WO2005042869A1 - Cold-formed steel joists - Google Patents
Cold-formed steel joists Download PDFInfo
- Publication number
- WO2005042869A1 WO2005042869A1 PCT/CA2004/001889 CA2004001889W WO2005042869A1 WO 2005042869 A1 WO2005042869 A1 WO 2005042869A1 CA 2004001889 W CA2004001889 W CA 2004001889W WO 2005042869 A1 WO2005042869 A1 WO 2005042869A1
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- WIPO (PCT)
- Prior art keywords
- joist
- web
- chord member
- chord
- members
- Prior art date
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Classifications
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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
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
- E04C3/065—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web with special adaptations for the passage of cables or conduits through the web
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D47/00—Making rigid structural elements or units, e.g. honeycomb structures
- B21D47/01—Making rigid structural elements or units, e.g. honeycomb structures beams or pillars
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- 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
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- 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
- E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
- E04B5/36—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor
- E04B5/38—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor with slab-shaped form units acting simultaneously as reinforcement; Form slabs with reinforcements extending laterally outside the element
- E04B5/40—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor with slab-shaped form units acting simultaneously as reinforcement; Form slabs with reinforcements extending laterally outside the element with metal form-slabs
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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
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
- E04C3/07—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web at least partly of bent or otherwise deformed strip- or sheet-like material
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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
- E04C3/04—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
- E04C3/083—Honeycomb girders; Girders with apertured solid web
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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
- E04C3/04—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
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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
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C3/11—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with non-parallel upper and lower edges, e.g. roof trusses
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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
- E04C3/291—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures with apertured web
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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
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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
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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
- E04C2003/026—Braces
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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
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
- E04C2003/0413—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section being built up from several parts
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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
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
- E04C2003/0452—H- or I-shaped
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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
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
- E04C2003/046—L- or T-shaped
Definitions
- This invention relates to cold-formed steel joists and to assemblies of such joists to provide structural support for floors and roofs in the building construction industry, such as support including fire rated steel-concrete composite structures. Both top chord and bottom chord supported joists are included as aspects of the said invention.
- Joists are commonly used in the construction industry to, span a distance between opposing walls and provide a structural support for a floor, roof or the like. Joists can be comprised of a variety of materials including softwood, wood based laminates, and metal, particularly steel.
- Steel joists can be constructed in an open web configuration, which generally consists of spaced apart upper and lower chord members which extend longitudinally thereof and are fastened together by a zig-zag web.
- Such open web joists are typically manufactured from hot-rolled steel structural members namely the upper and lower chords and the webs.
- the webs typically can be comprised of hot-rolled steel rods, which are formed into a zig-zagged pattern and welded to the upper and lower chords. Integral parts of the web are the end angled supports that connect the ends of the lower chord to the upper chord to counter load stresses at the ends of the joist.
- Open web joists are normally top chord bearing meaning that they are supported by the underside of the top chord, so that the top chord extends longitudinally beyond the bottom chord and the end angle supports to provide bearing interface with the opposing walls.
- Open web joists are by their nature highly customizable in terms of their load bearing capabilities. Both chords and the zig-zag web can be made from different thickness of steel, and the members constituting the zig-zag web can vary in thickness along the length of the joist.
- the webs are open in the sense that there is a space between the rods longitudinally along the central web section that can receive utilities such as wires, pipe work, air ducts or the like.
- Open web joists can be concentric, meaning that the load being supported exerts forces that substantially pass through the centres of gravity of the joists. If the joists are loaded otherwise, they are termed eccentric.
- the joist industry has introduced various types of composite steel-concrete non- combustible floor and roof systems for the construction industry, in whch the top chords are embedded into a concrete slab, such a slab having both load bearing and fire resistant properties.
- Examples of composite joists can be found in U.S. Patent Nos. 5,941 ,035, 4,741 ,138, 4,454,695 and U.S. Publication No. 2002/0069606 A1.
- a composite joist design permits the top chord member of a joist to be designed with less steel in comparison with non-composite systems since the concrete slab when properly bonded to the upper steel joist provides additional load support for the floor or roof system.
- camber (defined as a slight arch added to the joist) has been introduced into the open web joist technology to offset the deflection associated with dead loads such that only the live load deflection of the joist needs to be accounted for in designs of the joist.
- large machines or jigs are needed to impart the camber to the chords of the joist where typically the web resists the cambering process.
- hot-rolled open web joists are typically coated or finished with a coloured primer.
- Steel joists manufacturers typically use large tanks of paint into which completed welded joist assemblies are dipped to receive a coating of primer paint.
- the process has become more expensive due to environmental considerations when using dipped tanks containing volatile solvents.
- Joists in the prior art are produced by cold-forming a single piece of sheet metal into a joist comprising a top chord, a web and a bottom chord forming a continuous single structure, and are predominately used in bottom chord bearing conditions. These joists are generally eccentric in that the load forces do not pass through the centre of gravity of the joist.
- the most common example from prior art is the C-shaped joist which has a cross sectional profile like the letter C.
- Other examples of cold rolled constructions are shown in U.S. Patent Publication Nos. 2002/0020138 A1 and 2003/0084637 A1.
- Composite fire rated floor structures constructed using cold-formed joists are commercially available. Examples are Hambro D510 and Speed Floor both of which have end attachments that are welded, bolted or screwed onto a single strip cold-formed section to provide a top chord bearing joist. However these provide only limited load capacity due to the nature of the localized connection of the end attachments to the cold-formed joist member. Further, they are costly to produce. Cold-formed joist manufacturers provide holes longitudinally along the central web section that are sized to receive utilities for follow-up trades. Since cold-formed joist material can be pre-finished (i.e. the coils of steel can be galvanized or painted) the manufacturing process is less harmful to the worker and environment than the open web coating process described above.
- chords and the web may be of different thickness and the web member thickness may be varied over the span length in response to loading requirements.
- a joist and method of producing said joist that can utilize the beneficial attributes while avoiding the drawbacks from each of the open web joist technology and cold-formed joist technology is desirable. Further, it is desirable to manufacture the joist using automated cold-forming methods as opposed to the labour intensive welding and handling methods employed in open web steel joist construction. It is also desirable to have cost effective fire rated composite floors and roofs based on cold- formed steel joists integrally attached to a concrete slab.
- both open web and cold-formed steel joist floor and roof structures normally require bridging systems, comprising steel members spanning the gap between joists in a floor or roof assembly, to stabilize the assembly from any lateral movement or rotational movement about the longitudinal direction in response to applied loading. It is common practice to weld bridging in place between open web joists, while cold-formed joist systems have bridging structures that commonly use screws or welding for fastening. Consequently a cost effective means to provide bridging between joists is highly desirable.
- a joist comprising at least one elongate chord member, each chord member cold-formed from a unitary piece of sheet steel, the chord member having a flange portion and a web receiving portion orthogonal thereto and the web receiving portion having two web receiving tabs; and a generally planar steel web attached to the web receiving portion between the two tabs.
- such joist may be concentric or substantially concentric to provide improved stability.
- a support system may form part of a composite floor system.
- each joist including an upper elongate chord member formed from a unitary piece of cold-formed steel and having flange portion and a concrete engaging portion extending upwardly therefrom and the concrete engaging portion having two thicknesses of steel; a deck resting on the upper chord member; and a concrete slab disposed on the upper chord of the plurality of joist and the deck with the concrete engaging portion of the upper chord embedded in the concrete slab to define the composite floor.
- the said web may be replaced by a segmented web, comprised of segments which may be cold-formed from different thicknesses of sheet steel fastened together.
- Another aspect of this invention is to provide bridging means comprising bridging members and receiving holes in the joists such that said members may be snap fastened to the said joists without the use of tools.
- Another aspect of this invention resides in a method of producing a joist comprising the steps of; cold-forming an upper chord member from sheet steel, the upper chord member having a flange portion and a web receiving portion orthogonal thereto and the web receiving portion having two tabs; forming at least one web member from sheet metal; and fastening the web between the two tabs of the web receiving portion of the chords with mechanical fasteners.
- Fig. 1 illustrates a prior art open web steel joist (OWSJ);
- Fig. 2 illustrates a prior art cold-formed C-shaped joist
- Fig. 3 illustrates one embodiment of the invention, a concentric top chord bearing segmented web steel joist
- Fig. 4 illustrates segments of a segmented web
- Fig. 5 is a perspective view of a second embodiment of the invention showing a concentric top chord bearing, cold-formed joist having three web segments;
- Fig. 6 is a side elevation view of Fig. 5;
- Fig. 7 is a cross sectional view along the line 7-7 of Fig. 5;
- Fig. 8 illustrates a side-view of a plurality of joists having bridging members
- Fig. 9 is a side elevation view of a plurality of joists having both horizontal bridging and crossed bridging members;
- Fig. 10 is a perspective view of a concentric top chord bearing segmented web cold-formed joist to be used in a composite floor or roof structure;
- Fig. 11 is a side elevation view of Fig. 10;
- Fig. 12 is a cross sectional view along the lines 12-12 of Fig. 10 and also showing a concrete slab attached thereto;
- Fig. 13 is a side elevation view of a composite floor system having a plurality of joists;
- Fig. 14 and enlargement 14a are perspective views showing a bottom chord bearing version of another embodiment of the invention;
- Fig. 15 is a perspective view showing a top chord bearing version of another embodiment of the invention;
- Fig. 16 is a cross sectional view of the web only through line 16-16 of Fig.
- Fig. 17 is a cross sectional view of the web only along the line 17-17 of
- Fig. 18 is a partial side elevation view of a segmented web
- Fig. 19 is a top view of Fig. 18;
- Fig. 20 is a top expanded view of region 20-20 in Fig. 18 showing a rivet joining two segments of a web;
- Fig. 21 is a partial side elevation view of the reinforcing member 84 shown in Fig. 5;
- Fig. 22 is a partial view of Fig 21 ;
- Fig. 23 is a partial top plan view of the reinforcing member. Clarify this drwg
- Fig. 24 is a cross-sectional view of further embodiments of the joist wherein the web and the bottom chord are cold-formed from the same sheet of steel
- Fig. 25 is a cross-sectional view of further embodiments of the joist wherein the web and the bottom chord are cold-formed from the same sheet of steel
- Fig. 26 and enlargement 26a are perspective views of a bottom chord bearing composite version of another embodiment of the invention.
- Fig. 27 is a perspective view of a top chord bearing composite version of another embodiment of the invention.
- Fig. 28 is a schematic view of an automated assembly line for the manufacture of cold-formed joists
- Fig. 29 is a cross section view through the line 116 - 116 of Fig.14;
- Fig. 30 is a side elevation view of an embodiment of one end of a bottom chord bearing composite cold-formed joist bonded to a concrete slab and integrated into a side wall;
- Fig. 31 is a partial enlarged view of Fig 30;
- Fig. 32 is a cross sectional view through line 112 - 112 of Fig. 26;
- Fig .33 is a side elevation view of a plurality of another embodiment of the invention with horizontal bridging between joists;
- Fig. 34. is a side elevation view of a plurality of another embodiment with diaphragm bridging
- Fig. 35 is a side elevation view of one end of a bottom chord bearing cold- formed joist supported by a foundation wall and supporting a stud wall;
- Fig. 36a is a top plan view of the reinforcing flap of figure 35;
- Fig. 36b is a perspective view of the reinforcing flap of figure 35;
- Fig. 37 shows top and plan views of a further reinforcing flap of figure 35;
- Fig. 38 is a bottom chord bearing embodiment of the invention illustrating the reinforcing end flaps
- Fig. 39 is a side elevation view of Fig. 38.
- Fig. 40 is a cross sectional view of an alternate embodiment of a cold formed joist in a composite floor or roof structure
- Fig. 1 illustrates a prior art open web joist construction 2 consisting of an upper chord assembly 4 spaced from a lower chord assembly 6. The chords are joined together by a zigzag web 8 which is generally connected to the upper and lower chord assemblies 4, 6 by a number of means including welding or the like.
- Fig. 2 illustrates a prior art cold formed joist construction 10 roll-formed from a single strip of light gauge steel, having a web portion 12 having a plurality of holes 14 disposed therethrough for receiving utilities such as wire or the like, and having upper and lower chords 11 and 13 respectively.
- Figs. 3 and 5 illustrate two similar embodiments of the invention, namely top chord bearing concentric joists, which comprise an assembled joist 20 having a first or upper chord member 22 spaced from a second or lower chord member 24.
- a steel web member 26 is also disclosed.
- the web member 26 is fastened to the upper and lower chord members 22 and 24 by fastening means 28.
- the fastening means can comprise of a variety of fastening means such as bolts and nuts, screws, welding or spot clinches (not shown) or rivets 30 as shown in Fig.7
- the upper and lower chord members 22 and 24 are produced from single sheets of steel.
- the joist can be formed in a concentric fashion as shown in Fig. 7 where the upper and lower chord members 22 and 24 are substantially symmetrically disposed about web 26.
- the upper chord member 22 is cold-formed to present a substantially flat upper load bearing surface 34 which is formed as shown in Fig. 7 to present lower load bearing wings or extensions 36 and 38.
- the upper load bearing surface 34 is in contact with the lower load bearing extensions 36 and 38 so as to produce a rigid and structurally solid member which may be fastened together by the spot clinch 32.
- the spot clinch process is conducted in the manner well known to those persons skilled in the art and generally consists of a mechanism which pushes material by a plunger (not shown) to present a mushroomed head 40 as shown so as to secure the members together.
- the upper load bearing surface 34 and lower load bearing extensions 36 and 38 are disposed in this case symmetrically about the web 26 ,the direction of which defines the "Y" axis 27 as shown in Fig. 7. Accordingly, the upper load bearing surface 34 in concert with the lower load bearing extension 36 on one side of the axis 27 defines a horizontal extension 42 while the upper load bearing surface 34 to the right of the Y axis 27 in concert with the lower load bearing extension 38 defines a horizontal extension 44 disposed on the other side of the axis 27.
- the lower load bearing extensions 36 and 38 are cold-formed spaced apart web receiving tabs 46 and 48 as shown.
- the upper portion 50 of the web 26 may include a plurality of holes 52 which are adapted to receive the fastening means 28.
- Fig, 7 shows an example of a fastening means 28 comprising a rivet 30 that fastens the web 26 to the upper chord 22 at the tabs 46 and 48.
- the spot clinches 32 in combination with the cold-formed chords connect the two folded portions 34 and 36 and 34 and 38 to reduce the width to thickness ratio of the section to avoid local buckling.
- the spot clinch 32 in combination with the cold work forming increases the yield strength of the steel part.
- the lower chord 24 is similarly constructed by forming sheet metal to present a lower chord surface 54 bent so as to present lower chord extensions 56 and 58 symmetrically disposed about axis 27.
- the lower chord 54 with the lower chord extensions 56 and 58 define lower chord horizontal extensions 60 and 62 in this case symmetrically disposed about the web 26.
- the lower chord extensions 56 and 58 present two spaced apart web receiving tabs 64 and 66 which are adapted to receive the lower portion 68 of the web 26.
- the lower chord is also fastened to the lower part of the web 26 by rivets or other means
- the web 26 can include a plurality of utility holes 72 which provide an access for utilities such as electrical wires, air ducts or the like.
- the holes 72 as shown are circular although any configuration can be produced including square holes or the like.
- the holes 72 can include a cold-formed lip 74 as shown in Fig. 16. The holes 72 lighten the total weight of the joist 20 while the cold-formed lip 74 adds rigidity to the web structure 26 particularly in the direction of the "Y" axis 27.
- the web 26 may also include a plurality of stiffening means 80 to stiffen of the web member 26.
- the stiffening means 80 comprises a first stiffening means 82 and a second stiffening means 84.
- the first stiffening means 82 generally consists of the ends of the web segment 26 being bent to form a stiffening tab 82 which is disposed at approximately a 90 degree angle from the web 26.
- the second stiffening means 84 may consist of a hollow embossed rib structure 86 as illustrated in Fig. 21.
- the hollow rib structure 86 can be produced by a variety of means and in one example is produced by a punch (not shown) which pushes the web material 26 to present the stiffening structure 84 .
- the stiffening structure has two spaced side walls 88 and 90 as well as upper and lower walls 92 and 94 and stiffening front wall 96.
- the stiffening front wall 96 has stiffening holes 98 which are adapted to receive bridging members 170 and 171 in a manner to be more fully particularized herein.
- the web 26 can comprise a plurality of web segments 104, 106 and 108, as shown in Fig. 4, in which, as an example, three segments are shown.
- Each of the web segments 104, 106 and 108 are adapted to be fastened to one another.
- the web segments 104, 106, 108 include a first stiffening means 82 which comprise sheet metal flaps which are bent at substantially 90 degrees from the web material 26.
- the first stiffening flaps 82 may include a plurality of holes 110 which are adapted to receive fasteners such as rivets, nuts and bolts, or may receive spot clinches to secure the plurality of web segments 104, 106, and 108 together to form a web 26.
- the web segments 104, 106, and 108 also include second stiffening means 84, shown in figure 3.
- the web segments can either all have the same thickness or have different selected thickness.
- the web segments can be thicker at the ends of the joist than segments in the middle of the joist since the shear stresses under load are greater at the ends than in the middle.
- the joist shown in Figs. 3 and 5 include angled end support members 140 that secure the ends of the lower chord 24 and upper chord 22.
- a structural assembly comprising a plurality of joists 20 partially shown at Figs. 8 and 9 can define a supporting surface 160 to support a platform 162 such as a roof or floor.
- Each of the joists 20 as shown in cross section comprises spaced apart cold-formed steel upper and lower chord members 22 and 24 and a steel web 26 intermediate between upper and lower chord members 22 and 24.
- Fasteners 28 are utilised to fasten the web to the upper and lower chords and the top surface of upper chords 22 define the supporting surface160.
- a plurality of bridging members 170 and 171 may be used to connect adjacent joists 20 together as shown so as to stiffen the said joist assembly.
- Parallel bridges 170 may be used as shown in Fig. 8, or may be accompanied by crisscrossed bridges 171 that are appropriately fastened to the horizontal bridges 170 at 173 as shown in Fig. 9.
- the fastening of the bridges 170 to the joists 20 through holes in the embossed features 84 is shown in greater detail in Figs.21, 22 and 23, effectively creating a snap in place connection without the use of tools.
- the bridge members such as 170 may be formed in an L-shaped cross section from sheet steel to produce a first surface 172 and a second surface 174.
- the second surface 174 is slotted at 176 as shown and the width W of surface 174 is less than the depth D of the hole 98 to permit the end 178 of the bridging member 170 to be inserted into the hole 98 and then rotated so as to lock the edges of the slot 176 against the reinforcement face 96 adjacent the hole 98.
- Criss-crossed bridging members 171 may then be added and fastened as shown in Fig. 9.
- Figs. 12 and 13 illustrate another embodiment of the invention defining a composite floor or roof structure.
- the upper chord 22 can be cold- formed so as to present horizontal extensions 190 symmetrically disposed about the central web 26 and presents spaced apart vertical extensions 192 and 201 adapted to receive the top portion 50 of the web 26 to define a vertical extension 194.
- a rivet 196 may be utilized to fasten the upper chord 22 to the web 26 as shown.
- a steel deck 198 is adapted to rest on the top surface of the horizontal upper chord extensions 190 as shown in Figs. 12 and 13.
- a wire mesh 205 is added.
- concrete 206 can be poured onto the deck 198 so as to produce a floor or ceiling.
- the vertical extension 194 can also include a generally horizontal concrete engaging extension 202 that runs along the length of the chord 22. Since the horizontal concrete engaging extension 202 runs along the length of the chord 22, the possibility of snagging a worker's foot or clothing is minimized thereby adding to the safety feature of the joist prior to pouring of the concrete 206 over the deck 198.
- the shear bond between the extensions 194 and 202 and the concrete may be increased by using rivets spot clinches or the like to increase the surface area of contact between the concrete and the top chord.
- this embodiment of the joist is substantially concentric since the extensions 194 and 202 are bonded to the concrete and the steel-concrete composite effectively distributes the applied load to each joist through its centre of gravity
- Fig. 24 illustrates another embodiment of the invention which includes an upper cold-formed steel chord 22 fastened to a steel web 26 by fasteners 30.
- the bottom chord 24 is a cold-formed extension of the web formed so as to present a horizontal extension 250 and 252 which may be of double thickness as shown and may be hole clinched (not shown) and may be disposed symmetrically or asymmetrically about the plane of the web.
- Fig. 25 illustrates another embodiment of the invention, similar that shown in fig. 24 where the upper chord 22 has a single layer of sheet metal which is bent to produce the horizontal extensions 190 spaced apart to accommodate the end 50 of web 26 so as to define an upper vertical extension 194 having a horizontal concrete engaging extension 202.
- the horizontal concrete engaging extension 202 can include a plurality of hole clinches to further strengthen the bond between the concrete and the upper chord 22 and thereby increase the shear strength of the composite.
- the bottom chord being a cold-formed extension of the web, may have different forms being symmetric or asymmetric about the web axis, and in parts being of different multiples of the web thickness.
- the joist 20 can be supported along the bottom chord 24 as shown in Figs. 30 and 31 illustrating a bottom chord bearing composite joist embodiment 20 supported by the bottom chord 24.
- the ends 400 of the joist are disposed within the lower stud wall 402 and upper stud wall 404 as shown.
- the lower stud wall 402 includes a stud wall track 406 which is generally a flat piece of sheet steel 408 bent at its ends so as to present a solid surface to the joist.
- the upper stud wall 404 includes a similar stud wall track 406.
- the stud walls 402 and 404 also includes a floor joist track 412 adjacent the end 400 of joist 20.
- the view of the joist 20 seen in Fig. 30 can have a number of configurations as described in the context of the composite joist including that shown in Figure 12.
- the composite joist is constructed in the manner previously described.
- An erection clip 414 can be utilized so as to locate the joist 20 prior to pouring the concrete to produce the composite joist.
- the erection clip 414 comprises a general J-shaped clip in cross-section which is secured to the bottom of the stud wall track 406 and extension 202.
- FIG. 35 together with the enlargements depicted in Figs. 36a and 36b, illustrates another bottom chord bearing embodiment of the invention supported by the foundation walls and supporting the stud walls in a residential home.
- the joist 20 rests on a foundation 401 having a bearing support 410.
- the end 400 of the joist 20 includes a reinforcing flap 82, which provides support against the compressive forces arising from loads applied through the stud wall 404, and is further particularized in Fig. 36a and 36b.
- the flap 82 is cut along cut lines 600, 602 and 604 so as to present portions 620 and 622.
- portions 620 and 622 are folded along fold lines 606 and 608. Thereafter portions 620 and 622 are further folded along fold lines 621 and 623 so as to present wing portions 624 and 626 which are adapted to contact respectively the lower surface of upper chord member 22 and upper surface of lower chord member 24 as best shown in Fig. 35.
- Fastening means may be utilized to fasten the reinforcing wings 624 and 626 to upper and lower chord members 22 and 24 so as to further rigidity and strengthen the joist 20.
- Wooden or metal backing plates 412 are also utilized as shown in Fig. 35. Wooden pieces 414 may also be disposed as shown.
- the upper chord 22 provides a support surface for supporting plywood 416 or the like.
- Further end reinforcing members 700 may be utilized which comprises an elongated section of sheet metal having web contacting portions 702 and rigidifying portions 704 extending generally perpendicular to the web contacting portions 702. The ends of the rigidifying portions 704 are bent at 706 and 708 and adapted to contact the upper chord 22 and lower chord 24 respectively. Furthermore fastening means may be utilized to fasten the rigidifying section 700 to web 26 and upper and lower chords 22 and 24.
- Fig. 38 illustrates an embodiment of a bottom chord bearing cold- formed joist utilizing the reinforcing structure 700 shown in Fig. 37.
- Fig. 28 generally illustrates a method of producing the said embodiments of the cold-formed joist.
- the upper chord 22 can be produced by unrolling a coil of sheet steel 112 along path 114 to a roll forming machine 116 such as sold by Samco machinery located in Toronto, Canada.
- the roll forming machine 116 can include a station to flatten and cut a selected length of the upper chord member 22.
- the lower chord member 24 can be produced by unrolling a coil of sheet steel 118 and flattening same along a path 120 to a roll forming machine 116 and then cutting to the desired length.
- the web 26 can also be produced by unwinding a coil of sheet steel 122 and flattening same at flattening station 123.
- a shear 125 can be used to shear the web member 26 to its desired length. Thereafter, the web 26 approaches stiffening section 128 so as to produce the first and second stiffening means 82 and 84 as described.
- the shear 125 can be used to produce the plurality of segmented webs 104, 106 and 108. Each web segment 104, 106, 108 can have the left hand and right hand stiffening flaps 82 produced by stiffening station 130 and 132.
- An appropriate punch 133 is used to produce the second stiffening means 84 as described above in a drawing operation. As well, punch 133 is used to produce holes 72 and area embossments 184.
- the sheet steel at stations 112, 118 and 122 can be galvanized or painted as desired prior to the forming process.
- the roll forming machine 116 may include punches to punch the appropriate holes 52 in the upper and lower chord members 22 and 24 so as to accommodate the appropriate fastening means 28.
- the roll forming machine 116 can include apparatus to spot clinch 32 the members together.
- the joist fabricated herein can be coated with a variety of paint colours which are painted prior to fabrication so as to produce a variety of joists having different colours and avoiding the dip painting characteristic of open web joist construction.
- the invention as described herein presents a number of advantages over the prior art.
- many open web steel joists in the prior art include a cambering of the upper and lower chords 4 and 6 so as to present a slight arch to increase load bearing capabilities of the joist.
- Such prior art cambering techniques required working against the web during the cambering process.
- Applicant's invention presents an advantage since the upper and lower chord members 22 and 24 can be cambered individually and separately from the web 26.
- a top chord 22 and a bottom chord 24 are attached by web receiving tabs to a generally planar web 26 that defines a Y-axis 27 of the joist by self piercing rivets 30 or other fastening means such as screws or rivets.
- Said web has longitudinally spaced holes 72 formed therein each with a cold-formed lip 74 for increased rigidity under load to allow the routing of pipes, wiring, ductwork and such of other trades.
- Further web stiffening may be provided by cold-formed area embossments 184 as shown disposed along the length of the web at locations chosen to counteract applied loads or may be provided by vertical stiffening embossments such as 84 as previously described.
- embossed plates 101 attached by fasteners 130 to the end portions of the web, and are sized to counter both compressive and shear stresses near the ends of the joist.
- embossed plates may be fastened on both sides of each end of the joist, and may terminate longitudinally in cold-formed flaps 182 that provide increased stiffness and provide a means of attaching joists at their ends.
- top chord 22 and the bottom chord 24 of this embodiment may be simplified compared with previously described embodiments. However additional features to those shown previously in Fig.7 say are disclosed.
- the web receiving tabs 46 and 48 of the top chord are shown extended and cold-formed to provide outward protruding inner flanges 45 and 47 respectively disposed generally orthoganally to the web 26.
- Said flanges contribute to the overall strength of the joist; and said flanges are formed with holes 198 regularly spaced along the length of the chord and designed to receive snap-in bridging members as shown in Figs. 33 and 34.
- the bottom chord 24 also shows inner flanges 65 and 67 as cold-formed extensions to the receiving tabs 64 and 66.
- Fig. 29 also serves as a cross section view of a top chord bearing version of this embodiment shown in perspective in Fig.15
- FIG. 32 Perspectives of bottom and top chord bearing composite joist versions of this embodiment are shown in Figs. 26, 26a and Fig.27, and a cross section view through line 112-112 is shown in Fig. 32.
- top chord 22 is attached to the web 26 by fastening tabs 192 and 201 of vertical section 194 by self piercing rivets 196 or other means.
- the double thickness of steel forming horizontal extension 202 are fastened by rivets 199 as shown or by other fastening means, with the head of said rivet disposed above the top surface of extension 202 in order to increase the surface area on the top surface of extension 202 and so enhance shear bonding with concrete.
- the bottom chord inner flanges 65 and 67 are formed with regularly spaced holes 198 to receive snap-in bridging members as shown generally in Figs. 33 and 34.
- Joist 700 includes a top chord 22 and does not include a web or a bottom chord. It will be appreciated by those skilled in the art that this joist would only have application in relatively short spans.
- Joist 700 includes a concrete engaging extension 202 which includes a vertical extension 194 that extends upwardly from horizontal upper chord extensions 190.
- steel deck 198 is adapted to rest on the top surface of the horizontal upper chord extensions 190.
- a wire mesh 205 is added and thereafter concrete 200 is poured onto the deck 198.
- a structural assembly comprising a plurality of joists 20 partially shown at Fig. 33 can define a supporting surface 160 to support a platform 162 such as a roof or floor.
- Each of the joists 20 as shown in cross section comprises of spaced cold- formed steel upper and lower chord members 22 and 24 and a steel web 26 fastened between upper and lower chord members 22 and 24.
- a plurality of bridging members 170 is used to stiffen the assembly 20, said bridging members being disposed parallel to the support surface; and said flanges may be connected to adjacent joists at the holes 198 provided by the inner flanges 45 and 47 of the top chord 22 and by the inner flanges 65 and 67 of the bottom chord 24.
- Bridging members may be constructed from a length of steel of angled cross section terminated at each end by a feature 270 that fits the holes 198 and allows the bridging member to be snap fastened to inner flanges of adjacent joists.
- FIG. 34 A further aspect of this invention is illustrated in Fig. 34 partially showing a structural assembly of joists 20 defining a support surface 160 supporting a platform 162 such as a floor or roof when both parallel and criss-cross bridging is required.
- a diaphragm assembly 370 comprising a steel plate 470 affixed by fasteners 670 to upper and lower bridging members 170 each terminated by a snap-in feature 270 at either end.
- Said steel plate may provide a hole 570 having a cold-formed lip to allow the passage of wiring, pipes and ducting from other trades.
- Diaphragm assembly 370 providing both parallel and criss-cross bridging may be snap-fastened to adjacent joists by engaging the snap-in feature 270 with the holes 198 provided in the inner flanges of the upper and lower chords.
- Figs. 33 and 34 advances the prior art by substantially reducing the labour and cost involved in the manual assembly of bridging on the construction site.
- Figs. 33 and 34 refer to conventional floor or roof structures, the same bridging means may be used without any loss of generality to the construction of composite steel-concrete floors and roofs.
- the support structures described in this invention can be utilized either as floor joists or roof joists for single family residential, multi-family residential, commercial or industrial building construction. Further it will be appreciated by those skilled in the art that the system described herein may be used as a stay in place forming system. Analysis and testing of said structures demonstrate that the prior art is advanced in several regards including: - more economical bottom chord bearing cold-formed steel joists with spans up to 40 feet - more economical top chord bearing joists capable of mass manufacture and customization - more effective and economical composite floor and roof structures.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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AU2004286000A AU2004286000B8 (en) | 2003-10-28 | 2004-10-28 | Upper Chord Bearing Cold-Formed Steel Joists |
EP04789796A EP1687496A4 (en) | 2003-10-28 | 2004-10-28 | Cold-formed steel joists |
CA002542848A CA2542848C (en) | 2003-10-28 | 2004-10-28 | Upper chord bearing cold-formed steel joists |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US60/514,622 | 2003-10-28 | ||
US10/721,610 US20050108978A1 (en) | 2003-11-25 | 2003-11-25 | Segmented cold formed joist |
US10/721,610 | 2003-11-25 |
Publications (1)
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WO2005042869A1 true WO2005042869A1 (en) | 2005-05-12 |
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PCT/CA2004/001889 WO2005042869A1 (en) | 2003-10-28 | 2004-10-28 | Cold-formed steel joists |
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US (1) | US20050108978A1 (en) |
CA (1) | CA2667892C (en) |
WO (1) | WO2005042869A1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009124356A1 (en) * | 2008-04-11 | 2009-10-15 | Qld Steel Pty Ltd | Structural building components and method of constructing same |
WO2011054094A1 (en) * | 2009-11-09 | 2011-05-12 | Best Joist Inc. | Unitary steel joist |
WO2011123953A1 (en) * | 2010-04-08 | 2011-10-13 | Dizenio Inc. | Cold formed joist |
US8683774B2 (en) | 2006-05-18 | 2014-04-01 | Paradigm Focus Product Development Inc. | Light steel structural member and method of making same |
US8943776B2 (en) | 2012-09-28 | 2015-02-03 | Ispan Systems Lp | Composite steel joist |
US8950151B2 (en) | 2008-09-08 | 2015-02-10 | Ispan Systems Lp | Adjustable floor to wall connectors for use with bottom chord and web bearing joists |
EP2556200B2 (en) † | 2011-06-03 | 2018-01-10 | Knauf International GmbH | Open web grid runner |
US9975577B2 (en) | 2009-07-22 | 2018-05-22 | Ispan Systems Lp | Roll formed steel beam |
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US10280615B2 (en) | 2016-05-11 | 2019-05-07 | Ispan Systems Lp | Concrete formwork steel stud and system |
US11459755B2 (en) | 2019-07-16 | 2022-10-04 | Invent To Build Inc. | Concrete fillable steel joist |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2578884A1 (en) * | 2006-02-17 | 2007-08-17 | Norco Industries, Inc. | Trailer and method of assembly |
PL2915607T3 (en) * | 2014-03-04 | 2019-11-29 | Fontaine Holdings Nv | Galvanized metal objects and their manufacturing process |
US9708816B2 (en) | 2014-05-30 | 2017-07-18 | Sacks Industrial Corporation | Stucco lath and method of manufacture |
US9657477B2 (en) * | 2015-06-19 | 2017-05-23 | C Douglas Davis | Structural support beam |
US9752323B2 (en) | 2015-07-29 | 2017-09-05 | Sacks Industrial Corporation | Light-weight metal stud and method of manufacture |
US9797142B1 (en) | 2016-09-09 | 2017-10-24 | Sacks Industrial Corporation | Lath device, assembly and method |
US10611453B2 (en) | 2017-06-07 | 2020-04-07 | The Boeing Company | Swing-link trunnion truss mount |
JP7055465B2 (en) | 2017-08-14 | 2022-04-18 | ストラクタ ワイヤー ユーエルシー | Variable length metal stud |
WO2019034224A1 (en) * | 2017-08-18 | 2019-02-21 | Knauf Gips Kg | Frame, basic framework, module, profile and set of structural elements for modular construction and a modular-construction building |
US11351593B2 (en) | 2018-09-14 | 2022-06-07 | Structa Wire Ulc | Expanded metal formed using rotary blades and rotary blades to form such |
USD949442S1 (en) * | 2019-04-23 | 2022-04-19 | Epic Metals Corporation | Roofing deck |
US11866938B2 (en) * | 2021-08-30 | 2024-01-09 | Claudio Zullo | Truss |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2108373A (en) | 1936-12-31 | 1938-02-15 | Gerald G Greulich | Welded structural member |
CA900687A (en) | 1970-01-13 | 1972-05-23 | H. Atkinson Archibald | Structural chord members for joist construction |
CA1172463A (en) | 1983-01-17 | 1984-08-14 | Felix Laurus | Double top chord |
CA2412726A1 (en) * | 2000-06-27 | 2002-01-03 | Nci Building Systems, L.P. | Structural member for use in the construction of buildings |
Family Cites Families (94)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US827628A (en) * | 1906-04-28 | 1906-07-31 | Lonzo V Greene | Safety block-signal. |
US1360720A (en) * | 1919-12-24 | 1920-11-30 | Brown Edward Eugene | Metal construction |
US1622559A (en) * | 1925-05-25 | 1927-03-29 | Gabriel Steel Company | Metallic joist |
US1915424A (en) * | 1928-03-14 | 1933-06-27 | Mcclintic Marshall Company | Metallic joist |
US1918345A (en) * | 1928-08-22 | 1933-07-18 | Mcclinticmarshall Company | Joist, beam, girder, and the like |
US1974730A (en) * | 1931-09-17 | 1934-09-25 | Zollinger Fritz | Steel girder for concrete structures |
US1983632A (en) * | 1931-11-19 | 1934-12-11 | William B Miller | Truss type joist |
US2169253A (en) * | 1934-12-20 | 1939-08-15 | Ferrocon Corp | Building structure and parts therefor |
US2246215A (en) * | 1938-07-01 | 1941-06-17 | Reliance Steel Prod Co | Structural unit |
US2256812A (en) * | 1939-10-06 | 1941-09-23 | William B Miller | Method of fabricating joists |
US2514607A (en) * | 1946-02-07 | 1950-07-11 | Dravo Corp | Truss construction |
US2457250A (en) * | 1948-05-03 | 1948-12-28 | Macomber Stanley | Tubular section structural member |
US2630890A (en) * | 1948-10-07 | 1953-03-10 | Macomber Stanley | Multiple tubular section structural member |
US2662272A (en) * | 1949-02-15 | 1953-12-15 | Macomber Inc | Manufacture of fabricated joists |
US2624430A (en) * | 1949-06-18 | 1953-01-06 | Macomber Inc | Fabricated joist |
US2860743A (en) * | 1955-02-01 | 1958-11-18 | Cliff William | Open web metal joist |
US2864471A (en) * | 1956-02-23 | 1958-12-16 | Central Texas Iron Works | Joist construction |
US3158731A (en) * | 1961-01-17 | 1964-11-24 | Dominion Bridge Co Ltd | Light weight trusses and apparatus for the fabricating of same |
US3221467A (en) * | 1963-02-01 | 1965-12-07 | American Metalcore Systems Inc | Structural member |
CH431438A (en) * | 1963-11-18 | 1967-03-15 | Keller Dipl Ing J G Stefan N | Process and system for the fully automatic production of endless lattice girders as well as lattice girders produced according to the method |
US3381439A (en) * | 1965-10-21 | 1968-05-07 | United States Gypsum Co | Structural member |
US3487861A (en) * | 1967-08-29 | 1970-01-06 | Stryco Mfg Co | Truss making and method |
US3945168A (en) * | 1968-11-04 | 1976-03-23 | Hambro Structural Systems Limited | Reusable spanner bar |
US3979868A (en) * | 1968-11-04 | 1976-09-14 | Hambro Structural Systems Ltd. | Composite concrete and steel floor construction |
US3818083A (en) * | 1968-11-04 | 1974-06-18 | Hambro Structural Systems Ltd | Building method |
US3641303A (en) * | 1970-01-26 | 1972-02-08 | Integrated Building Industry I | Method and apparatus for continuously making truss elements |
US3639962A (en) * | 1970-02-11 | 1972-02-08 | Robert M Gooder | System for fabricating structural members |
US3626567A (en) * | 1970-04-28 | 1971-12-14 | Gulf & Western Ind Prod Co | Method and apparatus for manufacturing structural semijoist |
US4041664A (en) * | 1970-05-28 | 1977-08-16 | Davis Jr George Bradley | Joist, structural element and devices used in making same |
US4056908A (en) * | 1975-08-07 | 1977-11-08 | Mcmanus Ira J | Composite concrete slab and steel joist construction |
US4151694A (en) * | 1977-06-22 | 1979-05-01 | Roll Form Products, Inc. | Floor system |
US4159604A (en) * | 1978-01-05 | 1979-07-03 | Anthes Equipment Limited | Joist |
US4207719A (en) * | 1978-04-03 | 1980-06-17 | James Knowles | Composite construction beam |
US4189883A (en) * | 1978-08-04 | 1980-02-26 | Mcmanus Ira J | Composite system for floor frame members |
SE7901731L (en) * | 1979-02-27 | 1980-08-28 | Frelena Ab | BJELKLAG |
US4490958A (en) * | 1979-12-12 | 1985-01-01 | Lowe Colin F | Sheet metal beam |
US4409771A (en) * | 1979-12-12 | 1983-10-18 | Lowe Colin F | Sheet metal beam |
US4548014A (en) * | 1980-03-28 | 1985-10-22 | James Knowles | Metal joist construction |
US4421969A (en) * | 1980-08-20 | 1983-12-20 | Tanenbaum Joseph M | Method for fabricating open web steel joists |
US4385476A (en) * | 1980-09-22 | 1983-05-31 | United States Gypsum Company | Web stiffener for light-gauge metal framing members |
US4476662A (en) * | 1981-10-28 | 1984-10-16 | Fisher James M | Joist girder building construction |
US4454695A (en) * | 1982-01-25 | 1984-06-19 | Person Joel I | Composite floor system |
US4432178A (en) * | 1982-06-01 | 1984-02-21 | Steel Research Incorporated | Composite steel and concrete floor construction |
US4512119A (en) * | 1982-08-13 | 1985-04-23 | Foam-Lag Industries Pty. Ltd. | Apparatus for roof flashing |
GB8302389D0 (en) * | 1983-01-28 | 1983-03-02 | Abacus Municipal Ltd | Column-mounted appliances |
CA1178819A (en) * | 1983-03-11 | 1984-12-04 | Herbert K. Schilger | Composite floor system |
US4688358A (en) * | 1983-05-23 | 1987-08-25 | Madray Herbert R | Construction system |
US4720957A (en) * | 1983-05-23 | 1988-01-26 | Madray Herbert R | Structural component |
US4560381A (en) * | 1983-07-07 | 1985-12-24 | Southwell Sandra R H | Disposable panty for menstrual wear |
US4549381A (en) * | 1983-11-02 | 1985-10-29 | Neal Holtz | Composite joist system |
US4560301A (en) * | 1984-01-03 | 1985-12-24 | Simpson Strong-Tie, Company, Inc. | Heavy slope and skew sheet metal hanger and method of making same |
US4741138A (en) * | 1984-03-05 | 1988-05-03 | Rongoe Jr James | Girder system |
US4837994A (en) * | 1984-07-02 | 1989-06-13 | Consolidated Systems, Inc. | Composite metal/concrete floor and method |
US4845908A (en) * | 1984-07-02 | 1989-07-11 | Consolidated Systems, Incorporated | Composite metal/concrete floor and method |
US4592184A (en) * | 1984-07-16 | 1986-06-03 | Joel I. Person | Composite floor system |
US4691494A (en) * | 1985-06-28 | 1987-09-08 | Gwynne Jacob M | Metal framing system |
US4702059A (en) * | 1986-07-18 | 1987-10-27 | Neal Holtz | Joist system for forming concrete slabs |
US4715155A (en) * | 1986-12-29 | 1987-12-29 | Holtz Neal E | Keyable composite joist |
US4937997A (en) * | 1987-03-30 | 1990-07-03 | Thomas Jr William G | Open web Z-shaped structural metal beam |
ZA884175B (en) * | 1987-06-12 | 1990-02-28 | Jencorp Nominees Ltd | Roof truss and beam therefor |
US4836436A (en) * | 1987-08-17 | 1989-06-06 | Gerald McDonald | Method of manufacturing a fabricated open web steel joist |
US4937998A (en) * | 1988-06-17 | 1990-07-03 | Howard Goldberg | Structural member |
US5004369A (en) * | 1989-06-23 | 1991-04-02 | United Steel Products Co. | Slope and skew hanger |
US5220761A (en) * | 1989-10-25 | 1993-06-22 | Selby David A | Composite concrete on cold formed steel section floor system |
US5553437A (en) * | 1990-05-03 | 1996-09-10 | Navon; Ram | Structural beam |
US5146726A (en) * | 1990-10-26 | 1992-09-15 | Ellison Jr Russell P | Composite building system and method of manufacturing same and components therefor |
WO1992017658A1 (en) * | 1991-04-05 | 1992-10-15 | Jack Slater | Web, beam and frame system for a building structure |
US5214900A (en) * | 1991-05-28 | 1993-06-01 | Cornelius Folkerts | Method and means for supporting overhead joists to create greater headroom |
US5669197A (en) * | 1991-06-03 | 1997-09-23 | Bodnar; Ernest Robert | Sheet metal structural member |
US5207045A (en) * | 1991-06-03 | 1993-05-04 | Bodnar Ernest R | Sheet metal structural member, construction panel and method of construction |
US5240342A (en) * | 1991-10-04 | 1993-08-31 | Kresa Jr Walter | Variable angle joist support |
US5499480A (en) * | 1993-03-31 | 1996-03-19 | Bass; Kenneth R. | Lightweight metal truss and frame system |
US5544464A (en) * | 1994-04-05 | 1996-08-13 | Canam Hambro | Composite steel and concrete floor system |
AUPM648394A0 (en) * | 1994-06-27 | 1994-07-21 | Tubemakers Of Australia Limited | Method of increasing the yield strength of cold formed steel sections |
US5687538A (en) * | 1995-02-14 | 1997-11-18 | Super Stud Building Products, Inc. | Floor joist with built-in truss-like stiffner |
US5771653A (en) * | 1995-10-12 | 1998-06-30 | Unimast Incorporated | Chord for use as the upper and lower chords of a roof truss |
US5921054A (en) * | 1996-06-21 | 1999-07-13 | University Of Central Florida | Metal and wood composite framing members for residential and light commercial construction |
US6484464B1 (en) * | 1997-01-22 | 2002-11-26 | Icom Engineering Corporation | Floor and roof structures for buildings |
US5904004A (en) * | 1997-02-25 | 1999-05-18 | Monosite, Inc. | Integrated communications equipment enclosure and antenna tower |
US5927036A (en) * | 1997-06-30 | 1999-07-27 | Perf-X-Dek, L.L.C. | Floor joist system |
US5941035A (en) * | 1997-09-03 | 1999-08-24 | Mega Building System Ltd. | Steel joist and concrete floor system |
US5865008A (en) * | 1997-10-14 | 1999-02-02 | Bethlehem Steel Corporation | Structural shape for use in frame construction |
US6131362A (en) * | 1998-02-04 | 2000-10-17 | Buecker Machine & Iron Works, Inc. | Sheet metal beam |
US6634153B1 (en) * | 1998-08-31 | 2003-10-21 | Jd2, Inc. | Special moment truss frame |
US6301854B1 (en) * | 1998-11-25 | 2001-10-16 | Dietrich Industries, Inc. | Floor joist and support system therefor |
CA2271403A1 (en) * | 1999-04-22 | 2000-10-22 | Georges Gosselin | Bolted metal joist |
US6263634B1 (en) * | 1999-09-23 | 2001-07-24 | Rotary Press Systems Inc. | Grommet for use with sheet metal structural member |
US20020029538A1 (en) * | 1999-12-31 | 2002-03-14 | Eric Webb | Steel floor truss |
US6964140B2 (en) * | 2000-07-03 | 2005-11-15 | Walker Steven H | Structural metal member for use in a roof truss or a floor joist |
US6571527B1 (en) * | 2000-09-20 | 2003-06-03 | Cooper Technologies Company | Elongate structural member comprising a zigzag web and two chords wherein one chord comprises a channel with inwardly directed lips on the channel ends |
US6415577B1 (en) * | 2000-09-29 | 2002-07-09 | Eaglespan Steel Structures, Inc. | Corrugated web beam connected to a top tube and bottom tube |
US6436552B1 (en) * | 2000-10-16 | 2002-08-20 | Steven H. Walker | Structural metal framing member |
US20020046534A1 (en) * | 2000-10-23 | 2002-04-25 | Heinly John D. | Metal truss system |
US6691487B2 (en) * | 2001-11-08 | 2004-02-17 | Dietrich Industries, Inc. | Apparatus for reinforcing a portion of a metal joist adjacent an opening therethrough and methods for forming reinforced openings in metal support members |
-
2003
- 2003-11-25 US US10/721,610 patent/US20050108978A1/en not_active Abandoned
-
2004
- 2004-10-28 WO PCT/CA2004/001889 patent/WO2005042869A1/en active Search and Examination
- 2004-10-28 CA CA2667892A patent/CA2667892C/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2108373A (en) | 1936-12-31 | 1938-02-15 | Gerald G Greulich | Welded structural member |
CA900687A (en) | 1970-01-13 | 1972-05-23 | H. Atkinson Archibald | Structural chord members for joist construction |
CA1172463A (en) | 1983-01-17 | 1984-08-14 | Felix Laurus | Double top chord |
CA2412726A1 (en) * | 2000-06-27 | 2002-01-03 | Nci Building Systems, L.P. | Structural member for use in the construction of buildings |
WO2002001016A1 (en) | 2000-06-27 | 2002-01-03 | Nci Building Systems, L.P. | Structural member for use in the construction of buildings |
Non-Patent Citations (1)
Title |
---|
See also references of EP1687496A4 * |
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US8745959B2 (en) | 2006-05-18 | 2014-06-10 | Paradigm Focus Product Development Inc. | Light steel structural stud |
US8683774B2 (en) | 2006-05-18 | 2014-04-01 | Paradigm Focus Product Development Inc. | Light steel structural member and method of making same |
US8468774B2 (en) | 2008-04-11 | 2013-06-25 | QLD Steel Pty, Ptd. | Structural building components and method of constructing same |
WO2009124356A1 (en) * | 2008-04-11 | 2009-10-15 | Qld Steel Pty Ltd | Structural building components and method of constructing same |
AU2009235956B2 (en) * | 2008-04-11 | 2011-12-08 | Qld Steel Pty Ltd | Structural building components and method of constructing same |
US8950151B2 (en) | 2008-09-08 | 2015-02-10 | Ispan Systems Lp | Adjustable floor to wall connectors for use with bottom chord and web bearing joists |
US9975577B2 (en) | 2009-07-22 | 2018-05-22 | Ispan Systems Lp | Roll formed steel beam |
US8281540B2 (en) | 2009-11-09 | 2012-10-09 | Ispan Systems Lp | Unitary steel joist |
WO2011054094A1 (en) * | 2009-11-09 | 2011-05-12 | Best Joist Inc. | Unitary steel joist |
US8381469B2 (en) | 2010-04-08 | 2013-02-26 | Dizenio, Inc. | Cold formed joist |
WO2011123953A1 (en) * | 2010-04-08 | 2011-10-13 | Dizenio Inc. | Cold formed joist |
EP2556200B2 (en) † | 2011-06-03 | 2018-01-10 | Knauf International GmbH | Open web grid runner |
US8943776B2 (en) | 2012-09-28 | 2015-02-03 | Ispan Systems Lp | Composite steel joist |
US10280615B2 (en) | 2016-05-11 | 2019-05-07 | Ispan Systems Lp | Concrete formwork steel stud and system |
RU2675002C1 (en) * | 2018-02-21 | 2018-12-14 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Петербургский государственный университет путей сообщения Императора Александра I" | Preliminary stress-bearing reinforced beam |
US11459755B2 (en) | 2019-07-16 | 2022-10-04 | Invent To Build Inc. | Concrete fillable steel joist |
Also Published As
Publication number | Publication date |
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CA2667892A1 (en) | 2005-05-12 |
CA2667892C (en) | 2012-07-03 |
US20050108978A1 (en) | 2005-05-26 |
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