Abstract
A method is proposed to analyze confining effect on filled-in concrete square steel tube utilizing three basic assumptions: 1)Concrete and steel are rigid-plastic. 2)Modified Willam-Warnke's theory of failure is applicable to concrete. 3)Stress field consists of two kind of arch compression modes which satisfy the equilibrium condition. The rise of uniaxial strength is almost proportional to the square root of yield moment. According to this result, a formula is proposed to calculate the uniaxial strength of filled-in concrete square steel tube. The proposed formula agrees with existing experimental results. The prevailing experimental formulas tend to underestimate the uniaxial strength when the thickness or yield strength of steel tube is low.
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