Abstract
A concrete column has a significant influence on constructions because the component withstands the major weight of the whole structure. However, the ordinary concrete column has limited capacity to resist to multiaxial loadings. Since steel plate is one of the most common materials used in construction, concrete reinforced with steel plates based on prestressing reinforcement technology would be a directly applicable solution to the enhancement of mechanical property. In this study, a new reinforcement method upon concrete cylinder column used a two-way prestressed semicircular steel plate, which has already been patented. The study firstly analyzed the stress-bearing situation of the short concrete column reinforced by a two-way prestressed semicircular steel plate. The considerable substitution effect of vertical prestressing force on the concrete column was explored. The multiple restriction effects of horizontal prestressing force, semicircular steel plate, and stirrup were examined. Thereby, the calculation model was derived for the prestressed structure. Secondly, the formula was verified by experiments with close agreements. The result indicated that a unified strength theory was applicable to the theoretical calculation for short concrete column reinforced with a prestressed semicircular steel plate under axial compression, providing the foundation for analytical computation of prestressed semicircular steel plate-reinforced concrete column structures.
Highlights
Reinforcement methods for concrete column largely include a section expansion method, spiral bar constraint method, steelwrapping reinforcement method, fiber-reinforced polymer reinforcement method, composite reinforcement method, axial prestressed strut reinforcement method, steel plate reinforcement method, and prestressed steel strip reinforcement method
The section expansion method, spiral bar constraint method, steel-wrapping reinforcement method, fiber-reinforced polymer reinforcement method, and composite reinforcement method lay the emphasis on horizontal column reinforcement and enlarge the sectional area of the concrete column while improving its axial bearing capacity
The literature relevant to the circular steel tube reinforcement method focuses on the axial compression bearing capacity [1,2,3,4,5,6,7,8] and seismic performance [9,10,11]
Summary
Reinforcement methods for concrete column largely include a section expansion method, spiral bar constraint method, steelwrapping reinforcement method, fiber-reinforced polymer reinforcement method, composite reinforcement method, axial prestressed strut reinforcement method, steel plate reinforcement method, and prestressed steel strip (steel strand) reinforcement method. Concrete reinforcement using a circular steel tube can improve the bearing capacity of the concrete column as well as ductility. The literature relevant to the circular steel tube reinforcement method focuses on the axial compression bearing capacity [1,2,3,4,5,6,7,8] and seismic performance [9,10,11]. Transverse prestressing force actively constrains core concrete so that both bearing capacity and deformation performance of reinforced concrete column are improved. The test indicates that the prestressed steel plate hoop can effectively constrain deformation of the concrete column and improve compression bearing capacity, shear bearing capacity, and seismic performance of the concrete column. The calculated results obtained through the computational formula were compared with test results in [24, 25] to verify the reliability of the formulas
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