This paper presents a theoretical and
experimental study on lateral compression of square and rectangular metal
columns. Some theoretical relations are derived to predict the absorbed energy,
the specific absorbed energy and the instantaneous lateral load during the
lateral compression. Analytical relations are obtained in two stages: elastic
and plastic parts. In the plastic zone, the total absorbed energy by the column
is calculated, based on the energy method. Then, an analytical equation is
derived to predict the instantaneous lateral load. In the elastic part, the
instantaneous load is obtained by linear behavior assumption. To verify the
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