An important aspect of the theory of concrete filled circular pipes is to determine the limiting confining coefficient at which the axial force-strain curves become ideal elastic-plastic. This article proposed a simple way for computing this limiting confining coefficient, the results are in good agreement with the test results reported by the literature, implying the correctness of the proposed method.
Tomii M.Experimental studies on concrete filled steel tubular stub columns under concentric loading[C]// Proceeding of the international Colloquium on Stability of Structures Under Static and Dynamic Loads.Washington DC,USA:1977:718-741.