ACI 10.11.1- Lateral Analysis
ACI 10.11.1- Lateral Analysis
(OP)
I wanted to make sure I understand this correctly:
For a lateral deflection analysis use service loads; columns/walls Ig=1; beams Ig=0.5. (ACI 10.11.1 commentary)
For a frame analysis/design use factored loads; columns/walls Ig=0.7; beams Ig=0.35.If wall cracks with Ig=0.7 rerun with Ig=0.35. (ACI 10.11.1 code)
For a second-order analysis use factored loads with service deflections; columns/walls Ig=0.7; beams Ig=0.35.
(ACI 10.11.1 commentary)
Any clarification is appreciated.
For a lateral deflection analysis use service loads; columns/walls Ig=1; beams Ig=0.5. (ACI 10.11.1 commentary)
For a frame analysis/design use factored loads; columns/walls Ig=0.7; beams Ig=0.35.If wall cracks with Ig=0.7 rerun with Ig=0.35. (ACI 10.11.1 code)
For a second-order analysis use factored loads with service deflections; columns/walls Ig=0.7; beams Ig=0.35.
(ACI 10.11.1 commentary)
Any clarification is appreciated.





RE: ACI 10.11.1- Lateral Analysis
As for the third point the loads used in a second order analysis should be in line with the reason for that analysis being performed. For instance a second order analysis for earthquake loads is generally an ultimate type analysis for strength design and factored loads and crack factors should be used. A second order analysis to check say wind deflections (which in my opinion is rarely warranted) should be based on service loads and crack factors.