Abstract
In the past, many works to study the mechanical behaviour of concrete filled steel tubular (CFST) stub columns have been conducted. Some of the applications of these composite columns oblige to meet higher requirements of ductility and load-bearing capacity. Traditionally, circular and rectangular tubes have been employed but recently new cross-sectional shapes of these composite columns are being designed and investigated with the aim of optimizing their mechanical behaviour. In this line, concrete-filled round-ended steel tubular columns (CFRT) have appeared as an alternative. However, the number of experimental programs to characterize their mechanical response is still scarce. In order to contribute to the test results database, in this paper an experimental study of 9 concrete-filled round-ended steel tubular stub columns is presented. All the specimens were designed with the same cross-sectional round-ended shape and have the same dimensions. In this program, both normal and high-strength concrete were employed as infill. During the tests, the columns were subjected to axial compression loads but under different eccentricities. The influence of eccentricity and concrete strength on the ultimate load bearing capacity of the concrete-filled round-ended steel tubular are discussed. Besides, the combined action of both components in this type of concrete-filled tubes as well as the effect of the concrete infill are studied.
Highlights
It is well known that concrete-filled steel tubular (CFST) columns have excellent structural characteristics like high load capacity, ductility, large energy absorption capacity in case of seismic action and excellent fire resistance
Two series can be distinguished, one for those columns filled with normal strength concrete (NSC) (C30) and another for those with highstrength concrete (HSC) (C90)
The experimental results of 9 tests on concrete-filled round-ended steel tubular stub columns subjected to eccentric loads have been presented
Summary
It is well known that concrete-filled steel tubular (CFST) columns have excellent structural characteristics like high load capacity, ductility, large energy absorption capacity in case of seismic action and excellent fire resistance. These are some of the reasons that make them an interesting and competitive option for different structures like high-rise buildings, bridges, warehouses, etc. Most of the studies are focused on columns built up with circular, square or rectangular tubes These are the most studied and used cross-sectional shapes. Rounded shapes are attractive to designers and this fact has encouraged researchers to carry out some studies about elliptical sections. The influence of eccentricity and concrete strength on the ultimate load bearing capacity of the concrete-filled round-ended steel tubular are discussed
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