Experimental behavior of concrete filled double steel tubular (CFDST) members under low velocity drop weight impact |
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| Affiliation: | 1. Institute for Infrastructure Engineering, University of Western Sydney, Penrith, NSW 2751, Australia;2. Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, University of New South Wales, NSW 2052, Australia;3. School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW 2522, Australia;4. Department of Civil & Environmental Engineering, National University of Singapore, BLK E1A, #07-03, One Engineering Drive 2, Singapore 117576, Singapore;1. School of Civil Engineering and Built Environment, Queensland University of Technology, Brisbane, Australia;2. Hatch Ltd., Vancouver, Canada |
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| Abstract: | Thirty-one tests under low velocity drop weight impact were carried out to examine the residual failure modes and the time history of the impact forces, global deformations and strains of concrete filled double steel tubular (CFDST) members in this paper. The parameters varied in the testing program include the column type (straight and tapered), the boundary conditions (simply supported and fixed), the axial load level and the impact energy. The results showed that all CFDST members behaved in a ductile manner and the residual deformation consisted of local deformation at the impact section, as well as the overall bending deformation. Compared to hollow double steel tubes, the CFDST members under the same applied impact energy demonstrate superior impact behavior in terms of higher energy absorbed, smaller global deformation and local deformation due to the interaction of the sandwich concrete and double skin steel tubes. The influence of key parameters on the dynamic resistance ability of CFDST is discussed. |
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| Keywords: | Concrete filled double steel tube (CFDST) Steel hollow section Concrete Lateral impact Tapered column Energy absorption Failure mode |
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