How do columns behave under load?

Hi, jojo6060!

It would depend on what kind of columns that you are asking about and also a number of other factors, in order to answer your question the best.

There are a lot of sites that can be found via clicking on the following link where the subject is about Structural Mechanics Behavior of Columns Under a Load

Structural Mechanics Behavior of Columns Under a Load - Google Search (http://www.google.com/search?hl=en&safe=off&q=Structural+Mechanics+Behavior+of+Columns+Under+a +Load)