den folgenden Figuren 1 bis 4 beispielhaft erläutert. Hier sind jeweils Vertikalschnitte durch den Verbundbereich rechtwinklig zur Trägerspannweite bzw. bei Figur 1b und 4b auch in Richtung der Trägerspannweite dargestellt.The various design forms of the profile strips and the associated design options for producing the bond between the steel girder and the concrete slab are explained by way of example in the following FIGS. 1 to 4. Vertical sections through the bonded area are shown here at right angles to the beam span or, in the case of FIGS. 1b and 4b, also in the direction of the beam span.

Fig. 1 zeigt einen Profilstab 2 mit Rechteck-Querschnitt, der mit seiner Schmalseite durch 2 Kehlnähte 4 in Längsrichtung auf den Trägergurt 1 aufgeschweisst ist. Der Profilstab 2 (Flachstab) weist in seinem vom Gurt abstehenden Querschnittsteil Löcher 3 in engen Abständen auf, wie aus Fig.1 b hervorgeht.Fig. 1 shows a profile bar 2 with a rectangular cross-section, which is welded with its narrow side by 2 fillet welds 4 in the longitudinal direction on the carrier belt 1. The profile bar 2 (flat bar) has holes 3 in its cross-section part projecting from the belt at close intervals, as can be seen from FIG. 1b.

Durch einige dieser Löcher sind Stäbe der unteren Querbewehrung der Stahlbetonplatte 6 hindurchgesteckt, wodurch die Tragfähigkeit des Dübels wesentlich erhöht wird.Bars of the lower transverse reinforcement of the reinforced concrete plate 6 are inserted through some of these holes, whereby the load-bearing capacity of the dowel is significantly increased.

In Fig. 2 ist auf den Trägergurt 1 ein U-Profil mit vom Gurt abstehenden Flanschen 7 mit Hilfe der beiden Kehlnähte 4 angeschweisst. In beiden Flanschen 7 sind Löcher 3 in engen Abständen angebracht. Man erhält damit eine vietschnittige Verdübelung zwischen Betonplatte und Trägergurt. Durch einige der einander gegenüberliegende Löcher sind bügelartige Bewehrungsstäbe 8 hindurchgesteckt, die in der Stahlplatte 6 verankert sind. Es können aber auch, wie gestrichelt eingezeichnet ist, kurze Stahlbolzen 5 durch die Löcher hindurch gesteckt werden, die den ganzen Lochquerschnitt ausfüllen und in die in Längsrichtung verlaufende bügelartige Bewehrungsstäbe eingehängt werden können.In Fig. 2, a U-profile with flanges 7 projecting from the belt is welded onto the carrier belt 1 with the aid of the two fillet welds 4. Holes 3 are made at close intervals in both flanges 7. This gives a multi-section dowel between the concrete slab and the carrier belt. Through some of the holes opposite each other bow-like reinforcement bars 8 are inserted, which are anchored in the steel plate 6. However, as shown in dashed lines, short steel bolts 5 can also be inserted through the holes, which fill the entire hole cross section and can be hooked into the stirrup-like reinforcing bars running in the longitudinal direction.

In Fig. 3 ist als Profilstab ein T-Querschnitt dargestellt, der mit seinem Flansch beidseitig durch Kehlnähte 4 auf den Trägergurt aufgeschweisst ist und in dessen abstehenden Steg Löcher 3 in engen Abständen vorgesehen sind. T-Profile können von Vorteil sein, wenn Verformungen des Profils längs der Schweissnähte, die z.B. durch das Stanzen von Löchern entstehen können, vermieden werden sollen.In Fig. 3 a T-section is shown as a profile bar, which is welded with its flange on both sides by fillet welds 4 on the carrier belt and holes 3 are provided in the projecting web at close intervals. T-profiles can be of advantage if the profile is deformed along the weld seams, e.g. can be avoided by punching holes.

Die Plattenbewehrung ist von oben auf den abstehenden Steg des T-Profils aufgelegt, greift also in die Löcher nicht ein. Die Verankerung der Betonplatte mit dem Gurt erfolgt ausser durch die Dübelwirkung des Betons im Lochbereich durch einfache, in einen Teil der Löcher eingehängte beiderseits mit Haken versehene, dünne Bewehrungsstäbe 8. In entsprechender Weise können natürlich auch I-Profile oder T-Profile mit obenliegendem Flansch und jeweils gelochten Stegen verwendet werden.The plate reinforcement is placed on the protruding web of the T-profile from above, so it does not engage in the holes. The concrete slab is anchored to the belt by means of the dowel effect of the concrete in the perforated area by simple thin reinforcement bars 8 which are hooked into a part of the holes and perforated bars are used.

In Fig. 4 ist nochmals ein Profilstab 2 mit Rechteck-Querschnitt dargestellt. Wie im Längsschnitt Fig. 4b zu erkennen sind ausser den grossen Löchern 3 die rund oder auch rechteckig sein können, kleinere Zusatzlöcher 9 angeordnet. Durch diese kleineren Löcher können Stäbe 5. z.B. die Bewehrungsstäbe der Plattenquerbewehrung hindurchgeschoben und in der für die Betondekkung erforderlichen Höhenlage gehaltenwerden. Der Verbund erfolgt auch hier wieder einerseits durch die Betondübel im Lochbereich, andererseits durch hakenartige Bewehrungsstäbe, die die Querbewehrung der Platte umfassen.4 again shows a profile bar 2 with a rectangular cross-section. As can be seen in the longitudinal section in FIG. 4b, in addition to the large holes 3, which may be round or rectangular, smaller additional holes 9 are arranged. Through these smaller holes rods 5. the reinforcement bars of the transverse slab reinforcement are pushed through and held at the height required for the concrete cover. Here, too, the bond is made on the one hand by the concrete dowels in the perforated area, and on the other hand by hook-like reinforcement bars that encompass the transverse reinforcement of the slab.

Die wirtschaftlichen und konstruktiven Vorteile von Profilstäben als Verbundmittel in den hier dargestellten, erfindungsgemässen Anwendungsbeispielen liegen auf der Hand. Es können durch die zweischnittigen dübelartigen Verbindungen Verbundkräfte in beliebigen, in der Trägerebene liegenden Richtungen übertragen werden. Durch die sowieso vorhandene Querbewehrung der Platte wird die Verdübelungswirkung im Lochbereich der Stege erheblich vergrössert. Zusätzliche Verankerungen der Platte am Gurt sind, wenn überhaupt erforderlich, durch im Betonbau übliche Haken oder Bügel ohne Schweissverbindungen möglich. Das Einbringen des Betons in den Lochbereich bringt keinerlei Probleme Hinzu kommt, dass die erfindungsgemässe Lösung zur Übertragung der Verbundkräfte allen Anforderungen hinsichtlich der Duktilität im Bruchzustand durch Variation der Lochgrössen und Lochabstände gerecht wird.The economic and constructive advantages of profile bars as composite means in the application examples according to the invention shown here are obvious. Due to the two-section dowel-like connections, composite forces can be transmitted in any direction lying in the support plane. Due to the existing transverse reinforcement of the slab, the pegging effect in the hole area of the webs is considerably increased. Additional anchorings of the plate to the belt are possible, if necessary at all, by means of hooks or brackets, which are common in concrete construction, without welding connections. The introduction of the concrete into the hole area does not cause any problems. In addition, the solution according to the invention for transmitting the bond forces satisfies all the requirements regarding ductility in the fractured state by varying the hole sizes and hole spacing.

Claims (2)

1. Composite concrete supporting construction, consisting of a concrete slab (6) and a steel support arranged beneath it, onto the top support flange of which, as a means of connection, at least one profiled bar (2) running lengthwise is welded, which has at least one cross-sectional part which is provided with several holes (3) passing through it, which stands perpendicularly off the top support flange and engages in the concrete slab (6), characterised in that, in each case, a concrete dowel consisting of the concrete of the concrete slab (6) extends through the holes (3) and that the holes (3) are arranged at close intervals and their open width is greater than the diameter of the maximum grain of the concrete of the concrete slab (6).
2. Composite concrete supporting construction according to Claim 1, characterised in that the profiled bar is a U-profile, both flanges (7) of which form the cross-sectional parts provided with the holes (3) which engage in the concrete slab (6).
EP85111721A 1985-09-17 1985-09-17 Connecting means for a composite concrete supporting construction Expired - Lifetime EP0215148B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT85111721T ATE59685T1 (en) 1985-09-17 1985-09-17 JOINTS FOR REINFORCED CONCRETE COMPOSITE STRUCTURES.
EP85111721A EP0215148B1 (en) 1985-09-17 1985-09-17 Connecting means for a composite concrete supporting construction
DE8585111721T DE3581080D1 (en) 1985-09-17 1985-09-17 COMPOSITES FOR REINFORCED CONCRETE STRUCTURES.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85111721A EP0215148B1 (en) 1985-09-17 1985-09-17 Connecting means for a composite concrete supporting construction

Publications (2)

Publication Number Publication Date
EP0215148A1 EP0215148A1 (en) 1987-03-25
EP0215148B1 true EP0215148B1 (en) 1991-01-02

Family

ID=8193771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85111721A Expired - Lifetime EP0215148B1 (en) 1985-09-17 1985-09-17 Connecting means for a composite concrete supporting construction

Country Status (3)

Country Link
EP (1) EP0215148B1 (en)
AT (1) ATE59685T1 (en)
DE (1) DE3581080D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008139029A1 (en) * 2007-05-16 2008-11-20 Rautaruukki Oyj Composite beam structure

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3909849A1 (en) * 1988-06-07 1989-12-14 Andrae Hans Peter REINFORCED CONCRETE CARRIER WITH PANEL CROSS SECTION
CA2003060A1 (en) * 1988-11-16 1990-05-16 Pierre Trouillet Process for uniting a mass of material to a functional support, and device thus made
FR2736667B1 (en) * 1995-07-13 1997-08-14 Est Centre Tech Equip DEVICE FOR CONNECTING THE CORE OF A METAL PROFILE TO CONCRETE IN A MIXED CONSTRUCTION
DE29615019U1 (en) * 1996-08-29 1996-12-05 Rojek Richard Prof Dr Ing Device for the concentrated application of force in concrete
BR102018069922A2 (en) * 2018-09-27 2020-04-07 Prates Aguiar Otavio spiral steel component by helical reinforcement bar for composition of elements and mixed connections

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1922340A (en) * 1930-09-22 1933-08-15 Leonie S Young Concrete construction
DE821215C (en) * 1949-12-13 1951-11-15 Bergbau Und Huettenbedarf Ag F Shear protection for composite beams
US3736716A (en) * 1970-04-11 1973-06-05 Long Span Bridge Consultants I Means for reducing slippage of steel beam relative to concrete slab

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008139029A1 (en) * 2007-05-16 2008-11-20 Rautaruukki Oyj Composite beam structure

Also Published As

Publication number Publication date
DE3581080D1 (en) 1991-02-07
EP0215148A1 (en) 1987-03-25
ATE59685T1 (en) 1991-01-15

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