In concrete fiHed tubular columns ， the mechanism of stress transsmision betweerl the steel tube and concrete has not been clarified ， Therefore it is common to attach mechanlcal stoppers to the i 冂side of the tube ， Firstly ， we investigated the bearing strength of concrete and backing rings for tubular columns and approximated the ultimate strength ． Secondly ， we es セ imated the yield strength( 1Py) ， displacemen セ( 1δ｝and bearing spring ( K｝ on the surface of one ring whih was weldedinside the column ， Finally ， we could estimate the yield strength 〔 2Py ｝ and displacement ｛ 2δ ｝ by using ｛ 1Py)and ( K｝incase of two rings ．

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