Abstract
The purpose of this research is to study the effect of both transverse impact, and ratio of outer diameter to thickness of outer steel tube (D/t), on the residual axial bearing capacity of concrete-filled circular steel tubular columns (CFCSTCs). A total of sixteen samples, including four samples left untreated for comparison, are experimentally studied to investigate the effect of both drop-hammer transverse impact height (H), and D/t ratio, on the residual axial bearing capacity of CFCSTCs. The failure mode, load-displacement curves, load-strain curves, and residual axial bearing capacity of those samples are extensively investigated. A finite element analysis (FEA) model is established to predict the effect of D/t ratio on the residual axial bearing capacity of CFCSTCs. The results indicate that the H and the D/t ratio have noticeable effects on the axial compression performance of CFCSTCs. Failure mode of samples is commonly local buckling. In addition, maximum reduction of the axial bearing capacity of columns reaches about 35% compared with that of untreated columns. The results also show that the bearing capacity of the column increases with a decreasing D/t ratio of the same diameter (D).
Highlights
Concrete Filled Tube (CFT) structures are widely used in engineering due to their excellent structural and constructional performance [1,2]; this is especially the case for typical forms of Concrete Filled Steel Tube (CFST) structures [3,4,5,6,7,8,9,10]
Compared with concrete filled FilledFiber Reinforced Polymer (FRP) Tubes (CFFT), CFSTs are preferred when involving transverse impacts, because steel has much better toughness than FRP when subjected to direct impacts
It can be seen thatshown ininthe impact test, displacement the mid-span (Δo)1.increases with an increase the drop hammer height (H). the Photographs theofshown samples after transverse impact tests are in transverse
Summary
Concrete Filled Tube (CFT) structures are widely used in engineering due to their excellent structural and constructional performance [1,2]; this is especially the case for typical forms of Concrete Filled Steel Tube (CFST) structures [3,4,5,6,7,8,9,10]. Attention has been paid to Concrete Filled. Fiber Reinforced Polymer (FRP) Tubes, in view of their anti-corrosion properties, which can be better adapted to corrosive environments than CFST [11,12,13,14,15,16]. Compared with concrete filled FRP Tubes (CFFT), CFSTs are preferred when involving transverse impacts, because steel has much better toughness than FRP when subjected to direct impacts. Throughout the whole life cycle, structures, including the CFTs, may be subjected to transverse impacts from accidental or deliberate events.
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