Centrifugally manufactured hollow concrete-filled steel tubular columns

Building use

Office building

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Country/Region

Lithuania

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Overview

The purpose of the research conducted is to confirm or deny the assumptions made by a research of E. Morkvart in the ‘30s on the compression characteristics of steel tubes filled with concrete compressed against the perimetral pipe by means of centrifugation.

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Issue and/or innovation

The research studies the principles of centrifugated concrete, its behavior and how the reduction of the water to concrete ratio obtained thanks to the centrifugal forces imposed to concrete increases it compressive strength, load bearing capacity and Poisson’s ratio.

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Technical details

Hollow concrete-filled steel tubular elements (H-CFSTs) represent a type of composite steel-concrete elements. These elements are usually produced by spinning. During this process wet concrete mix in the steel tube is displaced and compacted by centrifugal force and the concrete core so formed achieves better physical and mechanical properties in comparison with other compaction methods. These improvements are related to concrete density, Young’s modulus, Pois-son’s ratio, compressive strength, deformability as well as to a more uniform distribution of fine and coarse aggregates and binding particles along the thickness of the hollow concrete core formed by multi-layering centrifugation process. The specimens of the testing campaign are produced using a 5mm thick tube of 219mm of diameter of S355, filled with concrete that attains a 30MPa cubic compressive strength after 28days. Quartz sand of 0,2mm and Portland cement CEM II A-L 42.5N was used. Concrete was spun in the tube with 4 different spinning velocities in one single layer and two layers, by removing the excess water produced by centrifugal force towards the center of the specimen. After 28 days of curing in controlled environmental conditions, the tubes were cut in sections of 438mm in length.

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References / Technical Papers Content

2007, Kuranovas K., Kvedaras A., K., “Centrifugally manufactured hollow concrete-filled steel tubular columns”, Journal of Civil engineering and Management, Vol XIII, No 4 297-306
https://doi.org/10.1080/13923730.2007.9636450

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References / Technical Papers

References / Technical Paper - 1

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Categories

Building, Column