EP0283383A1 - Bridge with girders linked by corrugated sheets - Google Patents

Bridge with girders linked by corrugated sheets Download PDF

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Publication number
EP0283383A1
EP0283383A1 EP88400552A EP88400552A EP0283383A1 EP 0283383 A1 EP0283383 A1 EP 0283383A1 EP 88400552 A EP88400552 A EP 88400552A EP 88400552 A EP88400552 A EP 88400552A EP 0283383 A1 EP0283383 A1 EP 0283383A1
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EP
European Patent Office
Prior art keywords
bridge
sheets
concrete
pleated
continuous
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.)
Granted
Application number
EP88400552A
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German (de)
French (fr)
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EP0283383B1 (en
Inventor
René Thivans
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Campenon Bernard campenon Bernard campenon Bernard
Vinci Construction Grands Projets SAS
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Campenon Bernard BTP
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Priority to AT88400552T priority Critical patent/ATE59867T1/en
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/02—Bridges characterised by the cross-section of their bearing spanning structure of the I-girder type
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
    • 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
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/20—Concrete, stone or stone-like material
    • E01D2101/24—Concrete
    • E01D2101/26—Concrete reinforced
    • E01D2101/268—Composite concrete-metal

Definitions

  • the present invention relates to a bridge comprising at least one upper member in concrete and one lower member in concrete or metal connected to each other by structural elements resistant to shearing forces.
  • the two members of the bridge transmit the moments, while the structural elements or webs arranged between these members transmit the shearing forces.
  • the cores are constituted by a series of bars arranged according to an N. Some of these bars work in compression and others in traction.
  • the members and the webs can be made of concrete and / or steel.
  • the cores arranged between the frames are constituted by elements made of pleated sheets. These pleated sheets are discontinuous, that is to say separated from each other along the length of the bridge.
  • the object of the present invention is to create a bridge which withstands very large cutting forces, while being of light construction and easy to implement.
  • the bridge comprising at least one upper concrete member and one lower concrete or metal member connected to one another by structural elements resistant to shearing forces is characterized in that these structural elements comprise two continuous steel sheets, pleated or corrugated, arranged on either side of a vertical median plane of the bridge, the folds or corrugations extending in a direction substantially perpendicular to the length from the bridge.
  • the invention makes it possible to produce a bridge capable of withstanding significant shearing forces by using light pleated sheets which are therefore easy to implement.
  • the continuous sheets comprise two series of flat strips located in two parallel planes, the strips of one of the series being connected to the strips of the other series by flat strips forming an angle with the latter, the junction between the strips being constituted by an edge.
  • This structure gives the pleated sheet excellent resistance to shearing forces, even when this sheet has a thickness reduced to a few mm.
  • the thickness of the sheets is between 8 and 12 mm
  • the amplitude of the folds is between 10 and 30 cm
  • the size of the sheets measured in the direction of these folds is between 2 and 12 m.
  • the bridge according to the invention comprises an upper chord constituted by a concrete slab 1 and a lower chord formed by a concrete beam 2 connected to the slab 1 by two steel sheets 3, 4 continuous and pleated arranged on either side of a vertical median plane P of the bridge, the folds or undulations extending in a direction substantially perpendicular to the length of the bridge.
  • the assembly constituted by the slab 1, the beam 2 and the pleated sheets 3, 4 rests on concrete pillars 5 by means of lateral studs 6 extending between the slab 1 and the beam 2.
  • the continuous sheets 3, 4 each comprise two series of flat strips 7, 8 situated in two parallel planes, the strips 7 of one of the series being connected to the strips of the other series by flat bands 9 forming an angle a (equal to 37 ° in the example shown) with the latter, the junction between the bands being constituted by an edge.
  • the thickness of the sheets 3, 4 can vary between 8 and 12 mm
  • the amplitude A of the folds 7, 9; 9, 8 can vary between 10 and 30cm and the size of the sheets measured in the longitudinal direction of these folds can vary between 2 and 12 m.
  • the width of the strips 7, 8, 9 can vary between 0.25 and 0.50 m.
  • the assembly constituted by the slab 1, the two pleated sheets 3, 4 and the lower beam 2 forms a tubular structure of constant triangular section. Since the pleated sheets 3, 4 are continuous, the lateral surface of the above-mentioned assembly is completely closed.
  • the upper and lower members are formed by concrete slabs 10, 11. These are connected to each other by two pleated sheets 3, 4 identical to those of the embodiment according to FIG. 1.
  • each pleated sheet 3, 4 has at each of its edges adjacent to the slabs 10, 11 a plate 12, 13 perpendicular to the general plane of the sheet 3, 4 and projecting from both sides. other of this plan.
  • These plates 12, 13 comprise on their face facing outwards, a series of metal connectors 14 embedded in the concrete of the slabs 10, 11.
  • the sheets 3, 4 are firmly anchored to the slabs 10, 11.
  • connection mode can also be adopted in the case of the embodiment according to FIG. 1.
  • the continuous sheets 3, 4 are generally not made in one piece along the entire length of the bridge. These sheets are preferably constituted by pleated sheet elements made in one piece in the direction perpendicular to the length of the bridge and fixed to each other in the length direction of the bridge by welding, riveting, bolting or the like.
  • FIGS. 4 to 17 have in common the fact that the frame upper is a concrete slab 1, 15.
  • the lower members consist of two metal beams 16 ( Figures 4, 5) or concrete 17 ( Figures 6, 7), the pleated sheets 3, 4 being perpendicular to the slab 15 .
  • two additional pleated sheets 18, 19 extend respectively from the edges of the sheet 3 adjacent to the slab 15 and to the beam 16 or 17 by forming a dihedral whose apex is located in the vertical plane P of symmetry of the bridge.
  • Figures 8 and 9 are cross-sectional views of the embodiment shown in Figure 1.
  • Figures 10 and 11 are similar to Figures 8 and 9. The difference is that the concrete beam 20 which constitutes the lower member is hollow and has a diameter greater than that of the beam 2 of Figures 1, 8 and 9 .
  • the lower chord is constituted by a concrete slab 21, 22, 23, 24, 25, 26 of variable width, less than that of the upper slab 15, the pleated sheets 3, 4 arranged symmetrically on either side of the vertical plane P of the bridge, forming a certain angle with this plane.
  • the shear forces give rise to a field uniform shear stress t.
  • the dimensioning of such a structure consists in verifying that the shear stress t is less on the one hand than the buckling stress tv with a suitable safety factor k, and on the other hand than the admissible shear stress tm for l steel, either: t ⁇ tv / k (1) t ⁇ tm (2)
  • Condition (4) is more severe than condition (1), but for bridge cores it is condition (6) which strongly penalizes discontinuous cores.
  • a core of continuous pleated sheet metal in accordance with the present invention can transmit a shearing force more than eight times greater than that which a core of discontinuous pleated sheet metal can transmit.
  • each bridge could have more than two continuous pleated sheets between the upper chord and the lower chord (s).

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Bridges Or Land Bridges (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

The bridge comprises at least one upper concrete boom (1) and one lower concrete or metal boom (2) connected together by structural elements which can withstand shearing forces. <??>These structural elements comprise two continuous steel sheets (3, 4), which are folded or corrugated and arranged on either side of a vertical median plane (P) of the bridge, the folds or corrugations continuing in a direction which is substantially perpendicular to the length of the bridge. <??>Use for increasing the shearing-force resistance of bridges. <IMAGE>

Description

La présente invention concerne un pont comprenant au moins une membrure supérieure en béton et une membrure inférieure en béton ou en métal reliées l'une à l'autre par des éléments de structure résistant aux efforts tranchants.The present invention relates to a bridge comprising at least one upper member in concrete and one lower member in concrete or metal connected to each other by structural elements resistant to shearing forces.

Les deux membrures du pont transmettent les moments, tandis que les éléments de structure ou âmes disposées entre ces membrures transmettent les efforts tranchants.The two members of the bridge transmit the moments, while the structural elements or webs arranged between these members transmit the shearing forces.

Dans des réalisations connues, les âmes sont constituées par une série de barres disposées suivant un N. Certaines de ces barres travaillent en compression et d'autres en traction.In known embodiments, the cores are constituted by a series of bars arranged according to an N. Some of these bars work in compression and others in traction.

Les membrures et les âmes peuvent être en béton et/ou en acier.The members and the webs can be made of concrete and / or steel.

Dans d'autres réalisations connues, par exemple selon le brevet suisse 378 504 et la demande de brevet français 2 494 400, les âmes disposées entre les membrures sont constituées par des éléments en tôles plissées. Ces tôles plissées sont discontinues, c'est-à-dire séparées les unes des autres dans le sens de la longueur du pont.In other known embodiments, for example according to Swiss patent 378 504 and French patent application 2 494 400, the cores arranged between the frames are constituted by elements made of pleated sheets. These pleated sheets are discontinuous, that is to say separated from each other along the length of the bridge.

Dans toutes les réalisations connues, si l'on veut obtenir que les âmes transmettent des efforts tranchants importants, on est obligé de multiplier le nombre des âmes et/ou d'augmenter l'épaisseur de celles-ci. Ainsi, dans le cas d'ouvrages destinés à supporter des efforts tranchants très importants, la construction est lourde et par conséquent difficile à mettre en oeuvre.In all known embodiments, if it is desired to obtain that the cores transmit significant cutting forces, it is necessary to multiply the number of cores and / or to increase the thickness of these. Thus, in the case of structures intended to withstand very large cutting forces, the construction is heavy and consequently difficult to implement.

Le but de la présente invention est de créer un pont qui résiste à des efforts tranchants très importants, tout en étant de construction légère et facile à mettre en oeuvre.The object of the present invention is to create a bridge which withstands very large cutting forces, while being of light construction and easy to implement.

Suivant l'invention, le pont comprenant au moins une membrure supérieure en béton et une membrure inférieure en béton ou en métal reliées l'une à l'autre par des éléments de structure résistant aux efforts tranchants est caractérisé en ce que ces éléments de structure comprennent deux tôles d'acier continues, plissées ou ondulées, disposées de part et d'autre d'un plan vertical médian du pont, les plis ou ondulations s'étendant dans une direction sensiblement perpendiculaire à la longueur du pont.According to the invention, the bridge comprising at least one upper concrete member and one lower concrete or metal member connected to one another by structural elements resistant to shearing forces is characterized in that these structural elements comprise two continuous steel sheets, pleated or corrugated, arranged on either side of a vertical median plane of the bridge, the folds or corrugations extending in a direction substantially perpendicular to the length from the bridge.

Il a été établi par la demanderesse que le fait de remplacer les âmes en tôles plissées discontinues connues selon le brevet suisse 378504 et la demande de brevet français 2 494 400 par des âmes en tôles plissées ou ondulées continues permettait d'accroître de façon considérable la résistance de l'ouvrage aux efforts tranchants.It has been established by the plaintiff that the fact of replacing the webs of discontinuous pleated sheets known according to Swiss patent 378504 and the French patent application 2 494 400 by webs of continuous pleated or corrugated sheets makes it possible to considerably increase the resistance of the structure to sharp forces.

Ainsi l'invention permet de réaliser un pont capable de résister à des efforts tranchants importants en utilisant des tôles plissées légères donc faciles à mettre en oeuvre.Thus, the invention makes it possible to produce a bridge capable of withstanding significant shearing forces by using light pleated sheets which are therefore easy to implement.

Selon une version préférée de l'invention, les tôles continues comprennent deux séries de bandes planes situées dans deux plans parallèles, les bandes de l'une des séries étant raccordées aux bandes de l'autre série par des bandes planes formant un certain angle avec ces dernières, la jonction entre les bandes étant constituée par une arête.According to a preferred version of the invention, the continuous sheets comprise two series of flat strips located in two parallel planes, the strips of one of the series being connected to the strips of the other series by flat strips forming an angle with the latter, the junction between the strips being constituted by an edge.

Cette structure confère à la tôle plissée une excellente résistance aux efforts tranchants, même lorsque cette tôle a une épaisseur réduite à quelques mm.This structure gives the pleated sheet excellent resistance to shearing forces, even when this sheet has a thickness reduced to a few mm.

Dans l'application considérée par la présente invention, l'épaisseur des tôles est comprise entre 8 et 12mm, l'amplitude des plis est comprise entre 10 et 30 cm et la dimension des tôles mesurée dans la direction de ces plis est comprise entre 2 et 12 m.In the application considered by the present invention, the thickness of the sheets is between 8 and 12 mm, the amplitude of the folds is between 10 and 30 cm and the size of the sheets measured in the direction of these folds is between 2 and 12 m.

D'autres particularités et avantages de l'invention apparaîtront encore dans la description ci-après.Other features and advantages of the invention will appear in the description below.

Aux dessins annexés donnés à titre d'exemples non limitatifs :

  • - la figure 1 est une vue en perspective partielle d'un pont conforme à l'invention,
  • - la figure 2 est une vue en coupe transversale d'une tôle plissée utilisée dans le pont conforme à l'invention,
  • - la figure 3 est une vue en perspective partielle d'une variante de réalisation d'un pont conforme à l'invention,
  • - les figures 4 à 17 sont des vues schématiques en coupe transversale, de différentes variantes de réalisation de l'invention,
  • - la figure 18 est une vue schématique latérale et partielle d'un pont conforme à l'invention, montrant comment la tôle plissée continue transmet les efforts,
  • - la figure 19 est une vue analogue à la figure 18, illustrant le cas d'un pont connu comportant des tôles plissées discontinues.
In the appended drawings given by way of nonlimiting examples:
  • FIG. 1 is a partial perspective view of a bridge according to the invention,
  • - Figure 2 is a cross-sectional view a pleated sheet used in the bridge according to the invention,
  • FIG. 3 is a partial perspective view of an alternative embodiment of a bridge according to the invention,
  • FIGS. 4 to 17 are schematic views in cross section, of different alternative embodiments of the invention,
  • FIG. 18 is a schematic side and partial view of a bridge according to the invention, showing how the continuous pleated sheet transmits the forces,
  • - Figure 19 is a view similar to Figure 18, illustrating the case of a known bridge having discontinuous pleated sheets.

Dans la réalisation de la figure 1, le pont conforme à l'invention comprend une membrure supérieure constituée par une dalle en béton 1 et une membrure inférieure constituée par une poutre en béton 2 reliée à la dalle 1 par deux tôles d'acier 3, 4 continues et plissées disposées de part et d'autre d'un plan vertical médian P du pont, les plis ou ondulations s'étendant dans une direction sensiblement perpendiculaire à la longueur du pont.In the embodiment of FIG. 1, the bridge according to the invention comprises an upper chord constituted by a concrete slab 1 and a lower chord formed by a concrete beam 2 connected to the slab 1 by two steel sheets 3, 4 continuous and pleated arranged on either side of a vertical median plane P of the bridge, the folds or undulations extending in a direction substantially perpendicular to the length of the bridge.

Dans l'exemple représenté sur la figure 1, l'ensemble constitué par la dalle 1, la poutre 2 et les tôles plissées 3, 4 repose sur des piliers en béton 5 par l'intermédiaire de plots latéraux 6 s'étendant entre la dalle 1 et la poutre 2. Comme on le voit sur la figure 2, les tôles continues 3, 4 comprennent chacune deux séries de bandes planes 7, 8 situées dans deux plans parallèles, les bandes 7 de l'une des séries étant raccordées aux bandes de l'autre série par des bandes planes 9 formant un certain angle ª (égal à 37° dans l'exemple représenté) avec ces dernières, la jonction entre les bandes étant constituée par une arête.In the example shown in FIG. 1, the assembly constituted by the slab 1, the beam 2 and the pleated sheets 3, 4 rests on concrete pillars 5 by means of lateral studs 6 extending between the slab 1 and the beam 2. As can be seen in FIG. 2, the continuous sheets 3, 4 each comprise two series of flat strips 7, 8 situated in two parallel planes, the strips 7 of one of the series being connected to the strips of the other series by flat bands 9 forming an angle ª (equal to 37 ° in the example shown) with the latter, the junction between the bands being constituted by an edge.

Suivant les efforts que doit supporter le pont, l'épaisseur des tôles 3, 4 peut varier entre 8 et 12 mm, l'amplitude A des plis 7, 9; 9, 8 peut varier entre 10 et 30cm et la dimension des tôles mesurée dans la direction longitudinale de ces plis peut varier entre 2 et 12 m. Par ailleurs, la largeur des bandes 7, 8, 9 peut varier entre 0,25 et 0,50 m.Depending on the forces that the bridge has to bear, the thickness of the sheets 3, 4 can vary between 8 and 12 mm, the amplitude A of the folds 7, 9; 9, 8 can vary between 10 and 30cm and the size of the sheets measured in the longitudinal direction of these folds can vary between 2 and 12 m. Furthermore, the width of the strips 7, 8, 9 can vary between 0.25 and 0.50 m.

Dans le cas de la réalisation de la figure 1, l'ensemble constitué par la dalle 1, les deux tôles plissées 3, 4 et la poutre inférieure 2 forme une structure tubulaire de section triangulaire constante. Etant donné que les tôles plissées 3, 4 sont continues, la surface latérale de l'ensemble précité est complètement fermée.In the case of the embodiment of FIG. 1, the assembly constituted by the slab 1, the two pleated sheets 3, 4 and the lower beam 2 forms a tubular structure of constant triangular section. Since the pleated sheets 3, 4 are continuous, the lateral surface of the above-mentioned assembly is completely closed.

Tel est également le cas dans le pont représenté sur la figure 3. Dans cet exemple, les membrures supérieure et inférieure sont constituées par des dalles 10, 11 parallèles en béton. Celles-ci sont reliées l'une à l'autre par deux tôles plissées 3, 4 identiques à celles de la réalisation selon la figure 1.This is also the case in the bridge shown in Figure 3. In this example, the upper and lower members are formed by concrete slabs 10, 11. These are connected to each other by two pleated sheets 3, 4 identical to those of the embodiment according to FIG. 1.

Sur la figure 3, on voit en outre que chaque tôle plissée 3, 4 comporte à chacun de ses bords adjacents aux dalles 10, 11 une plaque 12, 13 perpendiculaire au plan général de la tôle 3, 4 et débordant de part et d'autre de ce plan. Ces plaques 12, 13 comprennent sur leur face orientée vers l'extérieur, une série de connecteurs métalliques 14 noyés dans le béton des dalles 10, 11.In FIG. 3, it can also be seen that each pleated sheet 3, 4 has at each of its edges adjacent to the slabs 10, 11 a plate 12, 13 perpendicular to the general plane of the sheet 3, 4 and projecting from both sides. other of this plan. These plates 12, 13 comprise on their face facing outwards, a series of metal connectors 14 embedded in the concrete of the slabs 10, 11.

Ainsi, les tôles 3, 4 sont solidement ancrées aux dalles 10, 11.Thus, the sheets 3, 4 are firmly anchored to the slabs 10, 11.

Un tel mode de liaison peut également être adopté dans le cas de la réalisation selon la figure 1.Such a connection mode can also be adopted in the case of the embodiment according to FIG. 1.

Les tôles continues 3, 4 ne sont généralement pas réalisées d'une seule pièce suivant toute la longueur du pont. Ces tôles sont de préférence constituées par des éléments de tôles plissées réalisés d'une seule pièce dans la direction perpendiculaire à la longueur du pont et fixés les uns aux autres dans le sens de la longueur du pont par soudage, rivetage, boulonnage ou analogue.The continuous sheets 3, 4 are generally not made in one piece along the entire length of the bridge. These sheets are preferably constituted by pleated sheet elements made in one piece in the direction perpendicular to the length of the bridge and fixed to each other in the length direction of the bridge by welding, riveting, bolting or the like.

Les variantes de réalisation représentées sur les figures 4 à 17 présentent en commun le fait que la membrure supérieure est une dalle 1, 15 en béton.The variant embodiments shown in FIGS. 4 to 17 have in common the fact that the frame upper is a concrete slab 1, 15.

Dans les variantes représentées sur les figures 4 à 7, les membrures inférieures sont constituées par deux poutres métalliques 16 (figures 4, 5) ou en béton 17 (figures 6, 7), les tôles plissées 3, 4 étant perpendiculaires à la dalle 15.In the variants shown in Figures 4 to 7, the lower members consist of two metal beams 16 (Figures 4, 5) or concrete 17 (Figures 6, 7), the pleated sheets 3, 4 being perpendicular to the slab 15 .

Dans le cas des figures 5 et 7, deux tôles plissées 18, 19 supplémentaires s'étendent respectivement à partir des bords de la tôle 3 adjacents à la dalle 15 et à la poutre 16 ou 17 en formant un dièdre dont le sommet est situé dans le plan vertical P de symétrie du pont.In the case of FIGS. 5 and 7, two additional pleated sheets 18, 19 extend respectively from the edges of the sheet 3 adjacent to the slab 15 and to the beam 16 or 17 by forming a dihedral whose apex is located in the vertical plane P of symmetry of the bridge.

Ces deux tôles 18, 19 formant un dièdre, permettent de renforcer la structure.These two sheets 18, 19 forming a dihedral, make it possible to reinforce the structure.

Les figures 8 et 9 sont des vues en coupe transversale de la réalisation représentée sur la figure 1.Figures 8 and 9 are cross-sectional views of the embodiment shown in Figure 1.

Les figures 10 et 11 sont analogues aux figures 8 et 9. La différence réside dans le fait que la poutre en béton 20 qui constitue la membrure inférieure est creuse et présente un diamètre supérieur à celui de la poutre 2 des figures 1, 8 et 9.Figures 10 and 11 are similar to Figures 8 and 9. The difference is that the concrete beam 20 which constitutes the lower member is hollow and has a diameter greater than that of the beam 2 of Figures 1, 8 and 9 .

Dans les réalisations des figures 12 à 17, la membrure inférieure est constituée par une dalle en béton 21, 22, 23, 24, 25, 26 de largeur variable, inférieure à celle de la dalle supérieure 15, les tôles plissées 3, 4 disposées symétriquement de part et d'autre du plan P vertical du pont, formant un certain angle avec ce plan.In the embodiments of FIGS. 12 to 17, the lower chord is constituted by a concrete slab 21, 22, 23, 24, 25, 26 of variable width, less than that of the upper slab 15, the pleated sheets 3, 4 arranged symmetrically on either side of the vertical plane P of the bridge, forming a certain angle with this plane.

Toutes les réalisations que nous venons de décrire présentent les avantages d'être de mise en oeuvre facile, relativement peu onéreuses, et légères, tout en présentant une résistance aux efforts tranchants nettement plus importante que celle des structures connues utilisant des tôles plissées discontinues conformes au brevet suisse 378504 et la demande de brevet français 2 494 400 comme on va le démontrer ci-après.All the embodiments that we have just described have the advantages of being easy to implement, relatively inexpensive, and light, while presenting a resistance to shearing forces which is clearly greater than that of known structures using discontinuous pleated sheets conforming to Swiss Patent 378,504 and French Patent Application 2,494,400 as will be demonstrated below.

Dans une âme en tôle plissée continue 3 (voir figure 18), les efforts tranchants donnent lieu à un champ uniforme de contraintes de cisaillement t. Le dimensionnement d'une telle structure consiste à vérifier que la contrainte de cisaillement t est inférieure d'une part à la contrainte de voilement tv avec un coefficient de sécruité k convenable, et d'autre part à la contrainte de cisaillement admissible tm pour l'acier, soit :
    t < tv/k (1)
    t < tm (2)In a continuous pleated sheet core 3 (see Figure 18), the shear forces give rise to a field uniform shear stress t. The dimensioning of such a structure consists in verifying that the shear stress t is less on the one hand than the buckling stress tv with a suitable safety factor k, and on the other hand than the admissible shear stress tm for l steel, either:
t <tv / k (1)
t <tm (2)

Dans une âme en tôle plissée discontinue 3b, 3c, 3d (voir figure 19), les efforts tranchants donnent également lieu à des contraintes de cisaillement t, mais il s'y ajoutent des contraintes s de compression et de traction longitudinales (c'est-à-dire parallèles à la génératrice des plis) dues au moment de flexion qui sollicite chaque élément d'âme (comportement dit de "poutre échelle".) Pour le dimensionnement d'une telle structure, il convient de vérifier que la contrainte de cisaillement t est inférieure à la valeur admissible tm, que la stabilité reste assurée sous l'action conjuguée du cisaillement et des contraintes de compression et enfin que les contraintes de compression sont inférieures à la valeur sm admissible, soit :
    f (t, s) < fm (4)
    t < tm (5)
    s < sm (6)In a discontinuous pleated sheet core 3b, 3c, 3d (see Figure 19), the shear forces also give rise to shear stresses t, but there are added compressive and longitudinal tensile stresses (this is ie parallel to the generator of the folds) due to the bending moment which requests each core element (so-called "ladder beam" behavior.) For the dimensioning of such a structure, it should be checked that the stress of shear t is less than the admissible value tm, that the stability remains ensured under the combined action of the shear and the compressive stresses and finally that the compressive stresses are lower than the admissible value sm, that is to say:
f (t, s) <fm (4)
t <tm (5)
s <sm (6)

La condition (4) est plus sévère que la condition (1), mais pour les âmes de pont c'est la condition (6) qui pénalise fortement les âmes discontinues.Condition (4) is more severe than condition (1), but for bridge cores it is condition (6) which strongly penalizes discontinuous cores.

Examinons à titre d'exemple le cas d'un pont courant de 60 m de portée. La hauteur h de l'âme est d'environ 1/20 de la portée, soit 3,0 m.As an example, consider the case of a running bridge with a span of 60 m. The height h of the web is approximately 1/20 of the span, or 3.0 m.

L'âme en tôle plissée continue a les caractéristiques suivantes :
    - épaisseur : e = 0,008 m
    - largeur d'un panneau : l = 0,3 m
    - amplitude : a = 0,18 m
    - hauteur de l'âme : h = 3,0 mThe core of continuous pleated sheet has the following characteristics:
- thickness: e = 0.008 m
- width of a panel: l = 0.3 m
- amplitude: a = 0.18 m
- core height: h = 3.0 m

Cette âme en tôle plissée continue peut résister à un effort tranchant Tc qui vaut :
    Tc = tm x e x h, or tm = 0,42 se
    se = 360 Mpa (limite élastique de l'acier)
d'où : Tc = 0,42 x 360 x 0,008 x 3 = 3,63 MN
    Tc = 3,63 MN = 370 tonnes.This continuous pleated sheet core can withstand a shearing force T c which is worth:
T c = tm xexh, or tm = 0.42 se
se = 360 Mpa (yield strength of steel)
hence: T c = 0.42 x 360 x 0.008 x 3 = 3.63 MN
T c = 3.63 MN = 370 tonnes.

L'âme discontinue de mêmes caractéristiques (voir figure 19) résiste à un effort tranchant Td ; chaque élément d'âme a une largeur totale L = 0,5 m et une inertie I
    I = e x L³/12 = 0,008 x 0,5³/12 = 0,0000833 m⁴The discontinuous core with the same characteristics (see FIG. 19) resists a shearing force T d ; each core element has a total width L = 0.5 m and an inertia I
I = ex L³ / 12 = 0.008 x 0.5³ / 12 = 0.0000833 m⁴

Les éléments d'âme sont soumis à des moments de flexion M qui sont maximums aux extrémités où ils valent :
    M = ± Td.L/h x H/2 = ± 0,25 Td The core elements are subjected to bending moments M which are maximum at the ends where they are worth:
M = ± T d. L / hx H / 2 = ± 0.25 T d

A ces moments correspondent des contraintes de compression et de traction :
    s = M/I x L/2 = 0,25/0,0000833 = 0,5/2 x Td = 750 Td These moments correspond to compression and tensile stresses:
s = M / I x L / 2 = 0.25 / 0.0000833 = 0.5 / 2 x T d = 750 T d

D'autre part : sm = se/1,15 = 313 MPa
    La condition (6) donne
    740 Td ≦ 313
    Td ≦ 0,417 MN = 42,5 tonnes.
    On constate que le rapport Tc/Td est très élevé :
    Tc/Td = 370/42,5 = 8,7On the other hand: sm = se / 1.15 = 313 MPa
Condition (6) gives
740 T d ≦ 313
T d ≦ 0.417 MN = 42.5 tonnes.
It can be seen that the ratio T c / T d is very high:
T c / T d = 370 / 42.5 = 8.7

Ainsi, pour un dimensionnement identique, une âme en tôle plissée continue conforme à la présente invention peut transmettre un effort tranchant plus de huit fois supérieur à celui que peut transmettre une âme en tôle plissée discontinue.Thus, for an identical dimensioning, a core of continuous pleated sheet metal in accordance with the present invention can transmit a shearing force more than eight times greater than that which a core of discontinuous pleated sheet metal can transmit.

Bien entendu, l'invention n'est pas limitée aux exemples de réalisation que l'on vient de décrire et on peut apporter à ceux-ci de nombreuses modifications sans sortir du cadre de l'invention.Of course, the invention is not limited to the embodiments which have just been described and many modifications can be made to them without departing from the scope of the invention.

Ainsi, chaque pont pourrait comporter plus de deux tôles plissées continues entre la membrure supérieure et la ou les membrures inférieures.Thus, each bridge could have more than two continuous pleated sheets between the upper chord and the lower chord (s).

Claims (9)

1. Pont comprenant au moins une membrure supérieure en béton (1, 10, 15) et une membrure inférieure en béton ou en métal (2, 11, 16, 17, 20, 21) reliées l'une à l'autre par des éléments de structure résistant aux efforts tranchants, caractérisé en ce que ces éléments de structure comprennent deux tôles d'acier (3, 4) continues, plissées ou ondulées disposées de part et d'autre d'un plan vertical médian (P) du pont, les plis ou ondulations s'étendant dans une direction sensiblement perpendiculaire à la longueur du pont.1. Bridge comprising at least one upper concrete member (1, 10, 15) and one lower concrete or metal member (2, 11, 16, 17, 20, 21) connected to each other by structural elements resistant to shearing forces, characterized in that these structural elements comprise two continuous, pleated or corrugated steel sheets (3, 4) arranged on either side of a vertical median plane (P) of the bridge , the folds or undulations extending in a direction substantially perpendicular to the length of the bridge. 2. Pont conforme à la revendication 1, caractérisé en ce que les tôles continues (3, 4) comprennent deux séries de bandes planes (7, 8) situées dans deux plans parallèles, les bandes de l'une des séries étant raccordées aux bandes de l'autre série par des bandes planes (9) formant un certain angle avec ces dernières, la jonction entre les bandes étant constituée par une arête.2. Bridge according to claim 1, characterized in that the continuous sheets (3, 4) comprise two series of flat strips (7, 8) located in two parallel planes, the strips of one of the series being connected to the strips of the other series by flat bands (9) forming an angle with the latter, the junction between the bands being constituted by an edge. 3. Pont conforme à l'une des revendications 1 ou 2, caractérisé en ce que l'épaisseur des tôles (3, 4) est comprise entre 8 et 12 mm, l'amplitude des plis est comprise entre 10 et 30 cm et la dimension des tôles mesurée dans la direction de ces plis est comprise entre 2 et 12 m.3. Bridge according to one of claims 1 or 2, characterized in that the thickness of the sheets (3, 4) is between 8 and 12 mm, the amplitude of the folds is between 10 and 30 cm and the dimension of the sheets measured in the direction of these folds is between 2 and 12 m. 4. Pont conforme à l'une des revendications 1 à 3, caractérisé en ce qu'il comprend une membrure supérieure constituée par une dalle en béton (1, 10, 15) et deux membrures inférieures constituées par deux poutres parallèles (16, 17) reliées chacune à la dalle en béton par une tôle plissée continue (3, 4).4. Bridge according to one of claims 1 to 3, characterized in that it comprises an upper member constituted by a concrete slab (1, 10, 15) and two lower members constituted by two parallel beams (16, 17 ) each connected to the concrete slab by a continuous pleated sheet (3, 4). 5. Pont conforme à l'une des revendications 1 à 3, caractérisé en ce qu'il comprend une membrure supérieure constituée par une dalle en béton (1, 10, 15) et une membrure inférieure unique constituée par une poutre en béton (2, 20) ou en métal ou par un tube métallique rempli de béton reliée à la dalle en béton par deux tôles plissées continues (3, 4).5. Bridge according to one of claims 1 to 3, characterized in that it comprises an upper member constituted by a concrete slab (1, 10, 15) and a single lower member constituted by a concrete beam (2 , 20) or in metal or by a metal tube filled with concrete connected to the concrete slab by two continuous pleated sheets (3, 4). 6. Pont conforme à l'une des revendications 1 à 5, caractérisé en ce que les tôles plissées continues (3, 4) forment avec les membrures une structure tubulaire dont la surface latérale est entièrement fermée.6. Bridge according to one of claims 1 to 5, characterized in that the continuous pleated sheets (3, 4) form with the members a tubular structure whose lateral surface is completely closed. 7. Pont conforme à l'une des revendications 1 à 6, caractérisé en ce que les tôles plissées continues (3, 4) sont constituées par des éléments de tôles plissées réalisés d'une seule pièce dans la direction perpendiculaire à la longueur du pont et fixés les uns aux autres dans le sens de la longueur du pont par soudage, rivetage, boulonnage ou analogue.7. Bridge according to one of claims 1 to 6, characterized in that the continuous pleated sheets (3, 4) consist of pleated sheet elements made in one piece in the direction perpendicular to the length of the bridge and fixed to each other along the length of the bridge by welding, riveting, bolting or the like. 8. Pont conforme à l'une des revendications 1 à 7, caractérisé en ce que chaque tôle plissée (3, 4) comporte à chacun de ses bords adjacents aux membrures (10, 11) une plaque (12, 13) perpendiculaire au plan général de la tôle et débordant de part et d'autre de ce plan, cette plaque (12, 13) comprenant sur sa face orientée vers l'extérieur, une série de connecteurs (14) fixés aux membrures.8. Bridge according to one of claims 1 to 7, characterized in that each pleated sheet (3, 4) has at each of its edges adjacent to the members (10, 11) a plate (12, 13) perpendicular to the plane general of the sheet and projecting on either side of this plane, this plate (12, 13) comprising on its face facing outwards, a series of connectors (14) fixed to the frames. 9. Pont conforme à la revendication 8, caractérisé en ce que les connecteurs (14) sont noyés dans le béton de l'une au moins des deux membrures.9. Bridge according to claim 8, characterized in that the connectors (14) are embedded in the concrete of at least one of the two frames.
EP88400552A 1987-03-11 1988-03-09 Bridge with girders linked by corrugated sheets Expired - Lifetime EP0283383B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88400552T ATE59867T1 (en) 1987-03-11 1988-03-09 BRIDGE WITH BELTS CONNECTED BY WAVE SHEET.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8703337 1987-03-11
FR8703337A FR2612216B1 (en) 1987-03-11 1987-03-11 BRIDGE WITH JOINTS CONNECTED BY PLEATED SHEETS

Publications (2)

Publication Number Publication Date
EP0283383A1 true EP0283383A1 (en) 1988-09-21
EP0283383B1 EP0283383B1 (en) 1991-01-09

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ID=9348855

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Application Number Title Priority Date Filing Date
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Country Status (9)

Country Link
US (1) US4912794A (en)
EP (1) EP0283383B1 (en)
AT (1) ATE59867T1 (en)
DE (2) DE283383T1 (en)
ES (1) ES2003852B3 (en)
FR (1) FR2612216B1 (en)
GR (1) GR880300165T1 (en)
NO (1) NO880997L (en)
PT (1) PT86943B (en)

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FR2693491A1 (en) * 1992-07-09 1994-01-14 Dumez Factory made site assembled steel sheet bridge beams and deck units - comprise steel main beams fixed to deck spanning between and acting as permanent shuttering for concrete with stiffeners below
EP0637647A1 (en) * 1993-08-04 1995-02-08 Campenon Bernard Sge Metalgirder element for the construction of composite elongated structures like box beams, method for using the element and elongated structure manufactured by this method
FR2798407A1 (en) * 1999-09-15 2001-03-16 Entpr Razel Freres CONTINUOUS CORE SET FOR MIXED-FRAME ARTWORK, AND MIXED-FRAME ARTWORK MADE WITH SUCH A CORE SET
WO2007076734A1 (en) * 2005-12-30 2007-07-12 Universität Kassel Bridge construction
FR2906547A1 (en) * 2006-10-02 2008-04-04 Razel Sa Mixed framework structure for use in two path roadway, has upper and lower slabs connected by flat continuous metallic plate, and connectors ensuring connection between metallic plates and upper and lower slabs

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FR2693491A1 (en) * 1992-07-09 1994-01-14 Dumez Factory made site assembled steel sheet bridge beams and deck units - comprise steel main beams fixed to deck spanning between and acting as permanent shuttering for concrete with stiffeners below
EP0637647A1 (en) * 1993-08-04 1995-02-08 Campenon Bernard Sge Metalgirder element for the construction of composite elongated structures like box beams, method for using the element and elongated structure manufactured by this method
FR2708638A1 (en) * 1993-08-04 1995-02-10 Campenon Bernard Sge Metal beam element for producing a mixed elongated structure with a cross-section of the box type, method for implementing this element, and elongated structure produced by implementing this method.
FR2798407A1 (en) * 1999-09-15 2001-03-16 Entpr Razel Freres CONTINUOUS CORE SET FOR MIXED-FRAME ARTWORK, AND MIXED-FRAME ARTWORK MADE WITH SUCH A CORE SET
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WO2007076734A1 (en) * 2005-12-30 2007-07-12 Universität Kassel Bridge construction
FR2906547A1 (en) * 2006-10-02 2008-04-04 Razel Sa Mixed framework structure for use in two path roadway, has upper and lower slabs connected by flat continuous metallic plate, and connectors ensuring connection between metallic plates and upper and lower slabs

Also Published As

Publication number Publication date
DE3861479D1 (en) 1991-02-14
ATE59867T1 (en) 1991-01-15
ES2003852B3 (en) 1991-08-01
FR2612216A1 (en) 1988-09-16
NO880997L (en) 1988-09-12
PT86943A (en) 1989-03-30
ES2003852A4 (en) 1988-12-01
FR2612216B1 (en) 1991-07-05
EP0283383B1 (en) 1991-01-09
US4912794A (en) 1990-04-03
PT86943B (en) 1995-03-01
DE283383T1 (en) 1989-01-05
NO880997D0 (en) 1988-03-04
GR880300165T1 (en) 1989-01-31

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