is a(lattice-shell) based on a network ofgeodesicsgreat circles) on the surface of asphereor a hemisphere. The geodesics intersect to formtriangularelements, which have local, triangular rigidity, and so distribute the structuralstressthroughout the
The design of a geodesic dome begins with anicosahedron(20-side form) inscribed within a hypothetical sphere. Each triangular face of the icosahedron is subdivided inton2,nbeing the chosen degree of subdivision. The small triangles vertices are then projected onto the sphere, carrying the arrangement of edges along with them.
When fitted exactly, the sub-triangle edge-lengths assume different values, which thus requires links of many sizes to form the structure (spherical or hemispherical). To minimize the number of different values for the edge-lengths, the design is simplified, and the resultant geodesic dome is a compromise of triangles with the vertices lying approximately on the sphere, so that the triangle-edges form approximate geodesic paths over the surface of the geodesic dome.
WhileSpaceship Earthmay be referred to as a geodesic dome, it is actually a geodesic sphere, because it is raised off the ground and is a complete sphere, while a dome is only part of a sphere.
The Climatrongreenhouse atMissouri Botanical Gardens, built in 1960 and designed by Thomas C. Howard of Synergetics, Inc., inspired the domes in the science fiction movie
The first dome that could be called geodesic in every respect was designed afterWorld War IbyWalther Bauersfeld,chief engineer of theCarl Zeissoptical company, for aplanetariumto house his planetarium projector. A first, small dome was patented, constructed by the firm of Dykerhoff and Wydmann on the roof of the Zeiss plant inJenaGermany. A larger dome, called The Wonder of Jena opened to the public in July 1926.Some 20 years later,R. Buckminster Fullernamed the dome geodesic lattice of interlocking icosahedrons that could be skinned with a protective cover. Although Fuller was not the original inventor, he is credited with the U.S. popularization of the idea for which he received U.S. patent 2,682,23529 June 1954.
The geodesic dome appealed to Fuller because it was extremely strong for its weight, its omnitriangulated surface provided an inherently stable structure, and because a sphere encloses the greatest volume for the least surface area.
The dome was successfully adopted for specialized uses, such as the 21Distant Early Warning Linedomes built in Canada in 1956,the 1958Union Tank Car Companydome nearBaton Rouge, Louisianadesigned by Thomas C. Howard of Synergetics, Inc. and specialty buildings like theKaiser Aluminumdomes (constructed in numerous locations across the US, e.g.,Virginia Beach, VA), auditoriums, weather observatories, and storage facilities. The dome was soon breaking records for covered surface, enclosed volume, and construction speed.
Beginning in 1954, the U.S. Marines experimented withhelicopter-deliverable geodesic domes. A 30-foot wood and plastic geodesic dome was lifted and carried by helicopter at 50 knots without damage, leading to the manufacture of a standard magnesium dome by Magnesium Products of Milwaukee. Tests included assembly practices in which previously untrained Marines were able to assemble a 30-foot magnesium dome in 135 minutes, helicopter lifts off aircraft carriers, and a durability test in which an anchored dome successfully withstood a day-long120mph (190km/h)propeller blast from the twin 3,000 horsepower engines of an anchored airplane without damage.
The dome was introduced to a wider audience as a pavilion for the 1964Worlds FairinNew York Citydesigned by Thomas C. Howard of Synergetics, Inc. This dome is now used as anaviaryby theQueens Zooin Flushing Meadows Corona Park after it was redesigned by TC Howard of Synergetics, Inc.
Another dome is fromExpo 67at the, where it was part of the American Pavilion. The structures covering later burned, but the structure itself still stands and, under the nameBiosphre,currently houses an interpretivemuseumabout theSaint Lawrence River.
A dome appeared in the 1967James BondfilmYou Only Live Twice, inspiring the production designer ofAustin PowersThe Spy Who Shagged Meto use a dome for Dr Evils moon base.
In 1975, a dome was constructed at theSouth Pole, where its resistance to snow and wind loads is important.
On October 1, 1982, one of the most famous geodesic domes,Spaceship Earthat theEPCOT CenterinWalt Disney WorldBay Lake, Florida), opened. The building and the ride inside of it are named with one of Buckminster Fullers famous terms,Spaceship Earth, a world view expressing concern over the use of limited resources available on Earth and encouraging everyone on it to act as a harmonious crew working toward the greater good. The building isEpcots icon, and is also included in the parks logo.
In the year 2000 the worlds first fully sustainable geodesic dome hotel, EcoCamp Patagonia, was built inopening the following year in 2001. The hotels dome design is key to resisting the regions strong winds and is based on the dwellings of the indigenousKaweskar people.
Wooden domes have a hole drilled in the width of astrut. A stainless steel band locks the struts hole to a steel pipe. With this method, the struts may be cut to the exact length needed. Triangles of exterior plywood are then nailed to the struts. The dome is wrapped from the bottom to the top with several stapled layers oftar paper, in order to shed water, and finished with shingles. This type of dome is often called a hub-and-strut dome because of the use of steel hubs to tie the struts together.
Panelized domes are constructed of separately framed timbers covered in plywood. The three members comprising the triangular frame are often cut at compound angles in order to provide for a flat fitting of the various triangles. Holes are drilled through the members at precise locations and steel bolts then connect the triangles to form the dome. These members are often 2x4s or 2x6s, which allow for moreinsulationto fit within the triangle. The panelized technique allows the builder to attach the plywood skin to the triangles while safely working on the ground or in a comfortable shop out of the weather. This method does not require expensive steel hubs.
Temporary greenhouse domes have been constructed by stapling plastic sheeting onto a dome constructed from one-inch square beams. The result is warm, movable by hand in sizes less than 20 feet, and cheap. It should be staked to the ground to prevent it being moved by wind.
Steel-framework can be easily constructed of electrical conduit. One flattens the end of a strut and drills bolt holes at the needed length. A single bolt secures a vertex ofstruts. The nuts are usually set with removable locking compound, or if the dome is portable, have acastellated nutwith acotter pin. This is the standard way to construct domes forjungle gyms.
Domes can also be constructed with a lightweight aluminium framework which can either be bolted or welded together or can be connected with a more flexible nodel point/hub connection. These domes are usually clad with glass which is held in place with a PVC coping. The coping can be sealed with silicone to make it water tight. Some designs will also allow for double glazing or insulated panels to be fixed in the framework. This allows a fully habitable building to be formed.
Concrete and foam plastic domes generally start with a steel framework dome, wrapped with chicken wire and wire screen for reinforcement. Thechicken wireand screen is tied to the framework with wire ties. A coat of material is then sprayed or molded onto the frame. Tests should be performed with small squares to achieve the correct consistency of concrete or plastic. Generally, several coats are necessary on the inside and outside. The last step is to saturate concrete or polyester domes with a thin layer ofepoxycompound to shed water.
Some concrete domes have been constructed from prefabricated, prestressed, steel-reinforced concrete panels that can be bolted into place. The bolts are within raised receptacles covered with little concrete caps to shed water. The triangles overlap to shed water. The triangles in this method can be molded in forms patterned in sand with wooden patterns, but the concrete triangles are usually so heavy that they must be placed with a crane. This construction is well-suited to domes because there is no place for water to pool on the concrete and leak through. The metal fasteners, joints, and internal steel frames remain dry, preventing frost and corrosion damage. The concrete resists sun and weathering. Some form of internal flashing or caulking must be placed over the joints to prevent drafts. The 1963Cinerama Domewas built fromprecast concretehexagons and pentagons.
Fuller hoped that the geodesic dome would help address the postwar housing crisis. This was consistent with his prior hopes for both versions of theDymaxion House.
Residential geodesic domes have been less successful than those used for working and/or entertainment, largely because of their complexity and consequent greater construction costs. Professional experienced dome contractors, while hard to find, do exist, and can eliminate much of the cost overruns associated with false starts and incorrect estimates. Fuller himself lived in a geodesic dome inCarbondale, Illinois, at the corner of Forest and Cherry.Fuller thought of residential domes as air-deliverable products manufactured by an aerospace-like industry. Fullers own dome home still exists, theR. Buckminster Fuller and Anne Hewlett Dome Home, and a group called RBF Dome NFP is attempting to restore the dome and have it registered as aNational Historic Landmark.
In 1986 a patent for a dome construction technique involvingEPStriangles laminated to reinforced concrete on the outside, and wallboard on the inside was awarded to American Ingenuity of Rockledge Florida. The construction technique allows the domes to be prefabricated in kit form and erected by a homeowner. This method makes the seams into the strongest part of the structure, where the seams and especially the hubs in most wooden-framed domes are the weakest point in the structure. It also has the advantage of being watertight.
Habitable aluminium frame geodesic dome homes are emerging in Norway and Austria. 2012 saw an Aluminium and glass dome being used as a dome cover to an eco home in Norwayand in 2013 a glass and wood clad dome home was built in Austria.
In Chile and Finland there are examples of geodesic domes being readily adopted for hotel accommodation either as tented style geodesic domes or glass covered domes. Examples: EcoCamp Patagonia, Chile;Elqui Domos, Chile;and Hotel Kakslauttanen, Finland.
Although dome homes enjoyed a wave of popularity in the late 1960s and early 1970s, as a housing system the dome has many disadvantages and problems. A former proponent of dome homes,Lloyd Kahn, who wrote two books about them (Domebook 1andDomebook 2) and founded Shelter Publications, became disillusioned with them, calling them smart but not wise.He noted the following disadvantages, which he has listed on his companys website:
The shape of a dome house makes it difficult to conform to code requirements for placement ofsewer ventsandchimneys. Off-the-shelf building materials (e.g., plywood, strand board) normally come in rectangular shapes, therefore some material may have to be scrapped after cutting rectangles down to triangles, increasing the cost of construction. Fire escapes are problematic; codes require them for larger structures, and they are expensive. Windows conforming to code can cost anywhere from 5 to 15 times as much as windows in conventional houses. Professional electrical wiring costs more because of increased labor time. Even owner-wired situations are costly, because more of certain materials are required for dome construction.
Air stratification and moisture distribution within a dome are unusual. The conditions tend to quickly degrade wooden framing or interior paneling. A company called New Age Construction in Alabama claims that an addition of acupolaeliminates the moisture condensation that is common in domes.
Privacy is difficult to guarantee because a dome is difficult to partition satisfactorily. Sounds, smells, and even reflected light tend to be conveyed through the entire structure (but in some cases this can be used to advantage).
As with any curved shape, the dome produces wall areas that can be difficult to use and leaves some peripheral floor area with restricted use due to lack of headroom. Circular plan shapes lack the simple modularity provided by rectangles. Furnishers and fitters design for flat surfaces in mind. Placing a standard sofa against an exterior wall (for example) results in a crescent behind the sofa being wasted.
Dome builders using cut-board sheathing material (common in the 1960s and 1970s) find it hard to seal domes against rain, because of their many seams. Also, these seams may be stressed because ordinary solar heat flexes the entire structure each day as the sun moves across the sky. Subsequent addition of straps and interior flexible drywall finishes has virtually eliminated this movement being noticed in the interior finishes.
The most effective waterproofing method with a wooden dome is toshinglethe dome. Peaked caps at the top of the dome, or to modify the dome shapes are used where slope is insufficient for ice barrier. One-piece reinforcedconcreteorplasticdomes are also in use, and some domes have been constructed from plastic or waxed cardboard triangles that are overlapped in such a way as to shed water. Buckminster Fullers former studentJ. Baldwininsists that there is no reason for a properly designed, well-constructed dome to leak, and that some designscannotleak.
InGeodesic Math and How to Use ItHugh Kennerwrites, Tables of chord factors, containing as they do the essential design information for spherical systems, were for many years guarded like military secrets. As late as 1966, some 3icosa figures fromPopular Science Monthlywere all anyone outside the circle of Fuller licensees had to go on. (page 57, 1976 edition). Other tables became available with publication of Lloyd KahnsDomebook 1(1970) andDomebook 2(1971). With advent of personal computers, the mathematics became more solvable. Rick BonosDomesoftware outputs a script that can be used with theto produce 3D pictures of domes. Domes based on the frameworks of different underlying polyhedra along with various methods for subdividing them will produce quite different results. Mathematical formulas developed by Peter W. Messer for calculating chord factors anddihedral anglesfor the general geodesic sphere appear in the Appendix of the 1999 Dover edition ofbyMagnus J. Wenninger.
Similar geodesic structures may be based upon the pattern of edges and vertices of certainPlatonic solids, or upon various expansions of these calledJohnson solids. Such structures may be composed of struts of uniform length while having faces other than triangles such as pentagons or squares, or these faces may be subdivided by struts of other than the basic length. Plans and licenses for such structures derived from licenses of the Fuller patents were produced during the 1970s byZomeworks(now a manufacturer ofsolar trackers). Both geodesic and non-geodesic structures can be derived similarly from theArchimedean solidsandCatalan solids.
The building of strong stable structures out of patterns of reinforcing trianglesis most commonly seen intentdesign. It has been applied in the abstract in otherindustrial design, but even inmanagement scienceand deliberativestructuresas aconceptual metaphor, especially in the work ofStafford Beer, whosetransmigrationmethod is based so specifically on dome design that only fixed numbers of people can take part in the process at eachdeliberationstage.
Thedual polyhedronof icosahedral geodesic spheres giveGoldberg polyhedra.
Many geodesic domes built are still in use. According to the Buckminster Fuller Institute,the worlds ten largest domes are:
Tacoma DomeTacoma, Washington, USA,
Superior DomeNorthern Michigan UniversityMarquette, Michigan, USA,
Walkup SkydomeNorthern Arizona UniversityFlagstaff, Arizona, USA,
Poliedro de Caracas, Venezuela designed and manufactured by TC Howard of Synergetics, Inc and Charter Industries
Round Valley EnsphereSpringervilleEagar, AZ, USA,
FormerSpruce GooseHangar:Long Beach, California, USA,
Formosa Plastics Storage Facility: Mai Liao, Taiwan,
Buckminsterfullerenes, molecules which resemble the geodesic dome structure
1972 science fiction film prominently featuring geodesic domes.
An online Cyberpunk RPG that takes place in a giant geodesic dome.
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naturhuset – Vi skal bygge et Naturhus og en selvforsynende hage pĺ Sandhornřya i Nordland. Prosjektet er sterkt inspirert av arkitekt Bengt Warne, den russiske Bokserien The Ringing Cedars series og vĺr inderlige kjćrlighet og dype respekt for Moder Jord. Naturhuset.blogg.no
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