WO2006007658A1 - A structural member and a method for forming a structural member - Google Patents
A structural member and a method for forming a structural member Download PDFInfo
- Publication number
- WO2006007658A1 WO2006007658A1 PCT/AU2005/001076 AU2005001076W WO2006007658A1 WO 2006007658 A1 WO2006007658 A1 WO 2006007658A1 AU 2005001076 W AU2005001076 W AU 2005001076W WO 2006007658 A1 WO2006007658 A1 WO 2006007658A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hollow member
- inner hollow
- outer hollow
- brittle material
- bonding
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 40
- 239000000463 material Substances 0.000 claims abstract description 49
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000011440 grout Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 2
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 230000007246 mechanism Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
-
- 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
- E04C3/10—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal prestressed
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
- E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
Definitions
- the present invention relates to a structural member and a method for forming a structural member.
- the present invention provides a structural member including: an outer hollow member formed from a non-brittle material; a inner hollow member formed from a non-brittle material within, and bonded to, the outer hollow member, wherein the inner hollow member is bonded to the outer hollow member whilst in a tensioned or compressed state relative to the outer hollow member.
- the present invention provides a structural member including: an outer hollow member formed from a non-brittle material; a inner hollow member formed from a non-brittle material within, and bonded to, the outer hollow member, wherein the outer hollow member is bonded to the inner hollow member whilst in a compressed or tensioned state relative to the inner hollow member.
- the present invention provides a structural member adapted for use in a deflection sensitive application, the member including: an outer hollow member formed from a non-brittle material; a inner hollow member formed from a non-brittle material within, and bonded to, the outer hollow member, wherein the inner hollow member is bonded to the outer hollow member whilst in a tensioned or compressed state relative to the outer hollow member.
- the present invention provides a structural member adapted for use in a deflection sensitive application, the member including: an outer hollow member formed from a non-brittle material; a inner hollow member formed from a non-brittle material within, and bonded to, the outer hollow member, wherein the outer hollow member is bonded to the inner hollow member whilst in a compressed or tensioned state relative to the inner hollow member.
- the outer or inner non-brittle hollow members material includes any one of steel, aluminium, carbon fibre, plastics and/or other alloy or ferrous materials. Concrete is an example of a brittle material.
- the inner or outer hollow members preferably define a closed shape in cross-section and including, but are not limited to, hollow members having a circular, square or rectangular cross-sectional shape.
- the outer hollow member includes means to improve its bonding to the inner hollow member, for example, by providing a corrugated or ribbed internal surface
- the inner hollow member includes means for improving its bonding to the outer hollow member, for example by providing a corrugated or ribbed exterior surface
- both the interior of the outer hollow member and exterior of the inner hollow member can include such means for improving the bond therebetween.
- the present invention provides a method of forming a structural member, the method including bonding a inner hollow member formed from a non-brittle material within, and to, an outer hollow member formed from a non-brittle material, whilst the inner hollow member is in a tensioned or compressed state relative to the outer hollow member.
- the present invention provides a method of forming a structural member, the method including bonding at least one inner hollow member formed from a non-brittle material within, and to, an outer hollow member formed from a non-brittle material whilst the outer hollow member is in a compressed or tensioned state relative to the inner hollow member.
- the present invention provides a method of forming a structural member, the method including the steps of:
- the present invention provides a method of forming a structural member adapted for use in a deflection sensitive application, the method including bonding a inner hollow member within, and to, an outer hollow member formed from a non-brittle material, whilst the inner hollow member is in a tensioned state relative to the outer hollow member.
- the present invention provides a method of forming a structural member adapted for use in a deflection sensitive application, the method including bonding at least one inner hollow member within, and to, an outer hollow member formed from a non- brittle material whilst the hollow member is in a compressed state relative to the inner hollow member.
- the present invention provides a method of forming a structural member adapted for use in a deflection sensitive application, the method including the steps of:
- the tensile load applied to the inner hollow member is substantially equal in magnitude to the compressive load applied to the outer hollow member, hi another form, the tensile load applied to the inner hollow member differs in magnitude to the compressive load applied to the outer hollow member.
- the inner hollow member and outer hollow member are preferably bonded together by any one of the following: welding, gluing (including the use of grouts, particularly cementitous grouts) or by expanding the outer hollow member relative to the inner hollow member and/or shrinking the inner hollow member relative to the outer hollow member (for example by heating the outer hollow member and/or by cooling the inner hollow member prior to inserting the inner hollow member within the outer hollow member) prior to inserting the inner hollow member into the outer hollow member.
- Fig. 1 is a cross-sectional side view of a structural member according to a first embodiment of the invention
- Fig. 2 is a cross-sectional side view of a structural member according to a second embodiment of the invention.
- Fig. 3 is a cross-sectional side view of a structural member according to a third embodiment of the invention.
- Fig. 1 shows a structural member 10 having a steel outer hollow member or tube 12 and a steel inner hollow member or tube 14 therein.
- the structural member 10 is formed by bonding the inner hollow member exterior to the outer hollow member interior whilst the inner hollow member 14 is in a tensioned state relative to the outer hollow member 12 or, to put it another way, the outer hollow member 12 is in a compressive state relative to the inner hollow member 14.
- a first exemplary method for forming the structural member 10 involves inserting the inner hollow member 14 within the interior of the outer hollow member 12, and applying a tensile load to the inner hollow member 14, as indicated by arrows 'T', for example by securing one end of the inner hollow member to a relatively fixed structure and applying a tensile load to the other end of the inner hollow member 14.
- the remaining interior of the outer hollow member 12 is then filled with cementitous grout 18 and the grout 18 is allowed to set before removing the load from the inner hollow member 14. Any exposed inner hollow member ends can also then be trimmed.
- the inner hollow member 14 can be left unrestrained and a compressive load can be applied to the outer hollow member 12, for example by restraining one end of the hollow member 12 to a relatively fixed structure and applying a compressive load to the other end, as indicated by arrows C.
- the inner hollow member 14 is then bonded to the outer hollow member 12 in the manner described above before releasing the compressive load on the hollow member 12.
- both a tensile load can be applied to the inner hollow member 14 and a simultaneously compressive load can be applied to the outer hollow member 12, during the bonding process described above.
- One approach to this method is to restrain, for example by clamping, one end of the inner hollow member 14 to the corresponding end of the outer hollow member 12 and applying a tensile load to the other end of the inner hollow member 14, with that tensile load being resisted by the other end of the outer hollow member 12. This results in equal and opposite tensile T and compressive forces C being applied to the inner hollow member 14 and outer hollow member 12 respectively.
- a compressive load C is applied to the inner hollow member 14 and/or a tensile load T is applied to the outer hollow member 12, prior to the bonding process described above.
- the bond between the inner hollow member 14 and the outer hollow member 12 is improved by adding corrugations or ribs 22 to the interior surface of the outer hollow member 12 and/or by adding corrugations or ribs 24 to the exterior surface of the inner hollow member 14.
- the structural members described above store strain energy therein. Accordingly, as forces are applied to the structural member in use, the counter strain stored in the member, and thereby the structure it is associated with, resists the application of that load. This results in a structural member, and an associated structure, which (within certain boundaries) can accept load with reduced strain and thus increased strength. This leads to significant improvements in the ability to resist deflection and also significant improvements in load carrying capacity. For example, in naval applications ships can be made lighter and hence faster, hi aviation applications aeroplanes can be made lighter and thus faster. In civil applications, bridges can span further using the same amount of materials as an existing bridge or span the same amount as an existing bridge using less materials.
- the structural members can be produced using the methods described above and later assembled into a structure mechanism or device. Alternatively, the method can be applied to hollow members within an existing structure mechanism or device in order to improve their ability to withstand deflection.
- the structural members described above allow larger stronger structures to be constructed at reduced expense. It is estimated that the use of the structural members will allow production costs to be as much as halved, particularly in deflection sensitive applications.
- the inner and outer hollow members can be of any shape.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2004904035 | 2004-07-21 | ||
AU2004904035A AU2004904035A0 (en) | 2004-07-21 | Strain Storage Mechanism |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006007658A1 true WO2006007658A1 (en) | 2006-01-26 |
Family
ID=35784809
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2005/001076 WO2006007658A1 (en) | 2004-07-21 | 2005-07-21 | A structural member and a method for forming a structural member |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2006007658A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0722015B1 (en) * | 1995-01-13 | 1998-07-29 | The D. S. Brown Company, Inc. | Suspension bridge cable wrap and application method |
US20020083659A1 (en) * | 2000-12-29 | 2002-07-04 | Sorkin Felix L. | Method and apparatus for sealing an intermediate anchorage of a post-tension system |
-
2005
- 2005-07-21 WO PCT/AU2005/001076 patent/WO2006007658A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0722015B1 (en) * | 1995-01-13 | 1998-07-29 | The D. S. Brown Company, Inc. | Suspension bridge cable wrap and application method |
US20020083659A1 (en) * | 2000-12-29 | 2002-07-04 | Sorkin Felix L. | Method and apparatus for sealing an intermediate anchorage of a post-tension system |
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