Concrete reinforcing fiber
AssigneeThe University of British Columbia
InventorsNemkumar Banthia, Hugo S. Armelin
Life of this patent
Estimating the term…
Abstract
An improved reinforcing fiber for concrete is formed with two types of anchors positioned adjacent to each axial end of the fiber. A drag anchor which frictionally resist being pulled from the concrete without fiber breakage and a dead anchor between the drag anchor and adjacent axial end of the fiber, the dead end engages the concrete to develop stresses at a weakened point in the fiber formed between the drag anchor and its adjacent dead anchor to break the fiber or deform the dead anchor before maximum tensile strength of the fiber is reached so that the dead anchor functions to maximize the load carrying capacity while at the same time protecting against fiber rupture and the drag anchor continues to function after release of the weak point of the fiber.
Claims20
A concrete reinforcing fiber comprising a fiber having a maximum load carrying capability, means defining a drag anchor adjacent to but spaced from each axial end of said fiber, means forming a dead anchor between each said means forming said drag anchor and its adjacent axial end of said fiber and a dead anchor release which reduces load carried by said dead anchor when an applied load less than said maximum load carrying capability is applied to said fiber and which applied load develops a stress in said dead anchor release that exceeds a preselected stress.
Dependencies are inferred from the claim text.