Hi
I have a question with regard to the Gross bearing capacity input. Here it is.
Let us assume that I have a footing which is critical in uplift. Let us also assume that Im using the “Gross Bearing Capacity Input” setting. If the depth of excavation is 2m then please clarify the following
The parameter “Depth of soil above footing” is “2m-footing thickness” for gravity load cases (and)
0m for the case where there is uplift. (I think this should be 0m because the bearing capacity has been increased already on account of additional soil).
Please clarify if my assumption above is correct. If it is correct, then is there a provision in staad foundation to have the soil weight act only for some load cases and not act for the remaining cases.
Regards
Sriprakash
Hi,
It is always suggested to use net bearing capacity instead of gross bearing capacity. The net bearing capacity is what you need to use directly to find out initial footing size from the bearing capacity concept. IS 6403 instructs to compute net bearing capacity for the foundation design. The effect of depth is being considered in net bearing capacity and which can directly be used for foundation design.