P-Delta in service loads
P-Delta in service loads
(OP)
I all,
I have a question about P-delta analysis.
I am doing a explicit second-order analysis in a steel structure (LRFD), and according AISC Design Guide 28, when performing a second-order analysis, the analysis must be conducted at the ultimate load level.
OK, I have to do it for every combination (i.g. 1.2DL +1.6LL).
But my question is for foundation design, soil capacity, overturning and sliding, i need service loads no ultimate loads.
In this case what can i do to have service loads including second-order loads?
Hope you can help me
Best regards,
I have a question about P-delta analysis.
I am doing a explicit second-order analysis in a steel structure (LRFD), and according AISC Design Guide 28, when performing a second-order analysis, the analysis must be conducted at the ultimate load level.
OK, I have to do it for every combination (i.g. 1.2DL +1.6LL).
But my question is for foundation design, soil capacity, overturning and sliding, i need service loads no ultimate loads.
In this case what can i do to have service loads including second-order loads?
Hope you can help me
Best regards,






RE: P-Delta in service loads
Maine EIT, Civil/Structural.
RE: P-Delta in service loads
RE: P-Delta in service loads
Factor your load for the load case and compare it to the unfactored equivalent load case. You should then be able to figure out a combined, overall factor by dividing the factored load by the unfactored load. Run your P-delta analysis using the factored loads and then divide your final elastic + p-delta combined load by the overall factor you figured earlier.
This should result in a unfactored load case that used the factored loads for the P-delta analysis.
Maine EIT, Civil/Structural.