when leaning column is necessary?

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ToBeLignos
Posts: 18
Joined: Wed May 15, 2013 10:14 pm

when leaning column is necessary?

Post by ToBeLignos »

Hi everybody!

when it's necessary to consider P-delta effects by using a leaning column?

if the frame is a 2d peripheral frame withdrawn from a 3d structure, is it necessary to define leaning columns?

Does "Being a peripheral or middle frame" make any difference for considering or not considering leaning columns?
ToBeLignos
Posts: 18
Joined: Wed May 15, 2013 10:14 pm

Re: when leaning column is necessary?

Post by ToBeLignos »

I have heard that if the frame is peripheral then leaning columns should be considered. is this true? why?
vesna
Posts: 3033
Joined: Tue May 23, 2006 11:23 am
Location: UC Berkeley

Re: when leaning column is necessary?

Post by vesna »

Leaning column can be added to the 2D model of a frame to capture the effect that the gravity system has on lateral-load resisting frame. It does not matter if the frame is peripheral or middle.
fmk
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Re: when leaning column is necessary?

Post by fmk »

you need to consider a leaning column if loads carried by gravity columns (those gravity loads not carried directly by frame) are significant. if a peripheral frame, each frame is only going to take half of the rest of the loads not added to the frame directcly.

for small buildings this is typically a waste of time as load is not big enough to have any effect.
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