Lateral Sliding

[Ararat73]

UBC Table 18-I-A has a value of 130 psf for lateral sliding resistance for soil #5. Footnote 6 talks about a contact area that this value should be multiplied by. Can anyone tell me what does UBC mean by the contact area?

 

[TDAA]

They are discussing the lateral sliding of a footing on soil. The contact area is the size of the footing(s). So a 6' x6' footing is 36 SF.

 

[Ararat73]

Thanks TDAA. Does that also apply to mat foundations when checking the global sliding?

 

[BigH]

Ararat73 - instead of trying to learn how to design this from the UBC, why not pick up a good geotechnical foundation book and read up on lateral sliding of foundations (base of retaining walls, etc) - or look in NAVFAC 7.2. This situation is typically discussed in any text (Bowles, for example).