EP0150545A1 - Zusammengesetztes Stahlfachwerk und Beton-Deckenkonstruktion - Google Patents

Zusammengesetztes Stahlfachwerk und Beton-Deckenkonstruktion Download PDF

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Publication number
EP0150545A1
EP0150545A1 EP84300495A EP84300495A EP0150545A1 EP 0150545 A1 EP0150545 A1 EP 0150545A1 EP 84300495 A EP84300495 A EP 84300495A EP 84300495 A EP84300495 A EP 84300495A EP 0150545 A1 EP0150545 A1 EP 0150545A1
Authority
EP
European Patent Office
Prior art keywords
truss
concrete
members
top chord
floor construction
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Withdrawn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
EP84300495A
Other languages
English (en)
French (fr)
Inventor
Buckie A. Taft
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.)
Steel Research Inc
Original Assignee
Steel Research Inc
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 Steel Research Inc filed Critical Steel Research Inc
Priority to DE1984300495 priority Critical patent/DE150545T1/de
Priority to EP84300495A priority patent/EP0150545A1/de
Publication of EP0150545A1 publication Critical patent/EP0150545A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the invention relates generally to the area of open web steel framing and concrete floor buildings and more particularly to a primary steel framing member, in the form of a truss, in which the top chord acts as the shear connector in a composite system.
  • Composite design has been used in the construction industry for many years. The development and sophistication of economic structural systems gradually extended to steel buildings and concrete floor construction, the result of which was to significantly reduce cost of steel framing in the industry. However, composite construction was confined to primary wide flange or solid section members which stud-type shear connectors welded onto the top flanges in the field, and secondary framing members .such as joists or beams, but not to primary trusses.
  • conventional composite design consists essentially of three elements; that is, concrete, a steel beam or joist and a shear transfer mechanism.
  • the shear transfer mechanism has usually been a stud shear-connector welded to the top flange of the beam and then the stud was encased in the concrete.
  • the shear-connecting device or stud properly welded to the top flange of the beam, must be capable of developing the necessary shear force between the stud on the beam and the concrete to produce the desired composite action.
  • the invention comprises intrinsically the use of the top chord of a primary framing member or truss as a continuous or substantially continuous shear connector in composite construction.
  • the concrete may be thickened at the truss line in order to increase the load-carrying capacity of the embedded top chord.
  • the concrete may then gradually be reduced in thickness either close to or at a predetermined distance from the chord to a thickness dictated by the design requirements, as for example 3 inches.
  • the top chord supports joists in conventional fashion.
  • the top chord of the truss in a multi-purpose function.
  • the truss depth can be considerably less than it would be in the non-composite stage and thus decreases the weight of primary framing members. Because floor stiffness is increased by composite action, vibration and deflection are reduced substantially since there is a higher moment of inertia in the composite stage.
  • the framing structure is comprised or primary framing members or trusses 12 and secondary framing members or joists 14 which are supported at each end by the trusses 12.
  • the trusses have a bottom chord comprised of two abutting or separated angle members 16 and 18 and a top chord comprised of two channel members 20 and 22 which are spaced apart at the vertical leg with the horizontal legs thereof facing away from each other.
  • a continuous gusset connection plate 24 is secured to channels 20 and 22 between their webs and extends below the lower flanges of the channels as shown in Figure 2.
  • the perforated top chord web may be of welded straight channel members as shown in Figures 1, 2 and 6 or the top chord may be a sine-wave type bar, supported by a hat section as shown in Figures 4 and 5 or in any other member.
  • the continuous gusset connection plate 24 supports the angle members 26 and 28 which are secured as by welding to the connection plate 24 and to the abutting legs of the bottom chord angle pieces 16 and 18.
  • a series of angle members 26 and 28 are secured as by welding to the connection plate 24 of the upper chord and to the abutting legs of the angle members 16 and 18 which comprise the bottom chord.
  • angle members 30 and 32 extend generally vertically on each side of the gusset plate 24 and the legs of bottom chord 16 and 18 at locations at which joists 14 will be supported as is shown particularly in Figure 6.
  • the joist secondary framing member 14 has an upper chord 40 and a lower chord 42 with an open web bar 44 extending between the show 46 where it is solidly connected and the bottom chord 42. Note that the end shoe 46 is supported on the lower flange of channel members 22 and 20.
  • the joists made according to the invention described in prior art patents above, have roll bars 48 with handles 50 for supporting plywood forms 52 for the concrete floor which is to be poured when the framing members and the forms are in place at the construction site.
  • the plywood form member 52 extends to the lower flange of the truss top chord, and the plywood form as at 53 extends outwardly at an angle until the distance between the top surface of the form 52 and the poured concrete 54 surface is as designed by the structural engineer.
  • the form section 53 is shown to be a slight angle extending from the lower flange of the top chord of the truss to the top of the roll bar 48. The distance over which the angle portion 53 extends may vary according to design specifications.
  • Utilizing the top chord of the truss in a multi-function role that is, as a support for secondary framing members, as a conventional to chord to support construction loads, and as a continuous or substantially continuous shear connector in the composite stage, represents a new concept in steel framing and composite concrete floor construction.
  • the concept of using the top chord of the primary framing member in this multi-purpose way is totally new and novel in the construction industry.
  • FIGS 3 and 4 show an alternative composite system design utilzing trusses 60 with conventional Hambro (registered trademark) joists as described above.
  • truss member 60 has lower angle members 62 and 64 in which the vertical legs are spaced apart to accommodate the serpentine or sine-wye web member 66.
  • U-shaped channel member 68 acting as the top chord having horizontal web 70, vertical sides 72 and horizontal flanges 74.
  • the channel faces upwardly as shown in Figure 4 so that a sine-wave or serpentine type shear connector 76 is welded to the inside surface of the web 70. It extends for the full length of the top chord 68 to define a substantially continuous shear connector.
  • the concrete when poured embeds the shear connector and may be thickest at the truss line.
  • Figure 7 shows a relatively deeper to chord 80 with channel members 82 and 84 and gusset plate 86 where the truss is used with a long span deck 88 on the top of which is poured concrete to the level 89.
  • this embodiment shows use of the top chord of the truss in its multi-function role including that of a continuous shear connector.
  • a deeper truss top chord 90 has channel members 92 and 94 and web extension 96.
  • a ribbed deck 98 is supported by a conventional joist structure 100 in which truss top chord 92 and 94 again becomes a continuous shear connector in addition to its other functions.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)
  • Rod-Shaped Construction Members (AREA)
EP84300495A 1984-01-26 1984-01-26 Zusammengesetztes Stahlfachwerk und Beton-Deckenkonstruktion Withdrawn EP0150545A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1984300495 DE150545T1 (de) 1984-01-26 1984-01-26 Zusammengesetztes stahlfachwerk und beton-deckenkonstruktion.
EP84300495A EP0150545A1 (de) 1984-01-26 1984-01-26 Zusammengesetztes Stahlfachwerk und Beton-Deckenkonstruktion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84300495A EP0150545A1 (de) 1984-01-26 1984-01-26 Zusammengesetztes Stahlfachwerk und Beton-Deckenkonstruktion

Publications (1)

Publication Number Publication Date
EP0150545A1 true EP0150545A1 (de) 1985-08-07

Family

ID=8192544

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84300495A Withdrawn EP0150545A1 (de) 1984-01-26 1984-01-26 Zusammengesetztes Stahlfachwerk und Beton-Deckenkonstruktion

Country Status (2)

Country Link
EP (1) EP0150545A1 (de)
DE (1) DE150545T1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110939201A (zh) * 2019-12-10 2020-03-31 集束智能装配科技有限公司 一种钢建筑结构用主、次梁及其连接结构
CN112343230A (zh) * 2019-08-08 2021-02-09 湖南建工集团有限公司 一种装配式模板桁架支撑装置
CN115012578A (zh) * 2022-05-30 2022-09-06 中国十七冶集团有限公司 一种钢结构空腹桁架网格单元化结构及施工方法
CN117231040A (zh) * 2023-10-18 2023-12-15 上海建工四建集团有限公司 用于支撑钢结构楼承板的桁架支撑装备及其应用方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624980A (en) * 1970-02-11 1971-12-07 Ira J Mcmanus Composite end connection for steel joists

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624980A (en) * 1970-02-11 1971-12-07 Ira J Mcmanus Composite end connection for steel joists

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112343230A (zh) * 2019-08-08 2021-02-09 湖南建工集团有限公司 一种装配式模板桁架支撑装置
CN110939201A (zh) * 2019-12-10 2020-03-31 集束智能装配科技有限公司 一种钢建筑结构用主、次梁及其连接结构
CN115012578A (zh) * 2022-05-30 2022-09-06 中国十七冶集团有限公司 一种钢结构空腹桁架网格单元化结构及施工方法
CN118110272A (zh) * 2022-05-30 2024-05-31 中国十七冶集团有限公司 空腹桁架网格单元与钢制楼承板的连接结构及施工方法
CN115012578B (zh) * 2022-05-30 2024-05-31 中国十七冶集团有限公司 一种钢结构空腹桁架网格单元化结构及施工方法
CN117231040A (zh) * 2023-10-18 2023-12-15 上海建工四建集团有限公司 用于支撑钢结构楼承板的桁架支撑装备及其应用方法

Also Published As

Publication number Publication date
DE150545T1 (de) 1985-12-05

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

ITCL It: translation for ep claims filed

Representative=s name: JACOBACCI CASETTA & PERANI S.P.A.

EL Fr: translation of claims filed
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Effective date: 19860124

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Effective date: 19870317

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18D Application deemed to be withdrawn

Effective date: 19870804

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TAFT, BUCKIE A.