14B-16-1610  Soil lateral loads.
The provisions of Section 1610 of IBC are adopted by reference with the following modifications:
1.   Revise Section 1610.1, excluding the exception, to read:
1610.1 General.
Foundation walls and retaining walls shall be designed to resist lateral soil loads. Soil loads specified in Table 1610.1 shall be used as the minimum design lateral soil loads unless determined otherwise by a geotechnical investigation in accordance with Section 1803. Foundation walls and other walls in which horizontal movement is restricted at the top shall be designed for at-rest pressure. Retaining walls free to move and rotate at the top shall be permitted to be designed for active pressure. Design lateral pressure from surcharge loads shall be added to the lateral earth pressure load. Foundation walls shall be designed to support the weight of the full hydrostatic pressure of undrained backfill unless a drainage system is installed in accordance with Sections 1805.4.2 and 1805.4.3. Where a portion or the whole of the adjacent soil is below a free-water surface, computations shall be based on the weight of the soil diminished by buoyancy, plus full hydrostatic pressure.”
2.   Replace Table 1610.1 as follows:
TABLE 1610.1
LATERAL SOIL LOAD
 
LATERAL PRESSURE
DESIGN LATERAL SOIL LOADa
(pounds per square foot per foot of depth)
Active pressure
45
At rest pressure
60
 
For SI: 1 pound per square foot per foot of depth = 0.157 kPa/m, 1 foot = 304.8 mm.