There are some questions about drilled piers for staad foundation.The model of single pier capacity use drilled/driven pier foundation in plant foundation mode. The questiones refer to the followings:
1.Does the procedure chose the API code methods in drilled/dricen pier design? And is there other method for calculation?
2.There is one mode in plant foundation model about single pier capacity calculation. Some questions refer to the followings:
a).In the layer type,there is many soil layers. Is there only three layers about API code[soft clay（API），sand（API）,sand（API Extend）]? What are the calculation methods for other soil layers?
b).In the soil properties input, is there any other empirical value Epsilon 50 and J except the details about advanced help file?
3.Some questions in calculation sheet about single pier capacity calculation.
a).There are many P-Y Curves,where does the code rule come from about P-Y Curve?
b). In Depth-Capacity Table,the skin resistance is zero from 39ft to 52ft. Why is the skin resistance discontinuous?Why is the skin resistance showing zero at the top of pier?
c).What is the code rule of the critical depth for drilled pier?
4. Anthoer mode for pile cap choses General Foundation Mode. Does the pile group effect be considered in the procedure?