Research purposes: The spiral has been developed for more than 100 years, but its form has always been relatively simple for circular columns. In this paper, compared with traditional single spiral and double spirals, the changes of the axial compression performances of the five-spiral short circular columns with the concrete strength and the volumetric stirrup ratio are studied. Compound restraint effect of the five-spiral on concrete is analyzed, and based on the theory of confined concrete, a calculation model for the axial compression bearing capacity of the five-spiral short column is proposed.
Research conclusions: (1) Compared with single spiral and double spirals, the short circular column with five-spiral has significantly larger axial compression bearing capacity and ultimate displacement. (2)The restraining effect of the five-spiral on the short circular column increases with the decrease of the concrete strength grade or the increase of the volumetric stirrup ratio. (3) The bearing capacity calculation model proposed in this paper has very small errors, which has certain reference significance for engineering practice.
Key words
five-spiral /
axial compression bearing capacity /
volumetric stirrup ratio /
Mander model
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References
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Footnotes
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