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钢管混凝土是在钢管内填充混凝土组成的一种组合材料。参照 M.D.Kotsovos和 J.B.Newman提出的混凝土三向本构关系和钢管混凝土中混凝土的单向本构关系模型，推导出一种适合于钢管混凝土三维双重非线性分析的混凝土三向本构关系，并通过编制的有限元程序计算算例，验证了所推导的钢管混凝土中混凝土的三向本构关系的正确性。
Steel pipe concrete is a composite material filled with concrete in a steel pipe. According to the three-dimensional constitutive relation of concrete and the unidirectional constitutive relation model of concrete in CFST, a three-dimensional constitutive relation of concrete which is suitable for three-dimensional double-nonlinear analysis of CFST is obtained by referring to MDKotsovos and JB Newman. The finite element program calculation example is compiled to verify the correctness of the three-way constitutive relation of the concrete in the derived CFST.