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seismic pressures on basement walls for single families - does the code require?

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Title: seismic pressures on basement walls for single families - does the code require?

Anyone:

I have not checked the archives on this one.  The Anchorage Administrative Code does not require soils reports for single family and duplex occupancies when there is a subdivision soils report prepared by a licensed civil engineer.  2000 IBC 1802.2.7 indicates that soils investigations need to include a determination of lateral pressures on basement and retaining walls due to earthquake motions.   2000 IBC 1610.1 says basement walls  shall be designed per 2000 IBC Table 1610.1 unless otherwise specified in a soil investigation report.  Locally, there a soils investigation is typically not done for individual detached single family and duplex occupancies and the subdivision soils reports have not traditionally addressed earthquake pressures on basement walls.

2003 IBC 1622.1.2 amends ASCE 7-02 Section 9.14.7.2.1 which refers to ASCE 7-02 Section 9.7.5.1 "Investigation".  2003 IBC 9.7.5 exempts detached 1 and 2 family dwellings not over two stories from 9.7.5.1 which requires the determination of lateral pressures on basement and retaining walls due to seismic forces.

Should residential basement walls and retaining walls be designed for seismic forces?  Is it the intent of the code to design residential basement walls for seismic forces?  Are there Building Departments requiring residential [detached 1 and 2 family dwelling] basement walls to be designed for seismic forces?  This has not been standard practice in Anchorage.

Thanks.

Scott M. Haan P.E.
Chief of Building Inspections

Municipality of Anchorage
Development Services  Department
Mission Statement:  Guide safe construction and responsible development for the community.