Problem Description

The self weight of the footing and the pedestal weight is not being factored when carrying out sliding check for isolated footings. The issue has only been observed for sliding check for isolated footings when the self weight factor is not equal 1.

Steps to Reproduce

Here is a summary of the findings:

Restoring force = downward force* coefficient of friction

Downward Force = Footing Wt. + Pedestal Wt. + Soil Wt. + Axial Force in Crit. LC

When one specifies a self weight factor as shown in the picture below, the selfweight factor should be applied as follows: 

Downward Force = 0.6*Footing Wt. + 0.6*Pedestal Wt. + 0.6*Soil Wt. + Axial Force in Crit. LC

However, the software is currently applying the 0.6 factor only to the Soil Wt. , as explained next

Downward Force = Footing Wt. + Pedestal Wt. + 0.6*Soil Wt. + Axial Force in Crit. LC

The selfweight factor should be applied to the footing weight and pedestal weight as well.

Workaround

None

Solution

Will be addressed in the next release STAAD Foundation Advanced.

See Also