Hurricane-proof building
Encyclopedia
Tornadoes, cyclones, and other strong winds damage or destroy many buildings. However, with proper design and construction, the damage to buildings by these forces can be greatly reduced. A variety of methods can help a building survive strong winds and storm surge.
Several methods can be used to anchor the roof. Typically, roof trusses are "toenailed" into the top of the walls, which provide insufficient force to resist high winds. Hurricane ties nail into the wall and wrap over the trusses provide higher force resistance.
To mitigate this pressure differential, pre-installed aluminum tabular channels can permanently be fastened perpendicularly across the top of the interlocking ribs of the metal roof system without disturbing the flow of rainwater at the eaves, mid-span, and ridge locations of the building.
construction is generally more resistant to strong winds and tornadoes than standard construction. Cellars and other earth sheltered components of other buildings, can provide safe refuge during tornadoes.
construction. Monolithic Domes are both the name of a company and the construction technique they developed for building domes.
In short the Monolithic dome building technique is to put up an strong rubberized air supported bubble, spray foam on the inside of it, place reinforcing bar on the inside of the foam, spray several thin layers of concrete mixture on the inside of the foam/reinforcing bar structure. The domes are normally 4 to 8" thick reinforced concrete, and according to Monolithic Domes, are very energy efficient. Their arguments are documented on their web site. They sell doors made by another manufacturer that are up to F5 tornado rated (by testing at Texas Tech University WISE laboratories) for use in their domes if the customer desires. Monolithic sells the rubberized envelopes, support equipment, training, consulting, and sometimes construction services.
A geodesic dome could be enclosed in an concrete envelope, would still not be considered a Monolithic dome. Both structures provide many benefits, but they are inherently different in structural nature. More information on Geodesic domes is available at the Buckminster Fuller Institute web site.
. Some doors can resist high winds. Some companies offer retrofit devices.
is a strong, dense material that, if used in a building that is designed properly, can withstand the destructive power of very high winds, and high-speed debris.
Northern Australia
Storm surge considerations
Waves along coastal areas can literally destroy a building. Buildings should preferably be built on high ground in order to avoid waves. If waves can reach the building site, the building ought to be elevated on steel, concrete, or wooden pilings or anchored to solid rock.The foundation
Wind acting on the roof surfaces of a building can cause negative pressures that create a lifting force sufficient to lift the roof off the building. Once this occurs, the building is weakened considerably and the rest of the building will be likely fail as well. To minimize this, the upper structure ought to be anchored through the walls to the foundation.Several methods can be used to anchor the roof. Typically, roof trusses are "toenailed" into the top of the walls, which provide insufficient force to resist high winds. Hurricane ties nail into the wall and wrap over the trusses provide higher force resistance.
Mobile home tie down to the foundation
Interlocking metal pan roof systems installed on mobile homes can fail under the pressure differential (lift) created by the high velocity winds passing over the surface plane of the roof. This is compounded by the wind entering the building allowing the building interior to pressurize lifting the underside of the roof panels, resulting in destruction of the building. One example of pan roof systems can be found in this document from Structall Building Systems.To mitigate this pressure differential, pre-installed aluminum tabular channels can permanently be fastened perpendicularly across the top of the interlocking ribs of the metal roof system without disturbing the flow of rainwater at the eaves, mid-span, and ridge locations of the building.
Earth sheltering
Earth shelteredEarth sheltering
Earth sheltering is the architectural practice of using earth against building walls for external thermal mass, to reduce heat loss, and to easily maintain a steady indoor air temperature...
construction is generally more resistant to strong winds and tornadoes than standard construction. Cellars and other earth sheltered components of other buildings, can provide safe refuge during tornadoes.
Dome homes
The physical geometry of a building affects its aerodynamic properties and how well it can withstand a storm. Geodesic dome roofs or buildings have low drag coefficients and can withstand higher wind forces than a square building of the same area. Even stronger buildings result from monolithic domeMonolithic dome
A monolithic dome is a structure cast in a one-piece form. The form may be permanent or temporary and may or may not remain part of the finished structure....
construction. Monolithic Domes are both the name of a company and the construction technique they developed for building domes.
In short the Monolithic dome building technique is to put up an strong rubberized air supported bubble, spray foam on the inside of it, place reinforcing bar on the inside of the foam, spray several thin layers of concrete mixture on the inside of the foam/reinforcing bar structure. The domes are normally 4 to 8" thick reinforced concrete, and according to Monolithic Domes, are very energy efficient. Their arguments are documented on their web site. They sell doors made by another manufacturer that are up to F5 tornado rated (by testing at Texas Tech University WISE laboratories) for use in their domes if the customer desires. Monolithic sells the rubberized envelopes, support equipment, training, consulting, and sometimes construction services.
A geodesic dome could be enclosed in an concrete envelope, would still not be considered a Monolithic dome. Both structures provide many benefits, but they are inherently different in structural nature. More information on Geodesic domes is available at the Buckminster Fuller Institute web site.
Openings
Building openings such as relatively weak garage doors and windows are often weak points susceptible to failure by wind pressure and blowing debris. Once failure occurs, wind pressure builds up inside the building resulting in the roof lifting off the building. Hurricane shutters can provide protection.Doors
Doors can be blown into the house by wind causing potential structural failureStructural failure
Structural failure refers to loss of the load-carrying capacity of a component or member within a structure or of the structure itself. Structural failure is initiated when the material is stressed to its strength limit, thus causing fracture or excessive deformations...
. Some doors can resist high winds. Some companies offer retrofit devices.
Windows
Windows can be constructed with plastic panes, shatter-proof glass, or glass with protective membranes. The panes are often more firmly attached than normal window panes, including using screws or bolts through the edges of larger panes.Wood
Wood has a relatively high degree of flexibility which can be beneficial under certain building stresses.Concrete
Reinforced concreteReinforced concrete
Reinforced concrete is concrete in which reinforcement bars , reinforcement grids, plates or fibers have been incorporated to strengthen the concrete in tension. It was invented by French gardener Joseph Monier in 1849 and patented in 1867. The term Ferro Concrete refers only to concrete that is...
is a strong, dense material that, if used in a building that is designed properly, can withstand the destructive power of very high winds, and high-speed debris.
Examples of cyclonic construction methods
Residential construction in DarwinDarwin, Northern Territory
Darwin is the capital city of the Northern Territory, Australia. Situated on the Timor Sea, Darwin has a population of 127,500, making it by far the largest and most populated city in the sparsely populated Northern Territory, but the least populous of all Australia's capital cities...
Northern Australia
Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...
See also
- Dymaxion houseDymaxion houseThe Dymaxion House was developed by inventor and architect Buckminster Fuller to address several perceived shortcomings with existing homebuilding techniques. Fuller designed several versions of the house at different times, but they were all factory manufactured kits, assembled on site, intended...
- Hurricane preparednessHurricane preparednessHurricane preparedness encompasses the actions and planning taken before a tropical cyclone strikes to mitigate damage and injury from the storm...
- HurriQuakeHurriQuakeThe HurriQuake nail is a construction nail designed by Ed Sutt for Bostitch, a division of Stanley Works, and patented in 2004. The features of the nail are designed primarily to provide more structural integrity for a building, especially against the forces of hurricanes and earthquakes.-Features...
nail (for resisting hurricanes and earthquakes) - Structural design
- Structural engineeringStructural engineeringStructural engineering is a field of engineering dealing with the analysis and design of structures that support or resist loads. Structural engineering is usually considered a specialty within civil engineering, but it can also be studied in its own right....
- Windstorm inspectionWindstorm inspectionA windstorm inspection, also referred to as a "windstorm mitigation inspection", windstorm insurance inspection or "Wind Mitigation Inspection", is a kind of home inspection common in the coastal areas of the Southeastern United States...