I would like to clarify your statement "Do not check either the PDELTA KG or the Small delta.Simply use PDELTA analysis with 15 iterations ( PDELTA 15 ANALYSIS ) and it would account for both large and small delta.". In the STAAD Help Page, it is stated there, "The default procedure of option 1 is based on “P-small & large Delta” effects.(sometimes referred to as P-δ & P-Δ). Enter the LargeDelta parameter to only include the “PlargeDelta” effects (P-Δ only). SmallDelta is recommended.". This now confused me, which of these two statements is what the STAAD is performing if I want to get the effects of both small and large pdelta.
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