Abstract
This paper describes the compressive deformation behavior of tubes with outer constraints by thin tubes. Pure compression is applied only on the inner main tube and this tube is unilaterally constrained by outer stiffening tubes. As a parameter, we consider the thickness of stiffening tubes. The results obtained from stub column test and finite element analysis are as follows. The outer stiffening effect is more effective as the thickness of the stiffening tube is thicker. However, in the case of thinner outer tube, the outer stiffening effect becomes to be effective by using higher yield strength of the outer tube.
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