Rebar used in concrete

Abstract

A non-circular rebar used in concrete includes a square rebar, a rectangular rebar, an elliptical rebar, a trapezium rebar, a triangular rebar, and a rebar with round edges and corners. The square, rectangular, elliptical, trapezium, and triangular rebars and the rebar with round edges and corners substitute the conventional circular rebar, so that the rebars can be tied easily to save the space occupied. Since the distance of the resultant force of the tensile stresses of the rebar from the boundary of the concrete becomes smaller or the concrete protecting layer becomes thicker, the change of the shape increases the bonding between the rebar and concrete, and the safety of construction is improved. The non-circular rebar includes a smooth rebar and a ribbed rebar with a non-circular main cross-section.

1 . A non-circular rebar used in concrete, comprising
 the non-circular rebar being selected from the group consisting of a square rebar, a rectangular rebar, an elliptical rebar, a trapezium rebar, a triangular rebar, and a rebar with round edges and corners;   the non-circular rebar being a smooth rebar or a ribbed rebar with a non-circular main cross-section;   the non-circular rebar comprising steel and a fiber reinforced composite material;   the non-circular rebar with a non-circular main cross-section substituting a conventional rebar with a circular main cross-section;   the non-circular rebar having certain functions and bearing forces in certain directions in a concrete structure; and   the non-circular rebar having an enhanced overall bearing capacity and ductility.   
     
     
         2 . The non-circular rebar used in concrete according to  claim 1 , wherein the fiber reinforced composite material is FRP.