huangyhg

eccentric loading & p-delta - out of plane load?
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?


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.

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