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Space frame

January 01, 1970

In architecture and structural engineering, a space frame or space structure (3D truss) is a rigid, lightweight, truss-like structure constructed from interlocking struts in a geometric pattern. Space frames can be used to span large areas with few interior supports. Like the truss, a space frame is strong because of the inherent rigidity of the triangle; flexing loads (bending moments) are transmitted as tension and compression loads along the length of each strut.

The roof of this industrial building is supported by a space frame structure.
If a force is applied to the blue node and the red bar were not present, the resultant effect on the structure would depend entirely on the blue node's bending rigidity, i.e. to its resistance (or lack thereof) to bending; however, with the red bar in place, then assuming negligible bending rigidity of the blue node as compared with the red bar's contributing rigidity, this 3-dimensional load bearing truss structure could be solved using a rigidity matrix (neglecting angular factors).

Chief applications include buildings and vehicles.

History edit

Alexander Graham Bell from 1898 to 1908 developed space frames based on tetrahedral geometry.[1][2] Bell's interest was primarily in using them to make rigid frames for nautical and aeronautical engineering, with the tetrahedral truss being one of his inventions.

Max Mengeringhausen developed the space grid system called MERO (acronym of MEngeringhausen ROhrbauweise) in 1943 in Germany, thus initiating the use of space trusses in architecture.[3] The commonly used method, still in use has individual tubular members connected at node joints (ball shaped) and variations such as the space deck system, octet truss system and cubic system.

Stéphane de Chateau in France invented the Tridirectional SDC system (1957), Unibat system (1959), Pyramitec (1960).[4][5] A method of tree supports was developed to replace the individual columns.[6]

Buckminster Fuller patented the octet truss (U.S. patent 2,986,241) in 1961[7] while focusing on architectural structures.

Gilman's Tetrahedral Truss of 1980 was developed by John J. Gilman; a material scientist known for his work on the molecular matrices of crystaline solids. Gilman was an admirer of Buckminster Fuller's architectural trusses, and developed a stronger matrix, in part by rotating an alignment of tetrahedral nodes in relation to each other.

Design methods edit

Space frames are typically designed using a rigidity matrix. The special characteristic of the stiffness matrix in an architectural space frame is the independence of the angular factors. If the joints are sufficiently rigid, the angular deflections can be neglected, simplifying the calculations.

Overview edit

 
Simplified space frame roof with the half-octahedron highlighted in blue

The simplest form of space frame is a horizontal slab of interlocking square pyramids and tetrahedra built from Aluminium or tubular steel struts. In many ways this looks like the horizontal jib of a tower crane repeated many times to make it wider. A stronger form is composed of interlocking tetrahedra in which all the struts have unit length. More technically this is referred to as an isotropic vector matrix or in a single unit width an octet truss. More complex variations change the lengths of the struts to curve the overall structure or may incorporate other geometrical shapes.

Types edit

Within the meaning of space frame, we can find three systems clearly different between them:[8]

Curvature classification

  • Space plane covers: These spatial structures are composed of planar substructures. Their behavior is similar to that of a plate in which the deflections in the plane are channeled through the horizontal bars and the shear forces are supported by the diagonals.[9]
 
This train station in India is supported by a barrel vault structure
  • Barrel vaults: This type of vault has a cross section of a simple arch. Usually this type of space frame does not need to use tetrahedral modules or pyramids as a part of its backing. The section type barrel vault is organized according to IS: 800-2007, and the evaluation is carried out mostly using STAAD. This work elicit evaluations of models for range, extreme redirection, self-weight, and cost.[10]
  • Spherical domes and other compound curves usually require the use of tetrahedral modules or pyramids and additional support from a skin.

Classification by the arrangement of its elements

  • Single layer grid: All elements are located on the surface to be approximated.
  • Double layer grid: Elements are organized in two layers parallel to each other at a certain distance apart. Each of the layers form a lattice of triangles, squares or hexagons in which the projection of the nodes in a layer may overlap or be displaced relative to each other. Diagonal bars connect the nodes of both layers in different directions in space. In this type of meshes, the elements are associated into three groups: upper cordon, cordon and cordon lower diagonal.
  • Triple layer grid: Elements are placed in three parallel layers, linked by the diagonals. They are almost always flat.

Other examples classifiable as space frames are these:

  • Pleated metallic structures: Emerged to try to solve the problems that formwork and pouring concrete had their counterparts. Typically run with welded joint, but may raise prefabricated joints, a fact which makes them space meshes.
  • Hanging covers: Designs on the cable taut, spine, and the catenary arch (inverted funicular show their ability to channel forces theoretically better than any other alternative, have an infinite range of possibilities for composition and adaptability to any type of plant cover or ensure vain. However, imprecisions in shape having the loaded strand (ideally adapts dynamically to the state of charge) and the risk of bending the arc to unexpected stresses are problems that require pre-compression and pre-stressing elements. Although in most cases tend to be the cheapest and the technical solution that best fits the acoustics and ventilation of the covered enclosure, are vulnerable to vibration.
  • Pneumatic structures: Closure membranes subjected to a pressurized state may be considered within this group.

Applications edit

Chief space frame applications include:

Buildings

Vehicles:

    • Aircraft
    • Automobiles
    • Motorcycles
    • Bicycles
    • Spacecraft

Architectural design elements

Construction edit

Space frames are a common feature in modern building construction; they are often found in large roof spans in modernist commercial and industrial buildings.

Examples of buildings based on space frames include:

Large portable stages and lighting gantries are also frequently built from space frames and octet trusses.

Vehicles edit

 
Yeoman YA-1 vs CA-6 Wackett frames.

Aircraft edit

The CAC CA-6 Wackett and Yeoman YA-1 Cropmaster 250R aircraft were built using roughly the same welded steel tube fuselage frame.

Many early “whirlybird”-style exposed-boom helicopters had tubular space frame booms, such as the Bell 47 series.

Cars edit

Space frames are sometimes used in the chassis designs of automobiles and motorcycles. In both a space frame and a tube-frame chassis, the suspension, engine, and body panels are attached to a skeletal frame of tubes, and the body panels have little or no structural function. By contrast, in a unibody or monocoque design, the body serves as part of the structure.

Tube-frame chassis pre-date space frame chassis and are a development of the earlier ladder chassis. The advantage of using tubes rather than the previous open channel sections is that they resist torsional forces better. Some tube chassis were little more than a ladder chassis made with two large diameter tubes, or even a single tube as a backbone chassis. Although many tubular chassis developed additional tubes and were even described as "space frames", their design was rarely correctly stressed as a space frame and they behaved mechanically as a tube ladder chassis, with additional brackets to support the attached components, suspension, engine etc. The distinction of the true space frame is that all the forces in each strut are either tensile or compression, never bending.[11] Although these additional tubes did carry some extra load, they were rarely diagonalised into a rigid space frame.[11]

An earlier contender for the first true space frame chassis is the one off Chamberlain 8 race "special" built by brothers Bob and Bill Chamberlain in Melbourne, Australia in 1929.[12] Others attribute vehicles produced in the 1930s by designers such as Buckminster Fuller and William Bushnell Stout (the Dymaxion and the Stout Scarab) who understood the theory of the true space frame from either architecture or aircraft design.[13]

A post WW2 attempt to build a racing car space frame was the Cisitalia D46 of 1946.[13] This used two small diameter tubes along each side, but they were spaced apart by vertical smaller tubes, and so were not diagonalised in any plane. A year later, Porsche designed their Type 360 for Cisitalia. As this included diagonal tubes, it can be considered a true space frame and arguable the first mid-rear engined design.[13]

 
Jaguar C-Type frame

The Maserati Tipo 61 of 1959 (Birdcage) is often thought of as the first but in 1949 Robert Eberan von Eberhorst designed the Jowett Jupiter exhibited at that year's London Motor Show; the Jowett went on to take a class win at the 1950 Le Mans 24hr. Later, TVR, the small British car manufacturers developed the concept and produced an alloy-bodied two seater on a multi tubular chassis, which appeared in 1949.

Colin Chapman of Lotus introduced his first 'production' car, the Mark VI, in 1952. This was influenced by the Jaguar C-Type chassis, another with four tubes of two different diameters, separated by narrower tubes. Chapman reduced the main tube diameter for the lighter Lotus, but did not reduce the minor tubes any further, possibly because he considered that this would appear flimsy to buyers.[11] Although widely described as a space frame, Lotus did not build a true space frame chassis until the Mark VIII, with the influence of other designers, with experience from the aircraft industry.[11]

 
Chilean kitcar showing off its space frame structure (2013).

A large number of kit cars use space frame construction, because manufacture in small quantity requires only simple and inexpensive jigs, and it is relatively easy for an amateur designer to achieve good stiffness with a space frame.

A drawback of the space frame chassis is that it encloses much of the working volume of the car and can make access for both the driver and to the engine difficult. The Mercedes-Benz 300 SL “Gullwing” received its iconic upward-opening doors when its tubular space frame made using regular doors impossible.

Some space frames have been designed with removable sections, joined by bolted pin joints. Such a structure had already been used around the engine of the Lotus Mark III.[14] Although somewhat inconvenient, an advantage of the space frame is that the same lack of bending forces in the tubes that allow it to be modelled as a pin-jointed structure also means that creating such a removable section need not reduce the strength of the assembled frame.

 
Moulton Bicycle at the Museum of Modern Art
 
2006 Ducati Monster S2R 1000

Motorcycles and bicycles edit

Italian motorbike manufacturer Ducati extensively uses tube frame chassis on its models.

Space frames have also been used in bicycles, which readily favor stressed triangular sectioning.

See also edit

References edit

  1. ^ . Archived from the original on 2003-03-26.
  2. ^ Alexander Graham Bell (June 1903). "Tetrahedral Principle In Kite Structure". National Geographic Magazine. XIV (6).
  3. ^ . Archived from the original on 2016-09-15.
  4. ^ "Unibat system".
  5. ^ Porto, Cláudia Estrela (2014). (PDF). Architectus. 4 (40). Poland: 51–64. Archived from the original (PDF) on September 16, 2016.
  6. ^ Evolution of Space Frames November 19, 2015, at the Wayback Machine Cities Now
  7. ^ Dorothy Harley Eber, via telephone (June 29, 1978). "Fuller on Bell".
  8. ^ Otero C. (1990). "Diseño geométrico de cúpulas no esféricas aproximadas por mallas triangulares, con un número mínimo de longitudes de barra". Tesis Doctoral. Universidad de Cantabria.
  9. ^ Cavia Sorret (1993).
  10. ^ "Design and Analysis of Barrel Vault Space Frame Structure". www.ijraset.com. Retrieved 2022-11-08.
  11. ^ a b c d Ludvigsen & Colin Chapman, p. 153–154
  12. ^ https://primotipo.com/2015/07/24/chamberlain-8-by-john-medley-and-mark-bisset/. ‘The Chamberlain An Australian Story’ John Hazelden
  13. ^ a b c Ludvigsen, Karl (2010). Colin Chapman: Inside the Innovator. Haynes Publishing. pp. 150–164. ISBN 1-84425-413-5.
  14. ^ Ludvigsen & Colin Chapman, p. 151
 
Wikimedia Commons has media related to Space frames.

January 01, 1970
space, frame, architecture, structural, engineering, space, frame, space, structure, truss, rigid, lightweight, truss, like, structure, constructed, from, interlocking, struts, geometric, pattern, used, span, large, areas, with, interior, supports, like, truss. In architecture and structural engineering a space frame or space structure 3D truss is a rigid lightweight truss like structure constructed from interlocking struts in a geometric pattern Space frames can be used to span large areas with few interior supports Like the truss a space frame is strong because of the inherent rigidity of the triangle flexing loads bending moments are transmitted as tension and compression loads along the length of each strut The roof of this industrial building is supported by a space frame structure If a force is applied to the blue node and the red bar were not present the resultant effect on the structure would depend entirely on the blue node s bending rigidity i e to its resistance or lack thereof to bending however with the red bar in place then assuming negligible bending rigidity of the blue node as compared with the red bar s contributing rigidity this 3 dimensional load bearing truss structure could be solved using a rigidity matrix neglecting angular factors Chief applications include buildings and vehicles Contents 1 History 2 Design methods 3 Overview 4 Types 5 Applications 5 1 Construction 5 2 Vehicles 5 2 1 Aircraft 5 2 2 Cars 5 2 3 Motorcycles and bicycles 6 See also 7 ReferencesHistory editAlexander Graham Bell from 1898 to 1908 developed space frames based on tetrahedral geometry 1 2 Bell s interest was primarily in using them to make rigid frames for nautical and aeronautical engineering with the tetrahedral truss being one of his inventions Max Mengeringhausen developed the space grid system called MERO acronym of MEngeringhausen ROhrbauweise in 1943 in Germany thus initiating the use of space trusses in architecture 3 The commonly used method still in use has individual tubular members connected at node joints ball shaped and variations such as the space deck system octet truss system and cubic system Stephane de Chateau in France invented the Tridirectional SDC system 1957 Unibat system 1959 Pyramitec 1960 4 5 A method of tree supports was developed to replace the individual columns 6 Buckminster Fuller patented the octet truss U S patent 2 986 241 in 1961 7 while focusing on architectural structures Gilman s Tetrahedral Truss of 1980 was developed by John J Gilman a material scientist known for his work on the molecular matrices of crystaline solids Gilman was an admirer of Buckminster Fuller s architectural trusses and developed a stronger matrix in part by rotating an alignment of tetrahedral nodes in relation to each other Design methods editSpace frames are typically designed using a rigidity matrix The special characteristic of the stiffness matrix in an architectural space frame is the independence of the angular factors If the joints are sufficiently rigid the angular deflections can be neglected simplifying the calculations Overview edit nbsp Simplified space frame roof with the half octahedron highlighted in blue The simplest form of space frame is a horizontal slab of interlocking square pyramids and tetrahedra built from Aluminium or tubular steel struts In many ways this looks like the horizontal jib of a tower crane repeated many times to make it wider A stronger form is composed of interlocking tetrahedra in which all the struts have unit length More technically this is referred to as an isotropic vector matrix or in a single unit width an octet truss More complex variations change the lengths of the struts to curve the overall structure or may incorporate other geometrical shapes Types editWithin the meaning of space frame we can find three systems clearly different between them 8 Curvature classification Space plane covers These spatial structures are composed of planar substructures Their behavior is similar to that of a plate in which the deflections in the plane are channeled through the horizontal bars and the shear forces are supported by the diagonals 9 nbsp This train station in India is supported by a barrel vault structure Barrel vaults This type of vault has a cross section of a simple arch Usually this type of space frame does not need to use tetrahedral modules or pyramids as a part of its backing The section type barrel vault is organized according to IS 800 2007 and the evaluation is carried out mostly using STAAD This work elicit evaluations of models for range extreme redirection self weight and cost 10 Spherical domes and other compound curves usually require the use of tetrahedral modules or pyramids and additional support from a skin Classification by the arrangement of its elements Single layer grid All elements are located on the surface to be approximated Double layer grid Elements are organized in two layers parallel to each other at a certain distance apart Each of the layers form a lattice of triangles squares or hexagons in which the projection of the nodes in a layer may overlap or be displaced relative to each other Diagonal bars connect the nodes of both layers in different directions in space In this type of meshes the elements are associated into three groups upper cordon cordon and cordon lower diagonal Triple layer grid Elements are placed in three parallel layers linked by the diagonals They are almost always flat Other examples classifiable as space frames are these Pleated metallic structures Emerged to try to solve the problems that formwork and pouring concrete had their counterparts Typically run with welded joint but may raise prefabricated joints a fact which makes them space meshes Hanging covers Designs on the cable taut spine and the catenary arch inverted funicular show their ability to channel forces theoretically better than any other alternative have an infinite range of possibilities for composition and adaptability to any type of plant cover or ensure vain However imprecisions in shape having the loaded strand ideally adapts dynamically to the state of charge and the risk of bending the arc to unexpected stresses are problems that require pre compression and pre stressing elements Although in most cases tend to be the cheapest and the technical solution that best fits the acoustics and ventilation of the covered enclosure are vulnerable to vibration Pneumatic structures Closure membranes subjected to a pressurized state may be considered within this group Applications editChief space frame applications include Buildings Industrial structures Factories Warehouses Commercial entertainment and service facilities Sports halls Conference halls pavilions and exhibition centers Stadiums Museums and fair houses Shopping malls Airports Vehicles Aircraft Automobiles Motorcycles Bicycles Spacecraft Architectural design elements Atriums Geodesics Construction edit Space frames are a common feature in modern building construction they are often found in large roof spans in modernist commercial and industrial buildings Examples of buildings based on space frames include Stansted Airport by Foster Partners Bank of China Tower and the Louvre Pyramid by I M Pei Rogers Centre by Rod Robbie and Michael Allan McCormick Place East in Chicago Arena das Dunas in Natal Brazil by Populous Eden Project in Cornwall England Globen Sweden Dome with diameter of 110 m 1989 Biosphere 2 by John P Allen Phil Hawes Peter Jon Pearce in Oracle Arizona Jacob K Javits Convention Center New York City New York Palau Sant Jordi in Barcelona Spain by Arata Isozaki Sochi International Airport in Sochi Russia Entrance to Six Flags Magic Mountain Taiwan Taoyuan International Airport airport terminal 2 Harbin Opera House in China by Ma Yansong Hedyar Aliyev Centre in Azerbaijan by Zaha Hadid Large portable stages and lighting gantries are also frequently built from space frames and octet trusses Vehicles edit nbsp Yeoman YA 1 vs CA 6 Wackett frames Aircraft edit The CAC CA 6 Wackett and Yeoman YA 1 Cropmaster 250R aircraft were built using roughly the same welded steel tube fuselage frame Many early whirlybird style exposed boom helicopters had tubular space frame booms such as the Bell 47 series Cars edit Space frames are sometimes used in the chassis designs of automobiles and motorcycles In both a space frame and a tube frame chassis the suspension engine and body panels are attached to a skeletal frame of tubes and the body panels have little or no structural function By contrast in a unibody or monocoque design the body serves as part of the structure Tube frame chassis pre date space frame chassis and are a development of the earlier ladder chassis The advantage of using tubes rather than the previous open channel sections is that they resist torsional forces better Some tube chassis were little more than a ladder chassis made with two large diameter tubes or even a single tube as a backbone chassis Although many tubular chassis developed additional tubes and were even described as space frames their design was rarely correctly stressed as a space frame and they behaved mechanically as a tube ladder chassis with additional brackets to support the attached components suspension engine etc The distinction of the true space frame is that all the forces in each strut are either tensile or compression never bending 11 Although these additional tubes did carry some extra load they were rarely diagonalised into a rigid space frame 11 An earlier contender for the first true space frame chassis is the one off Chamberlain 8 race special built by brothers Bob and Bill Chamberlain in Melbourne Australia in 1929 12 Others attribute vehicles produced in the 1930s by designers such as Buckminster Fuller and William Bushnell Stout the Dymaxion and the Stout Scarab who understood the theory of the true space frame from either architecture or aircraft design 13 A post WW2 attempt to build a racing car space frame was the Cisitalia D46 of 1946 13 This used two small diameter tubes along each side but they were spaced apart by vertical smaller tubes and so were not diagonalised in any plane A year later Porsche designed their Type 360 for Cisitalia As this included diagonal tubes it can be considered a true space frame and arguable the first mid rear engined design 13 nbsp Jaguar C Type frame The Maserati Tipo 61 of 1959 Birdcage is often thought of as the first but in 1949 Robert Eberan von Eberhorst designed the Jowett Jupiter exhibited at that year s London Motor Show the Jowett went on to take a class win at the 1950 Le Mans 24hr Later TVR the small British car manufacturers developed the concept and produced an alloy bodied two seater on a multi tubular chassis which appeared in 1949 Colin Chapman of Lotus introduced his first production car the Mark VI in 1952 This was influenced by the Jaguar C Type chassis another with four tubes of two different diameters separated by narrower tubes Chapman reduced the main tube diameter for the lighter Lotus but did not reduce the minor tubes any further possibly because he considered that this would appear flimsy to buyers 11 Although widely described as a space frame Lotus did not build a true space frame chassis until the Mark VIII with the influence of other designers with experience from the aircraft industry 11 nbsp Chilean kitcar showing off its space frame structure 2013 A large number of kit cars use space frame construction because manufacture in small quantity requires only simple and inexpensive jigs and it is relatively easy for an amateur designer to achieve good stiffness with a space frame A drawback of the space frame chassis is that it encloses much of the working volume of the car and can make access for both the driver and to the engine difficult The Mercedes Benz 300 SL Gullwing received its iconic upward opening doors when its tubular space frame made using regular doors impossible Some space frames have been designed with removable sections joined by bolted pin joints Such a structure had already been used around the engine of the Lotus Mark III 14 Although somewhat inconvenient an advantage of the space frame is that the same lack of bending forces in the tubes that allow it to be modelled as a pin jointed structure also means that creating such a removable section need not reduce the strength of the assembled frame nbsp Moulton Bicycle at the Museum of Modern Art nbsp 2006 Ducati Monster S2R 1000 Motorcycles and bicycles edit Italian motorbike manufacturer Ducati extensively uses tube frame chassis on its models Space frames have also been used in bicycles which readily favor stressed triangular sectioning See also editBackbone chassis Body on frame Exoskeleton car Framing construction Monocoque Modular construction system Platonic solid Stressed skin Superleggera Tensegrity Tessellated roof Tetrahedral octahedral honeycombReferences edit Alexander Graham Bell Archived from the original on 2003 03 26 Alexander Graham Bell June 1903 Tetrahedral Principle In Kite Structure National Geographic Magazine XIV 6 Modular space grids Archived from the original on 2016 09 15 Unibat system Porto Claudia Estrela 2014 The innovative structural conception in Stephane du Chateau s work from metallic trusses to the development of spatial frames PDF Architectus 4 40 Poland 51 64 Archived from the original PDF on September 16 2016 Evolution of Space Frames Archived November 19 2015 at the Wayback Machine Cities Now Dorothy Harley Eber via telephone June 29 1978 Fuller on Bell Otero C 1990 Diseno geometrico de cupulas no esfericas aproximadas por mallas triangulares con un numero minimo de longitudes de barra Tesis Doctoral Universidad de Cantabria Cavia Sorret 1993 Design and Analysis of Barrel Vault Space Frame Structure www ijraset com Retrieved 2022 11 08 a b c d Ludvigsen amp Colin Chapman p 153 154 https primotipo com 2015 07 24 chamberlain 8 by john medley and mark bisset The Chamberlain An Australian Story John Hazelden a b c Ludvigsen Karl 2010 Colin Chapman Inside the Innovator Haynes Publishing pp 150 164 ISBN 1 84425 413 5 Ludvigsen amp Colin Chapman p 151 nbsp Wikimedia Commons has media related to Space frames Retrieved from https en wikipedia org w index php title Space frame amp oldid 1216482958, wikipedia, wiki, book, books, library,

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