Abstract
The new supporting structure, internally confined hollow reinforced concrete (ICH RC), was suggested by former researchers. It maintains the material saving effect, which is the advantage of the hollow concrete structure, and it solves the brittle fracture problem of the inner wall by the inner steel pipe to make it into the 3-axis confinement state. However, until now, its design and analysis model has been limited to a circular cross-section. In this study, to expand the applicability, research and development of an ICH RC structure with a polygonal cross-section were performed. The material model was developed by defining the constraint stress in the members of the concrete and deriving a reasonable stress-strain relationship. For the column model, it was developed to predict the behavior of the polygonal ICH RC columns by analyzing the axial force-moment correlation, moment-curvature, and lateral force-displacement relationship. Each model was verified not only by comparing with the results of previous experiments but also by analyzing the results according to parameters. The maximum load and ultimate displacement values through the developed model showed the difference with the experimental results within 6% of mean error. It was verified that the proposed analytical model reasonably reflects the behavior of actual columns.
Highlights
The trend of enlargement of structures, such as skyscrapers, pier for long-span bridges, and wind turbine towers, has been growing
The inner tube failed before the failure of the transverse reinforcement in failure mode 1, and the concrete in the polygonal internally confined hollow reinforced concrete (ICH RC) column was triaxially confined until the failure of the inner tube
The polygonal ICH RC can be of a rectangular cross-section, so the confining pressure should be considered for the horizontal (x-axis) and vertical (y-axis) directions
Summary
The trend of enlargement of structures, such as skyscrapers, pier for long-span bridges, and wind turbine towers, has been growing. In the case of RC columns that can reduce the column weight and save material usage, it is possible to use the cross-section more effectively than the solid reinforced concrete column. It might exhibit low ductility behavior due to the brittle fracture inside the column. RC structure can be applied to the supporting structures of skyscrapers, super long-span bridges, and new types of wind towers, and it can contribute to safety improvement of the structure. RC structure has been extensively researched and applied to a wind tower, but ICH RC columns having polygonal cross-sections have not been researched [13]. RC structure when it applies to supporting structures such as super long-span bridges, high-rise buildings, and wave dissipating blocks
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