ce 10 how to withstand typhoons or annual events 2

8/12/2019 CE 10 How to Withstand Typhoons or Annual Events 2

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Exposure B

Suburban Residential Areas with mostly single-family dwellings. Structures in the

center of the photograph have sites designated as exposure B with surface roughness

category B terrain around the site for a distance greater than 1500 ft. or ten times the

height of the structure, whichever is greater, in any wind direction


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Exposure B

Urban area with numerous closely-spaced obstructions having the size of single-family

dwellings or larger. For all structures shown, terrain representative or surface

roughness category B extends more than 10 times the height of the structure or 800 m,

whichever is greater, in the upwind direction.


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Exposure B and Exposure C

Structures in the foreground are located in exposure B. Structures in the center top of

the photograph adjacent to the clearing to the left, which is greater than 200 m in

length, are located in exposure C when wind comes from the left over the clearing.


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Exposure C

Flat open grassland with scattered obstructions having heights generally less than 30 ft.


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Exposure C

Open terrains with scattered obstructions having heights generally less than 30 ft for

most wind directions, all one-storey structure with mean roof height less than 30-ft are

less than 1500 ft. or ten times the height of the structure, whichever is greater, from an

open field that prevents the use of exposure B.


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Exposure D

A building at the shoreline (excluding shorelines in the hurricane-prone regions) with

wind flowing over open water for a distance of at least 1 mile.


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ce 10 how to withstand typhoons or annual events 2

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