Hybrid double skin tubular columns (DSTCs) are a composite members that consist of outer FRP tube and inner steel tube and concrete filled in between. These three materials combination in one element have several advantages do not found in common columns. The total 12 circular DSTCs were poured and tested under axial load. Every specimen is average of a pair of samples of the variables, diameter and thickness of steel tube, to investigate effect of inner steel tube void ratio on compression behavior of hybrid DSTC. The void ratio was defined as a ratio between the two inner steel and outer FRP tube diameter. The test results show that the stress-strain behavior of concrete material in the hybrid DSTCs has a better confined by two tubes. While the DSTC with small diameter has similar behavior to concrete filled FRP tube (CFFT). Thickness of inner steel tube is slightly effect on concrete stress inside DSTC.
Hybrid double skin tubular members (DSTMs) are composite section of three material FRP tube outside, steel tube inside and concrete sandwiches in between. The current study investigated the behavior of fourteen circular DSTCs under axial load. Every specimen is average of a pair of samples, the key parameters are the layers of outer carbon FRP tube, the compressive strength of concrete and the types of columns include (DSTC) and concrete filled FRP tube (CFFT). The test results show that the concrete has effected constrained between two tubes, that's leads to increases strength and ductility of column, the most effective parameters has the number of layers of outer FRP tube the stress-strain relationship shows high ductile behavior of under compression test and the CFFT is superior in ultimate load compared with DSTC.
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