Abstract
A novel type of concrete filled double-skin steel tubular (CFDST) with external welded corrugated steel tube was proposed, and the flexural behavior of this CFDST type was assessed by testing of 8 specimens. Test parameters include the hollow ratio, the thickness of the inner tube, and the strength of the concrete. Experimental results indicate that the specimens with external corrugated steel tubes failed in a ductile manner, and achieved somewhat higher flexural capacity and significantly improved ductility compared with the members confined by external flat steel tubes. The strength and thickness of the external corrugated steel tubes and the hollow ratios had a considerable effect on the flexural capacity, and the desirable geometrical parameters of the corrugation were further obtained by the finite element methods. Moreover, the performance of four existing design models for the flexural capacity of CFDST was evaluated based on the test results available in the literature and in this study, and a new analytical model for CFDST with external welded corrugated steel tube was proposed. The proposed analytical model provided excellent prediction for the flexural capacity of the tested specimens..
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