A New Method for Reinforcing Concrete Rectangular Section Columns

This paper presents a new method for the reinforcement of a rectangular section concrete column by bidirectional prestressed angle steel plates. The rectangular section column is divided into an upper reinforcement section, an axial prestressed elevation section and a lower reinforcement section. Four angle steel plates are installed in the upper and lower reinforcement sections, and the concrete columns are reinforced with circumferential prestressing. In the axial prestressing jacking section, axial prestressing angle steel plates mounted on the upper and lower reinforcing sections are axially prestressed by axial prestressing jacking bolts. A preliminary experimental analysis shows that the load capacity of the concrete column after reinforcement is 2-5 times that of the original concrete column. The implementation of the new method does not affect the use of the concrete column and does not damage its structure, and the pre-stress can be adjusted to ensure that the original structure and the reinforcement structure layer are stressed synchronously. The failure mode of the concrete in the column changes from brittle failure to plastic failure, and the stiffness, ductility and seismic resistance of the column are obviously improved after the reinforcement.

Keywords: Two-way prestressing; Angle steel plate; Reinforcement; Concrete rectangular section column; New method