Eccentric Loading & P-Delta - Out of Plane Load?

[BadgerEngineer]

Would you consider Eccentric Loading & P-delta effects to be an out of plane load?

The loading is in the plane of the wall, however, bending is out of plane. Based on terminology alone - I would say no.

For example, if you have an interior masonry wall (no significant lateral load) with a joist bearing on one side you will have a load with an eccentricity. This eccentricity will cause out of plane bending in your wall and out of plane deflection which will also lead to a P-delta effect.

The reason I ask is because ACI 530-05 states that section 3.2.5 Wall Design for out of plane loads - applies to walls with out-of-plane loads.

This than directs you to check deflection requirements for the wall. Does this need to be checked if deflection in the wall is solely due to eccentricity & P-delta? It seems the purpose is to limit deflection and if this is the case - why wouldn't you also check the deflection caused by eccentric loads?

 

[KBVT]

I've always read the moment created by eccentric axial loads to be an 'out-of-plane' moment. The calculation is the same for an eccentric axial load and a wall loaded axially & in its weak plane. I would think deflection requirements would need to be checked in both cases.