A constitutive relationship of concrete core confined by square steel tube is put forward based on the analysis on interaction mechanics within components of square CFT and the conception of equivalent lateral compressive stress. The constitutive relationship takes similar form of the constitutive model of confined concrete while its parameters such as coefficient of ultimate strain, effectively lateral compressive stress, and transverse stress of steel tube and so on are modified to fit square CFT with experimental results. Finally, the experimental specimens are calculated with the proposed constitutive relationship and the theoretical calculating load-strain curves are shown in good agreement with the experimental ones. The proposed constitutive relationship can evaluate ultimate strength and deformation of square CFT effectively.
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孙刚 康香萍 蔡健. 方形钢管混凝土的本构关系[J]. 科学技术与工程, 2007, (23): 6090-6095. SUN Gang, KANG Xiang-pmg, CAI Jian. Constitutive Relationship of Square CFT[J]. Science Technology and Engineering,2007,(23):6090-6095.