Air-supported Structure
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An air-supported (or air-inflated) structure is any building that derives its structural integrity from the use of internal pressurized
air The atmosphere of Earth is the layer of gases, known collectively as air, retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere. The atmosphere of Earth protects life on Earth by creating pressure allowing f ...
to inflate a pliable material (i.e. structural fabric)
envelope An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a shor ...
, so that air is the main support of the structure, and where access is via airlocks. The first air-supported structure built in history was the
radome A radome (a portmanteau of radar and dome) is a structural, weatherproof enclosure that protects a radar antenna (radio), antenna. The radome is constructed of material transparent to radio waves. Radomes protect the antenna from weather and ...
manufactured at the
Cornell Aeronautical Laboratory Calspan Corporation is a science and technology company founded in 1943 as part of the Research Laboratory of the Curtiss-Wright Airplane Division at Buffalo, New York. Calspan consists of four primary operating units: Flight Research, Transportati ...
in 1948 by Walter Bird. The concept was implemented on a large scale by
David H. Geiger David H. Geiger (1935 – October 3, 1989) was an American engineer who invented the Air-supported structure, air-supported fabric roof system that at the time of his death was in use at almost half the domed stadiums in the world. Geiger was born ...
with the United States pavilion at
Expo '70 The or Expo 70 was a world's fair held in Suita, Osaka Prefecture, Japan between March 15 and September 13, 1970. Its theme was "Progress and Harmony for Mankind." In Japanese, Expo '70 is often referred to as . It was the first world's fair ...
in
Osaka, Japan is a Cities designated by government ordinance of Japan, designated city in the Kansai region of Honshu in Japan. It is the capital of and most populous city in Osaka Prefecture, and the List of cities in Japan, third most populous city in Ja ...
in 1970. It is usually dome-shaped, since this shape creates the greatest
volume Volume is a measure of occupied three-dimensional space. It is often quantified numerically using SI derived units (such as the cubic metre and litre) or by various imperial or US customary units (such as the gallon, quart, cubic inch). The de ...
for the least amount of material. To maintain structural integrity, the structure must be pressurized such that the internal
pressure Pressure (symbol: ''p'' or ''P'') is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure (also spelled ''gage'' pressure)The preferred spelling varies by country and e ...
equals or exceeds any external pressure being applied to the structure (i.e.
wind Wind is the natural movement of air or other gases relative to a planet's surface. Winds occur on a range of scales, from thunderstorm flows lasting tens of minutes, to local breezes generated by heating of land surfaces and lasting a few hou ...
pressure). The structure does not have to be airtight to retain structural integrity—as long as the pressurization system that supplies internal pressure replaces any air leakage, the structure will remain stable. All access to the structure interior must be equipped with some form of
airlock An airlock, air-lock or air lock, often abbreviated to just lock, is a compartment with doors which can be sealed against pressure which permits the passage of people and objects between environments of differing pressure or atmospheric compo ...
—typically either two sets of parallel doors or a
revolving door A revolving door typically consists of three or four doors that hang on a central shaft and rotate around a vertical axis within a cylindrical enclosure. Revolving doors are energy efficient as they, acting as an airlock, prevent drafts, thus de ...
or both. Air-supported structures are secured by heavy weights on the ground, ground anchors, attachment to a foundation, or a combination of these. Among its many uses are: sports and recreation facilities,
warehousing A warehouse is a building for storing goods. Warehouses are used by manufacturers, importers, exporters, wholesalers, transport businesses, customs, etc. They are usually large plain buildings in industrial parks on the outskirts of cities, tow ...
, temporary shelters, and
radome A radome (a portmanteau of radar and dome) is a structural, weatherproof enclosure that protects a radar antenna (radio), antenna. The radome is constructed of material transparent to radio waves. Radomes protect the antenna from weather and ...
s. The structure can be either wholly, partial, or roof-only air supported. A fully air-supported structure can be intended to be a temporary or semi-temporary facility or permanent, whereas a structure with only an air-supported roof can be built as a permanent building.


Design


Shape

The shape of an air-supported structure is limited by the need to have the whole envelope surface evenly
pressurized {{Wiktionary Pressurization or pressurisation is the application of pressure in a given situation or environment. Industrial Industrial equipment is often maintained at pressures above or below atmospheric. Atmospheric This is the process by ...
. If this is not the case, the structure will be unevenly supported, creating wrinkles and stress points in the pliable envelope which in turn may cause it to fail. In practice, any inflated surface involves a double curvature. Therefore, the most common shapes for air-supported structures are hemispheres, ovals, and half cylinders.


Structure

The main loads acting against the air-supported envelope are internal air pressure, wind, or weight from snow build-up. To compensate against wind force and snow load, the structure's inflation is adjusted accordingly. Modern structures have computer controlled mechanical systems that monitor dynamic loads and automatically compensate the inflation for it. The better the quality of the structure, the higher forces and weight it can endure. The best quality structures can withstand winds up to and snow weight to 40 pounds per square yard (21.7 kilograms per square meter). The air pressure on the envelope is equal to the air pressure exerted on the inside ground, pushing the whole structure up. Therefore, it needs to be securely anchored to the ground (or to the substructure in a roof-only design). For wide span structures cables are required for anchoring and stabilization. Anchoring requires ballast (weights). Early anchoring designs incorporated sand bags, concrete blocks, bricks, or the like, typically placed around the perimeter on the seal skirt. Most modern design structures use proprietary anchoring systems. The danger of sudden collapse is nearly negligible, because the structure will gradually deform or sag when subject to a heavy load or force (snow or wind). Only if these warning signs are ignored or not noticed, then the build-up of an extreme load may rupture the envelope, leading to a sudden deflation and collapse. A common misconception is that these structures are not meant to be permanent facilities, however all major corporations participating in this industry conform to some form of The International Building Codes. To be a permanent facility these domes have to be engineered to the same building codes as a traditional structure. Air-supported structures or domes are also commonly known as "bubbles".


Material

The materials used for air-supported structures are similar to those used in
tensile structure A tensile structure is a construction of elements carrying only tension and no compression or bending. The term ''tensile'' should not be confused with tensegrity, which is a structural form with both tension and compression elements. Tensile st ...
s, namely synthetic fabrics such as
fibreglass Fiberglass (American English) or fibreglass (Commonwealth English) is a common type of fiber-reinforced plastic using glass fiber. The fibers may be randomly arranged, flattened into a sheet called a chopped strand mat, or woven into glass clo ...
and
polyester Polyester is a category of polymers that contain the ester functional group in every repeat unit of their main chain. As a specific material, it most commonly refers to a type called polyethylene terephthalate (PET). Polyesters include natural ...
. In order to prevent deterioration from moisture and
ultraviolet Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nanometer, nm (with a corresponding frequency around 30 Hertz, PHz) to 400 nm (750 Hertz, THz), shorter than that of visible light, but longer than ...
radiation, these materials are coated with polymers such as PVC and
Teflon Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene that has numerous applications. It is one of the best-known and widely applied PFAS. The commonly known brand name of PTFE-based composition is Teflon by Chemou ...
. Depending on use and location, the structure may have inner linings made of lighter materials for insulation or acoustics. Materials used in modern air supported structures are usually translucent, therefore the use of lighting system inside the structure is not required during the daytime.


Air pressure

The interior air pressure required for air-supported structures is not as much as most people expect and certainly not discernible when inside. The amount of pressure required is a function of the weight of the material - and the building systems suspended on it (lighting, ventilation, etc.) - and wind pressure. Yet it only amounts to a small fraction of
atmospheric pressure Atmospheric pressure, also known as barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. The standard atmosphere (symbol: atm) is a unit of pressure defined as , which is equivalent to 1013.25 millibars, 7 ...
. Internal pressure is commonly measured in
inches of water Inches of water is a non- SI unit for pressure. It is also given as inches of water gauge (iwg or in.w.g.), inches water column (inch wc, in. WC, " wc, etc. or just wc or WC), inAq, Aq, or inHO. The units are conventionally used for measurement o ...
, inAq, and varies fractionally from 0.3 inAq for minimal inflation to 3 inAq for maximum, with 1 inAq being a standard pressurization level for normal operating conditions. In terms of the more common
pounds per square inch The pound per square inch or, more accurately, pound-force per square inch (symbol: lbf/in2; abbreviation: psi) is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to ...
, 1 inAq equates to a mere 0.037 psi (2.54 mBar, 254 Pa).


Notable air-supported domes


In operation

* Bennett Indoor Athletic Complex,
Toms River, New Jersey Toms River is a township in Ocean County, New Jersey, United States. Its mainland portion is also a census-designated place of the same name, which serves as the county seat of Ocean County.Dalplex (athletics complex), Halifax,
Nova Scotia Nova Scotia ( ; ; ) is one of the thirteen provinces and territories of Canada. It is one of the three Maritime provinces and one of the four Atlantic provinces. Nova Scotia is Latin for "New Scotland". Most of the population are native Eng ...
,
Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...
*
Olympic Training Center Velodrome The Olympic Training Center Velodrome, also known as the 7-11 Velodrome, is a velodrome in Colorado Springs, Colorado. The track is surfaced with concrete, which is unusual as Olympic-quality tracks tend to be timber or synthetics. It was built i ...
,
Colorado Springs Colorado Springs is a home rule municipality in, and the county seat of, El Paso County, Colorado, United States. It is the largest city in El Paso County, with a population of 478,961 at the 2020 United States Census, a 15.02% increase since ...
,
Colorado Colorado (, other variants) is a state in the Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the western edge of t ...
,
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
*
Edmonton Soccer Dome The Edmonton Soccer Dome is an air-supported structure located in Edmonton, Canada. Predominately used for soccer, the facility stands tall and features a FieldTurf CORE artificial turf playing surface that covers , making it the largest spo ...
,
Edmonton Edmonton ( ) is the capital city of the Canadian province of Alberta. Edmonton is situated on the North Saskatchewan River and is the centre of the Edmonton Metropolitan Region, which is surrounded by Alberta's central region. The city ancho ...
,
Alberta Alberta ( ) is one of the thirteen provinces and territories of Canada. It is part of Western Canada and is one of the three prairie provinces. Alberta is bordered by British Columbia to the west, Saskatchewan to the east, the Northwest Ter ...
,
Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...
* Harry Jerome Sports Center,
Burnaby, British Columbia Burnaby is a city in the Lower Mainland region of British Columbia, Canada. Located in the centre of the Burrard Peninsula, it neighbours the City of Vancouver to the west, the District of North Vancouver across the confluence of the Burrard Inl ...
, Canada. *
Krenzler Field Krenzler Field is a soccer stadium in Cleveland, Ohio on the campus of Cleveland State University (CSU). It serves as the home field to the CSU men's and women's varsity soccer teams, the CSU varsity men's lacrosse team, and formerly the Clevela ...
,
Cleveland State University Cleveland State University (CSU) is a public research university in Cleveland, Ohio. It was established in 1964 and opened for classes in 1965 after acquiring the entirety of Fenn College, a private school that had been in operation since 1923. ...
,
Cleveland, Ohio Cleveland ( ), officially the City of Cleveland, is a city in the U.S. state of Ohio and the county seat of Cuyahoga County. Located in the northeastern part of the state, it is situated along the southern shore of Lake Erie, across the U.S. ...
, United States *
Tokyo Dome is an indoor stadium in Bunkyo, Tokyo, Japan. It was designed as a baseball stadium following its predecessor, Korakuen Stadium. Construction on the stadium began on May 16, 1985, and it opened on March 17, 1988. It was built on the site of th ...
,
Tokyo Tokyo (; ja, 東京, , ), officially the Tokyo Metropolis ( ja, 東京都, label=none, ), is the capital and largest city of Japan. Formerly known as Edo, its metropolitan area () is the most populous in the world, with an estimated 37.468 ...
,
Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...


Former notable domes

*
BC Place BC Place is a multi-purpose stadium in Vancouver, British Columbia, Canada. Located at the north side of False Creek, it is owned and operated by the BC Pavilion Corporation (PavCo), a crown corporation of the province. The venue is currently ...
,
Vancouver Vancouver ( ) is a major city in western Canada, located in the Lower Mainland region of British Columbia. As the List of cities in British Columbia, most populous city in the province, the 2021 Canadian census recorded 662,248 people in the ...
,
British Columbia British Columbia (commonly abbreviated as BC) is the westernmost province of Canada, situated between the Pacific Ocean and the Rocky Mountains. It has a diverse geography, with rugged landscapes that include rocky coastlines, sandy beaches, ...
,
Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...
(Formerly the largest air-supported stadium in the world. The roof was changed to a retractable roof in 2011) *
Greater Binghamton Sports Complex The Greater Binghamton Sports Complex was an air-supported dome in Union, New York. With over in enclosed area, it was the largest air-supported dome in the United States. The complex was located on Airport Road off Route 17 near the city of Bing ...
,
Binghamton, New York Binghamton () is a city in the U.S. state of New York, and serves as the county seat of Broome County. Surrounded by rolling hills, it lies in the state's Southern Tier region near the Pennsylvania border, in a bowl-shaped valley at the conflue ...
, United States. (Roof collapsed in December 2020) *
Burswood Dome The Dome at Crown Perth (originally the Burswood Superdome and formerly the Burswood Dome) was a multipurpose indoor arena used for sports and entertainment. The dome was in size, with seating for 13,600 people. The whole arena was pressurised s ...
,
Perth, Western Australia Perth is the capital and largest city of the Australian state of Western Australia. It is the fourth most populous city in Australia and Oceania, with a population of 2.1 million (80% of the state) living in Greater Perth in 2020. Perth is ...
(Demolition commenced June 2013) *
Carrier Dome The JMA Wireless Dome, originally the Carrier Dome (1980–2022) and colloquially called "The Dome," or more recently "The JMA Dome," is a domed sports stadium in Syracuse, New York. Located on the campus of Syracuse University in the University ...
,
Syracuse, New York Syracuse ( ) is a City (New York), city in and the county seat of Onondaga County, New York, Onondaga County, New York, United States. It is the fifth-most populous city in the state of New York following New York City, Buffalo, New York, Buffa ...
, United States (air-supported roof was deflated for the final time on March 16, 2020, with a steel frame-supported roof installed that September) *
DakotaDome The DakotaDome is an indoor multi-purpose stadium in the north central United States, located on the campus of the University of South Dakota in Vermillion, South Dakota. Opened in 1979 at a cost of $8.2 million, the 9,100-seat venue is th ...
,
Vermillion, South Dakota Vermillion ( lkt, Waséoyuze; "The Place Where Vermilion is Obtained") is a city in and the county seat of Clay County. It is in the southeastern corner of South Dakota, United States, and is the state's 12th-largest city. According to the 2020 ...
,
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
(air-supported roof was replaced by a steel frame domed roof in 2001) * Donald N. Dedmon Center,
Radford, Virginia Radford (formerly Lovely Mount, Central City, English Ferry and Ingle's Ferry) is an independent city in the U.S. state of Virginia. As of 2020, the population was 16,070 by the United States Census Bureau. For statistical purposes, the Bureau ...
,
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
(air-supported roof was replaced by a steel truss and fabric roof in 2009) *
Hubert H. Humphrey Metrodome The Hubert H. Humphrey Metrodome (commonly called the Metrodome) was a domed sports stadium located in downtown Minneapolis, Minnesota. It opened in 1982 as a replacement for Metropolitan Stadium, the former home of the National Football League ...
,
Minneapolis, Minnesota Minneapolis () is the largest city in Minnesota, United States, and the county seat of Hennepin County. The city is abundant in water, with thirteen lakes, wetlands, the Mississippi River, creeks and waterfalls. Minneapolis has its origins ...
, United States (Roof deflated January 18, 2014, demolished in February 2014) *
O'Connell Center The Stephen C. O'Connell Center, also known as the O'Dome, is a 10,500-seat multi-purpose arena located on the University of Florida campus in Gainesville, Florida. The facility is named for the sixth president of the university, Stephen C. O' ...
,
Gainesville, Florida Gainesville is the county seat of Alachua County, Florida, Alachua County, Florida, and the largest city in North Central Florida, with a population of 141,085 in 2020. It is the principal city of the Gainesville metropolitan area, Florida, Gaine ...
,
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
(air-supported roof was replaced by a steel frame-supported roof in 1998) *
RCA Dome The RCA Dome (originally Hoosier Dome) was a domed stadium in Indianapolis. It was the home of the Indianapolis Colts NFL franchise for 24 seasons (1984– 2007). It was completed at a cost of $77.5 million, as part of the Indiana Convention Ce ...
,
Indianapolis, Indiana Indianapolis (), colloquially known as Indy, is the state capital and most populous city of the U.S. state of Indiana and the seat of Marion County. According to the U.S. Census Bureau, the consolidated population of Indianapolis and Mari ...
,
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
(demolished in December 2008) *
Pontiac Silverdome The Pontiac Silverdome (also known simply as the Silverdome) was a stadium in Pontiac, Michigan. It opened in 1975 and sat on 199 acres (51 ha) of land. When the stadium opened, it featured a fiberglass fabric roof held up by air pressure, ...
,
Pontiac, Michigan Pontiac ( ') is a city in and the county seat of Oakland County in the U.S. state of Michigan. As of the 2020 census, the city had a total population of 61,606. A northern suburb of Metro Detroit, Pontiac is about northwest of Detroit. Founde ...
,
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
(deflated in early January 2013; demolished December 2017) *
St. Louis Science Center The Saint Louis Science Center, founded as a planetarium in 1963, is a collection of buildings including a science museum and planetarium in St. Louis, Missouri, on the southeastern corner of Forest Park. With over 750 exhibits in a complex of ...
Exploradome,
St. Louis, Missouri St. Louis () is the second-largest city in Missouri, United States. It sits near the confluence of the Mississippi River, Mississippi and the Missouri Rivers. In 2020, the city proper had a population of 301,578, while the Greater St. Louis, ...
,
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
(Demolished in 2013) *
UNI-Dome UNI-Dome (pronounced "YOU-nih-dome") is a multi-purpose stadium, on the campus of the University of Northern Iowa, in Cedar Falls, Iowa, United States. It opened in 1976, as the home of the UNI Panthers basketball and football teams. The facili ...
,
Cedar Falls, Iowa Cedar Falls is a city in Black Hawk County, Iowa, United States. As of the 2020 census, the city population was 40,713. It is home to the University of Northern Iowa, a public university. History Cedar Falls was first settled in March 1845 by ...
,
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
(air-supported Teflon/Fiberglass roof was replaced with a steel frame-supported stainless steel/fiberglass roof in 1998) *
Yuengling Center Yuengling Center (formerly the USF Sun Dome) is an indoor arena on the main campus of the University of South Florida (USF) in Tampa, Florida. Construction began in November 1977, and it opened on November 29, 1980. It is located in USF's Athl ...
(originally USF Sun Dome),
Tampa, Florida Tampa () is a city on the Gulf Coast of the United States, Gulf Coast of the U.S. state of Florida. The city's borders include the north shore of Tampa Bay and the east shore of Old Tampa Bay. Tampa is the largest city in the Tampa Bay area and ...
, United States (air-supported Teflon/Fiberglass roof was replaced with a steel frame-supported roof in 2012)


Similar concepts

*
Blimps A blimp, or non-rigid airship, is an airship (dirigible) without an internal structural framework or a keel. Unlike semi-rigid and rigid airships (e.g. Zeppelins), blimps rely on the pressure of the lifting gas (usually helium, rather than hyd ...
, the application of this technique to
airships An airship or dirigible balloon is a type of aerostat or lighter-than-air aircraft that can navigate through the air Powered aircraft, under its own power. Aerostats gain their lift from a lifting gas that is less dense than the surrounding a ...
, using the pressure differential between their
lifting gas A lifting gas or lighter-than-air gas is a gas that has a density lower than normal atmospheric gases and rises above them as a result. It is required for aerostats to create buoyancy, particularly in lighter-than-air aircraft, which include ballo ...
and the outside atmosphere to provide structural integrity. *
Balloon tank A balloon tank is a style of propellant tank used in the SM-65 Atlas intercontinental ballistic missile (ICBM) and Centaur upper stage that does not use an internal framework, but instead relies on a positive internal pressurization to keep it ...
s, the application of this technique to rockets, using tank pressurization for rigidity.


References


External links


Tension Structures

DESIGN MANUAL FOR GROUND-MOUNTED AIR-SUPPORTED STRUCTURES
{cbignore, bot=medic
GUIDE FOR ESTIMATING MAXIMUM ANCHOR LOADS ON AIR-SUPPORTED STRUCTURES
Buildings and structures by type Tensile architecture Tensile membrane structures