EP0683284A1 - Noyau d'une pièce, intégré et à haute résistance - Google Patents

Noyau d'une pièce, intégré et à haute résistance Download PDF

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Publication number
EP0683284A1
EP0683284A1 EP94303525A EP94303525A EP0683284A1 EP 0683284 A1 EP0683284 A1 EP 0683284A1 EP 94303525 A EP94303525 A EP 94303525A EP 94303525 A EP94303525 A EP 94303525A EP 0683284 A1 EP0683284 A1 EP 0683284A1
Authority
EP
European Patent Office
Prior art keywords
core
housing
core member
high strength
load
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.)
Withdrawn
Application number
EP94303525A
Other languages
German (de)
English (en)
Inventor
Benne Narasimhamurthy Sridhara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tube Investments of India Ltd
Original Assignee
Tube Investments of India Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tube Investments of India Ltd filed Critical Tube Investments of India Ltd
Priority to EP94303525A priority Critical patent/EP0683284A1/fr
Publication of EP0683284A1 publication Critical patent/EP0683284A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/30—Columns; Pillars; Struts
    • E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
    • 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

Definitions

  • This invention relates to a housed high strength core member having improved resistance to buckling on application of axial compression loads at the two ends.
  • Compression members are adapted to take compression loads and are used in a variety of civil and mechanical structures.
  • housed cores can be used in building columns, transmission towers, offshore platform legs, bridges, geodesic domes, scaffolding props, hydraulic jacks and many other applications that have a load applied on both ends.
  • yield strength is a mechanical property of the material
  • buckling strength of the compression member is a geometric property and depends on the least moment of inertia of the cross section and the unsupported length of the compression member.
  • the Euler's equation establishes the critical load for pin ended compression member as follows : in which Pcr is the critical load at which the compression member buckles, E is the modulus of elasticity of the material of the compression member, l is the length of the compression member and I is the least moment of inertia of the cross-section.
  • the load at which buckling occurs depends on the stiffness of the member.
  • both the required flexural stiffness and required cross-sectional area are provided by the cross section of the member resisting the applied axial load.
  • High strength materials have a high strength to cost ratio and hence their use as compression member would result in economy if the material property can be fully utilised.
  • Core is a high strength member and can be made of materials such as steel, carbon fibres, kevlar etc.
  • Housing is a hollow section and can be made of high stiffness materials such as steel, aluminium, FRP etc.
  • Infills can be (a) grout and (b) spacers.
  • Grout can be cement slurry, cement mortar, cement concrete, cellular concrete, plaster of paris, epoxy, fly-ash and a variety of similar materials.
  • Spacers can be of steel or any material and should be closely spaced.
  • the flexural stiffness is provided by a housing within which at least one core is placed and the core provides the cross sectional area.
  • the gap between the core and the housing is filled with infils.
  • the invention also provides a method of making the high strength core member shorter than the housing and the core member will bear the axial load with the housing providing the flexural stiffness as described above.
  • the housed high strength core member according to the invention may be used effectively and economically in structures like off-shore drilling platforms, transmission towers, crane booms, hydraulic cylinders/jacks, pistons, compression members in mechanical equipments, bicycles, railway coaches, railway freight cars, automobiles, TV towers, building structures, geodesic domes, towers, bridges, scaffolding props, aerospace structures etc. to name a few.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Rod-Shaped Construction Members (AREA)
EP94303525A 1994-05-18 1994-05-18 Noyau d'une pièce, intégré et à haute résistance Withdrawn EP0683284A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94303525A EP0683284A1 (fr) 1994-05-18 1994-05-18 Noyau d'une pièce, intégré et à haute résistance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94303525A EP0683284A1 (fr) 1994-05-18 1994-05-18 Noyau d'une pièce, intégré et à haute résistance

Publications (1)

Publication Number Publication Date
EP0683284A1 true EP0683284A1 (fr) 1995-11-22

Family

ID=8217710

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94303525A Withdrawn EP0683284A1 (fr) 1994-05-18 1994-05-18 Noyau d'une pièce, intégré et à haute résistance

Country Status (1)

Country Link
EP (1) EP0683284A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2312434C1 (ru) * 2006-05-10 2007-12-10 Государственное образовательное учреждение высшего профессионального образования Марийский государственный технический университет Способ изготовления предварительно напряженного стержневого элемента
DE102019003013A1 (de) * 2018-11-14 2020-06-04 Christian Markmann Ein stabförmiger Formkörper bestehend aus mehreren Materialien zur Verwendung für lastabtragende Konstruktionselemente im Bauwesen

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191217206A (en) * 1912-07-24 1913-06-12 Henry James-Carrington Improvements in Columns Formed of Reinforced Concrete, or Reinforced Blockwork.
FR1537471A (fr) * 1967-09-21 1968-08-23 Acier Beton S A Poteau en plusieurs éléments pour constructions immobilières et industrielles
DE2546893A1 (de) * 1975-10-20 1977-04-28 Geb Rexin Elisabeth Jochum Fuellbetonpfeiler fuer brueckentragwerke und foerdergerueste
DE2719487A1 (de) * 1977-05-02 1978-11-23 Heinz Dipl Ing Borsdorf Eintragung von eigenspannungszustaenden in biegetraeger und normalkraftbeanspruchte staebe
DE2723534A1 (de) * 1977-05-25 1978-12-14 Heinz Dipl Ing Borsdorf Knickstabilisierte druck- und biegedruckelemente
DE2727698A1 (de) * 1977-06-15 1979-02-01 Heinz Dipl Ing Borsdorf Knickstabilisierte stabdruckfedern im verfahren der ein- und zweiachsig vorgespannten betonfahrbahnen mit stabilisiertem untergrund
EP0518771A1 (fr) * 1991-06-13 1992-12-16 FREYSSINET INTERNATIONAL et COMPAGNIE Perfectionnements aux procédés et dispositifs pour renforcer le béton à la compression et aux ouvrages en béton ainsi renforcés
US5175972A (en) * 1984-07-02 1993-01-05 Hasnain Investments (P) Limited Sleeved compression member

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191217206A (en) * 1912-07-24 1913-06-12 Henry James-Carrington Improvements in Columns Formed of Reinforced Concrete, or Reinforced Blockwork.
FR1537471A (fr) * 1967-09-21 1968-08-23 Acier Beton S A Poteau en plusieurs éléments pour constructions immobilières et industrielles
DE2546893A1 (de) * 1975-10-20 1977-04-28 Geb Rexin Elisabeth Jochum Fuellbetonpfeiler fuer brueckentragwerke und foerdergerueste
DE2719487A1 (de) * 1977-05-02 1978-11-23 Heinz Dipl Ing Borsdorf Eintragung von eigenspannungszustaenden in biegetraeger und normalkraftbeanspruchte staebe
DE2723534A1 (de) * 1977-05-25 1978-12-14 Heinz Dipl Ing Borsdorf Knickstabilisierte druck- und biegedruckelemente
DE2727698A1 (de) * 1977-06-15 1979-02-01 Heinz Dipl Ing Borsdorf Knickstabilisierte stabdruckfedern im verfahren der ein- und zweiachsig vorgespannten betonfahrbahnen mit stabilisiertem untergrund
US5175972A (en) * 1984-07-02 1993-01-05 Hasnain Investments (P) Limited Sleeved compression member
EP0518771A1 (fr) * 1991-06-13 1992-12-16 FREYSSINET INTERNATIONAL et COMPAGNIE Perfectionnements aux procédés et dispositifs pour renforcer le béton à la compression et aux ouvrages en béton ainsi renforcés

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2312434C1 (ru) * 2006-05-10 2007-12-10 Государственное образовательное учреждение высшего профессионального образования Марийский государственный технический университет Способ изготовления предварительно напряженного стержневого элемента
DE102019003013A1 (de) * 2018-11-14 2020-06-04 Christian Markmann Ein stabförmiger Formkörper bestehend aus mehreren Materialien zur Verwendung für lastabtragende Konstruktionselemente im Bauwesen

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