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Site Class B

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learning2geotech

learning2geotech

Civil/Environmental
Apr 4, 2019
38
ASCE 7-22 states "Classes A and B shall not be assigned to a site if there is more than 10 feet of soil between the rock surface and the bottom of the spread footing or mat foundation." If my measured shear wave velocity is greater than 3000 ft/s (minimum requirement for Class B) but only half of the building meets the rock distance requirement, can I still assign a Class B to the site?
 
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My interpretation of ASCE 7 would be that you cannot assign the site Class B since it does not meet the requirements of 10 feet or less of soil below the foundation.
 
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