EP0086993B1 - Poutre en treillis - Google Patents
Poutre en treillis Download PDFInfo
- Publication number
- EP0086993B1 EP0086993B1 EP83100828A EP83100828A EP0086993B1 EP 0086993 B1 EP0086993 B1 EP 0086993B1 EP 83100828 A EP83100828 A EP 83100828A EP 83100828 A EP83100828 A EP 83100828A EP 0086993 B1 EP0086993 B1 EP 0086993B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- struts
- strut
- boom
- gravity
- profile
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C3/08—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with apertured web, e.g. with a web consisting of bar-like components; Honeycomb girders
- E04C3/09—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with apertured web, e.g. with a web consisting of bar-like components; Honeycomb girders at least partly of bent or otherwise deformed strip- or sheet-like material
-
- 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
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0486—Truss like structures composed of separate truss elements
-
- 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
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0486—Truss like structures composed of separate truss elements
- E04C2003/0491—Truss like structures composed of separate truss elements the truss elements being located in one single surface or in several parallel surfaces
Definitions
- the invention relates to a welded truss of the type mentioned.
- the strut bars have a V-shaped cross-section, open profile.
- the strut ends are deformed over a predetermined longitudinal section to form the flat strip cross section, which is perpendicular to the main carrier plane and is used to form a welded node.
- the strut ends deformed into a flat strip cross section extend exactly the center of gravity of the undeformed, open strut profile, it is necessary to flatten the cross-sectional profile of the struts and also to bend them until the center of gravity in the flattened extension area is flush with the center of gravity of the rest of the profile.
- the deformation of the strut ends is expensive and complex and must be carried out with great precision and using special tools. In practice, it has even proven to be more expedient to start from a flat strip material and to deform or emboss this strip material between the flat strut ends into the open strut profile. However, special tools are also required for this, so that the individual struts cannot be endlessly prefabricated.
- a proposal for the formation of a truss girder is known (FR-PS-900 974), in which the struts of the strut structure are formed from profiles with a tubular cross-section, the struts being flattened at their ends as an extension of the center line of the strut profile.
- this lattice girder does not meet modern requirements, since no common intersection points of all clashing lines of gravity are possible in the nodes, these struts have the disadvantage that they bend slightly in the exposed transition area from the full profile cross section to the flattened end cross section.
- Such closed profiles for struts of a truss are also not compatible with the requirements of lightweight construction, since they drive the weight of the truss too high in relation to the load-bearing capacity.
- the invention has for its object to provide a welded truss of the type mentioned, which is characterized by particularly buckling and twist-resistant struts in the strut, the struts should be particularly simple and inexpensive to manufacture and process.
- Such a profile of the struts is characterized in that the pressure point lies in the center of gravity, that is to say that the kink or twist resistance of the strut is significantly higher than in the case of other, open profiles.
- both the center of gravity and the pressure point remain unchanged regardless of the symmetrical deformation of the profile cross section up to the flat or flat band cross section, so that it is not difficult to find the center of gravity and the line on which the pressure point lies, right up to the point of intersection with the Continuing the center of gravity of the belt or the other strut.
- Another particularly important aspect is the simple and inexpensive manufacture of this profile.
- Such struts can be produced as endless rolled profiles, it then being sufficient for the individual struts, e.g. B. with a pair of flat scissors or guillotine shears, since in this cutting process the strut end is deformed down to a flat strip cross section, as is required for the further processing of the struts in the truss.
- the single str ben who carry the extension section need only be rolled flat over the length of the extension section and bent accordingly, which can also be carried out quickly and inexpensively with a simple tool.
- this strut design despite a significantly increased kink, pressure and twist resistance of the struts, there is a favorable support weight in relation to the load-bearing capacity.
- the outstanding advantages of the profile cross-section lie in its simple deformation. Regardless of whether a rolled continuous profile with an S- or Z-shaped cross-section is assumed, which is flattened to form the flat strip cross-section, or whether a flat strip material is assumed which is rolled into the cross-sectional shape, the result is in the transition area from the strip cross-section a straight line continuation of the center of gravity on the S or Z cross section. No exceptional care needs to be taken when deforming, since the profile height decrease or increase is symmetrical, ie in the vertical direction from the center of gravity. The gradual decrease in the profile height has the advantage that an abrupt transition and thus a risk of kinking is avoided.
- Claim 3 relates to an embodiment of this truss girder according to the invention, in which the gradual deformation from the profile to the band cross-section, as known for example from FR-PS-900 974, takes place in a certain longitudinal section, the longitudinal section running according to the invention, where the profile side edges are welded to the belt.
- Open or closed hollow profiles have a high structural strength despite their low weight due to the profiling.
- they desirably form an extraordinarily stable bond with the struts.
- the inner walls of the hollow profiles of the belt have to compensate or absorb this divergence, so that these divergent profile side edges do not need to be straightened or eliminated by additional and expensive measures during the production of the struts. Most conveniently, this is done by the oblique sections of the inner walls of the hollow profiles, which compensate for this divergence.
- an embodiment of a carrier has now proven to be particularly useful with regard to the relationship between the carrier weight and the load-bearing capacity, as can be inferred from claim 5.
- the ⁇ -shaped cross section of the hollow profiles leads, in addition to the advantage of compensating for the divergence of the profile side edges of the longitudinal struts in the node, to the fact that the kinked inner wall of the hollow profile is significantly more resistant to buckling and kinking than an inner wall of comparable height with a comparable hollow profile with a flat inner wall .
- a node K is shown in perspective from a lightweight truss, this node being provided here, for example, in a lower flange U of the truss.
- the strut 1 coming from top right in Fig. 3 has an extension section 12 which is bent along the center line S of the lower flange, which is indicated here by dashed lines, and follows this center line.
- the lower chord U is formed by two open hollow sections 11, 24 arranged in parallel and at a distance from one another and having a ⁇ -shaped cross section.
- the struts 1 have an S-shaped cross-sectional profile, which is gradually flattened in the area of extension of the struts to a flat band cross-section, with which the struts extend into the lower flange U.
- Figures 1 and 2 show the profile course and the formation of the node K in detail.
- the struts have a cross section that approximately corresponds to an open S.
- a middle, essentially straight web 2 merges into arc sections 3 and 4, which run in opposite directions, to which end sections 5 and 6, which are approximately parallel to one another, adjoin.
- One longitudinal edge of the profile is designated 7, while the other is designated 8.
- the profile width of profile side edges 9 and 10 is determined and denoted by b A.
- the profile width b A is measured in the direction of the so-called minimum axis X, which minimum axis is the axis of the minimum moment of inertia passing through the center of gravity S of the cross-sectional area or the profile.
- the maximum axis Y that is the axis of the maximum moment of inertia, is perpendicular to this axis X. It also passes through the center of gravity S. In this rotationally symmetrical profile cross-sectional shape, the so-called pressure point D also coincides with the center of gravity S.
- the profile height h A is measured in the direction of the maximum axis Y.
- the struts 1 with the cross-sectional shape according to FIG. 1, bottom illustration, run between the straps of the carrier and form the strut mechanism.
- their cross-section is deformed up to a flat strip cross-section (FIG. 1, illustration C).
- the profile side edges 9, 10 inevitably diverge in the area between A and C (see also FIG. 1), and approximately with a straight course, as the line drawn between points A1 through B1 to C1 in FIG. 1 shows.
- section D the profile height from h A to h .
- the profile width has increased from b A to b B.
- the profile height h has decreased symmetrically with respect to the minimum axis or center of gravity (is the same as the line of center of gravity S). In other words, despite the change in cross section from the full profile height to the profile height of the strip cross section, the center of gravity has been continued in a straight line. This desirable effect is due to the selected profile shape.
- both mutually abutting struts are welded to the belt (upper belt or lower belt), as is indicated by the weld seams 13, 14, 15 and 16. This welding is of course carried out with two hollow profiles 11, 24, on their inner walls 30.
- the center of gravity S of the two struts 1 meet with the center of gravity S of the lower flange at a common point.
- the center of gravity S lies at a distance H from the upper side of the belt designated by 34.
- extension section 12 has the extension section 12 bent at the node K in the direction of the center of gravity S of the belt, in which the flat band cross section is maintained.
- This extension section 12 is also welded to the inner walls 30 of the hollow profiles 11 and 24 and form a so-called buckle with them.
- a corrugation of the extension section 12 is expedient, at least in the area in which the weld seams 19, 20 end with the inner walls 30.
- a corrugation 21 is indicated in solid lines, which leads to a tongue 22 via a rounded transition 23 which avoids a notch effect.
- the corrugation 21 creates a rounded bend in the area of the transition 23 to improve the resistance to buckling or buckling in this area.
- extension section 12 is corrugated over a larger part of its longitudinal extent, which would contribute to improving the effect of the buckle.
- the band-shaped cross section of the strut 1 coming from the top right comes into the bend between the extension section 12 and the strut on the left in FIG. 2 butt welds 17, 18 here run along the joints between the two struts 1 and go in the area of the Sidewalls 30 in the other welds.
- Fig. 2 From Fig. 2 it can also be seen how the profile side edges indicated in Fig. 1 or the points A1, B1 and C1 lying there are gradually rotated into the plane of the drawing by the gradual rotation of the profile side edges as a result of the deformation to form a flat strip cross section, so that the struts ultimately with the profile side edges fit snugly against the inner walls 30 of the hollow profiles 11, 24.
- FIG. 4 the node K of FIGS. 3 and 2 is shown in a view of the section plane IV-IV of FIG. 2.
- the diverging profile side edges 7, 8 or the profile side edges 9, 10 which are highlighted can be seen.
- the center of gravity S of the struts 1 lead to the center of gravity S of the belt, which in FIG. 4 runs perpendicular to the plane of the drawing.
- the hollow profile 11 can be seen in solid lines from the lower flange in FIG. 4, which is designed here with a ⁇ -shaped cross-sectional configuration.
- the hollow profile 11 will of course be combined in the belt with a mirror image arranged hollow profile 24 of the same cross-sectional shape.
- hollow profile shapes are indicated in dashed or dash-dotted lines on the side opposite the hollow profile 11.
- a U-profile 31 which is inclined in accordance with the divergence of the profile side edges could be used to form the lower flange, with the lower leg of this U-profile then also being able to be placed horizontally, as indicated at 32, for later placement of the carrier on a bearing.
- a completely closed box section 33 could also be used to form the lower flange, which, however, would also have to be inclined due to the divergence of the profile side edges.
- the hollow profile 11 on the right in FIG. 4 could also be designed as a closed box profile or have an additional end plate (comparable to that indicated at 33).
- the hollow profile 11 with its ⁇ -shaped cross section has two mutually parallel legs 27 which are provided with bends 25 and 26 which improve the structural strength.
- the two legs 27 are connected to one another by the profile inner wall 30, which profile inner wall consists of two wall sections 30a and 30b which are bent symmetrically at an angle to one another and meet in a continuous crease line 29.
- the kink line 29 lies at the level of the heavy line S of the lower chord.
- the inclination of at least the wall section 30a is so matched to the divergence of the profile side edges of the struts 1 that the minimal axis designated X1 of the hollow profile 11 is parallel to the main plane labeled T, and that the top 34 or the legs 27 are perpendicular to this Main plane T of the carrier lie.
- the cross-sectional shape of the hollow profile 11 not only compensates for the divergence of the profile side edges as a result of the deformation of the profile of the struts from the S shape to the flat strip cross-section, but also brings about a significantly improved buckling resistance or kink resistance of the hollow profile 11. If the welding of the extension section 12 to the wall 30 of FIG. 2 is considered, it can be seen that, according to FIG. 4, an extraordinarily stable fastening between the hollow profiles 11 and 24 (FIG. 3) of the respective belt is achieved when the edges of the extension section 12 are welded to the inner walls in the area of the fold lines 29.
- Fig. 5 it is finally schematically emphasized how the extension section 12 welded between the hollow profiles 11 and 24 forms the buckle in the upper chord or lower chord (U, 0), where it is welded to the two hollow profiles 11, 24 along the buckling lines 29 .
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT83100828T ATE19666T1 (de) | 1982-02-01 | 1983-01-28 | Fachwerktraeger. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3203245A DE3203245C2 (de) | 1982-02-01 | 1982-02-01 | Fachwerkträger |
DE3203245 | 1982-02-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0086993A1 EP0086993A1 (fr) | 1983-08-31 |
EP0086993B1 true EP0086993B1 (fr) | 1986-05-07 |
Family
ID=6154464
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83100828A Expired EP0086993B1 (fr) | 1982-02-01 | 1983-01-28 | Poutre en treillis |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0086993B1 (fr) |
AT (1) | ATE19666T1 (fr) |
DE (1) | DE3203245C2 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3941470A1 (de) * | 1989-12-15 | 1991-06-20 | Martin Wiese | Gittertraeger fuer raumfachwerke |
GB8929100D0 (en) * | 1989-12-22 | 1990-02-28 | Conder Group Plc | Support structure |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE499978C (de) * | 1928-06-12 | 1930-06-16 | E H Hugo Junkers Dr Ing | Knotenpunkt fuer Stabnetzwerke mit abgebogenen und flach gegeneinandergelegten Enden duennwandiger Formstaebe |
NL28987C (fr) * | 1929-09-26 | |||
FR900974A (fr) * | 1944-01-05 | 1945-07-13 | Perfectionnements aux charpentes métalliques soudées | |
CH274742A (fr) * | 1948-12-13 | 1951-04-30 | A A I N S | Treillis métallique. |
US3064771A (en) * | 1959-08-25 | 1962-11-20 | Walter D Behlen | Large span building covering unit |
AT279127B (de) * | 1968-02-19 | 1970-02-25 | Ernst Baumann | Fachwerksträger, -stütze od.dgl. und Verfahren zu dessen bzw. deren Herstellung |
GB1427008A (en) * | 1972-06-22 | 1976-03-03 | Brockhouse Steel Structures Lt | Construction of lattice beams |
DE2947748C2 (de) * | 1979-11-27 | 1983-02-03 | Norddeutsche Filigranbau Von Weiler Kg, 3071 Leese | Verschweißter Fachwerkträger |
-
1982
- 1982-02-01 DE DE3203245A patent/DE3203245C2/de not_active Expired
-
1983
- 1983-01-28 EP EP83100828A patent/EP0086993B1/fr not_active Expired
- 1983-01-28 AT AT83100828T patent/ATE19666T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE3203245C2 (de) | 1984-05-30 |
DE3203245A1 (de) | 1983-08-11 |
EP0086993A1 (fr) | 1983-08-31 |
ATE19666T1 (de) | 1986-05-15 |
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