Abstract
ABSTRACTThe results obtained from an experimental campaign on concrete‐filled double‐skin steel columns subjected to eccentric loads are presented in this paper. The program includes columns with equivalent cross‐sectional area but with different shape combinations of the inner and outer steel tubes: circular‐circular, circular‐rectangular and square‐circular tubes. The experiments have been designed considering columns with steel tubes of different dimensions and concrete infill with different strength: normal (NSC) and high strength concrete (HSC). Besides, all the tubes employed for the configuration of the columns are thin‐walled steel tubes.The effects of materials and geometry are studied in order to find the best configuration attending to ultimate capacity, strength index and concrete contribution ratio. Results show that as expected, the use of HSC results in an increment in the load bearing capacity and in the concrete contribution ratio of the columns, which decreases with eccentricity. Regarding the shape effect, the configuration with circular‐circular tubes proved to be the most efficient, contrarily to the rectangular‐circular double skin section.
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