Expssure Category
Expssure Category
(OP)
Hi,
I am designing a 75 foot tall building. A fellow engineer told me that the exposure category of the building can change as the building height increases. For example the first few floors are designed for exposure B and the top floor could be designed for exposure category C. I have never heard of this. Does any one know if this is true? Or where in the code it would explain that? Our building is an exposure category B, in NY state.
Thanks for the help!!!
I am designing a 75 foot tall building. A fellow engineer told me that the exposure category of the building can change as the building height increases. For example the first few floors are designed for exposure B and the top floor could be designed for exposure category C. I have never heard of this. Does any one know if this is true? Or where in the code it would explain that? Our building is an exposure category B, in NY state.
Thanks for the help!!!






RE: Expssure Category
RE: Expssure Category
I would design the entire building with the same exposure category?
RE: Expssure Category
RE: Expssure Category
Yes. The exposure does not vary with building height. Exposure accounts for the terrain around the structure, and makes adjustments to the power-law equation and the atmospheric boundary layer height, based on the terrain. Height effects are accounted for in Kz.
RE: Expssure Category
26.7 EXPOSURE
"For each wind direction, the upwind exposure shall be based on ground surface roughness, that is determined from natural topography, vegetation, and constructed facilities."
RE: Expssure Category
RE: Expssure Category
RE: Expssure Category
Dik