Behavior of Square Concrete-Filled Tubular Columns under Eccentric Compression with Double Curvature Deflection

Abstract eng:
Objective of this paper is to present experimental information about the behavior of square CFT columns subjected to eccentric compression with double curvature deformation, to investigate validity of the current design formula for slender CFT columns, meanwhile to study its applicability to the middle-length columns. Forty-three square CFT columns were fabricated and tested. The experimental variables among the tests are, 1) the buckling length to depth ratio of the column, 2) the concrete strength, 3) the moment gradient which deforms the column into double curvature, and 4) the eccentricity of the axial load. Experimental results have indicated that the flexural strength of slender square CFT columns increases with the concrete strength and the moment gradient. Comparison between the test results and the theoretical ones predicted by the current design code has shown that for the slender square CFT columns with the buckling length to depth ratio of 20, the current design formula could satisfactorily well predict the flexural strength in spite of the degree of moment gradient. For the middle-length square CFT columns with the buckling length to depth ratio of 10, however, the current design formula overestimates the flexural strength when the column was under eccentric compression without moment gradient, i.e. under pure bending. On the other hand, for the middle-length columns under eccentric compression with moment gradient, the current design formula could be applied to evaluate their flexural strength with satisfactory accuracy.

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