This paper presents an experimental investigation on the lateral impact performance of axially loaded concrete-filled double-skin tube (CFDST) columns. These columns have desirable structural and constructional properties and have been used as columns in building, legs of off shore platforms and as bridge piers. Since they could be vulnerable to impact from passing vessels or vehicles, it is necessary to understand their behaviour under lateral impact loads. With this in mind, an experimental method employing an innovative instrumented horizontal impact testing system (HITS) was developed to apply lateral impact loads whilst the column maintained a static axial pre-loading to examine the failure mechanism and key response parameters of the column. These included the time histories of impact force, reaction forces, global lateral deflection and permanent local buckling profile. Eight full scale columns were tested for key parameters including the axial load level and impact location. Based on the test data, the failure mode, peak impact force, impact duration, peak reaction forces, reaction force duration, column maximum and residual global deflections and column local buckling length, depth and width under varying conditions are analysed and discussed. It is evident that the innovative HITS can successfully test structural columns under the combination of axial pre-loading and impact loading. The findings on the lateral impact response of the CFDST columns can serve as a benchmark reference for their future analysis and design.
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The authors would like to thank Mr. Anthony Morris and Mr. Mark Hayne for their continuous support in the experimental work. They also like to thank One Steel Mill Tube (Australia), HY-TEC concrete and Sika (Australia) for supporting this research by supplying the steel tubes, concrete and adhesive mortar, respectively.
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Aghdamy, S., Thambiratnam, D.P. & Dhanasekar, M. Experimental Investigation on Lateral Impact Response of Concrete-Filled Double-Skin Tube Columns Using Horizontal-Impact-Testing System. Exp Mech 56, 1133–1153 (2016) doi:10.1007/s11340-016-0156-z
- Experimental testing
- Lateral impact
- Concrete-filled double-skin tube (CFDST)
- Horizontal impact testing system
- Axial pre-loading