Method and apparatus for strengthening the concrete elements using prestressing confinement

Abstract

A technique and apparatus for retrofitting the concrete elements using external prestressing is presented. The method is more applicable in columns with rectilinear cross-section. This technique increases the strength and ductility of the reinforced concrete elements without significantly increasing the dimensions or weights of these elements, or even harming the concrete section. The technique is simple, easy to use, and does not need special hardware in rectilinear cross-sections. In addition, the technique reduces the lateral strains, internal cracking, and volume increase when adding more loads on the concrete element. Global external prestressing is provided along the whole length or the required part of the element to be strengthened through a set of elongated members using the special apparatus presented hereinafter.

Dependencies are inferred from the claim text.