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In a concrete column supporting an overhead load and having a base end resting on a surface, a process of strengthening the column to increase its ability to withstand atypical physical loading accompanying an earthquake, involving the steps of defining a work area about the surface of the column to

In a concrete column supporting an overhead load and having a base end resting on a surface, a process of strengthening the column to increase its ability to withstand atypical physical loading accompanying an earthquake, involving the steps of defining a work area about the surface of the column to which the strengthening is to be applied, the work area defined by circumferential marginal edges arranged in spaced-apart relation; overwrapping the work area with at least one layer of high-strength, stretchable fibers wherein the fibers are oriented at an angle to the vertical axis of the column; applying a coat of hardenable material, having a modulus at least as great as that of the fibers, over the layer of fibers to form a hard outer shell thereover; and, injecting a quantity of a hardenable, low-shrink liquid under the layer of fibers and over the surface of the work area in an amount sufficient to cause the fibers to undergo stretching from about ½% to about 4% of their elongation.

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In a concrete column supporting an overhead load and having a base end resting on a surface, a process of strengthening the column to increase its ability to withstand atypical physical loading accompanying an earthquake, comprising the steps of: a) defining a work area about the surface of the colu

In a concrete column supporting an overhead load and having a base end resting on a surface, a process of strengthening the column to increase its ability to withstand atypical physical loading accompanying an earthquake, comprising the steps of: a) defining a work area about the surface of the column to which said strengthening is to be applied, said work area defined by circumferential marginal edges arranged in spaced-apart relation about the column; b) overwrapping said work area with at least one layer of high-strength, stretchable fibers wherein said fibers are oriented at an angle to the vertical axis of the column; c) applying over said layer of fibers a coat of hardenable material, having a tensile elongation at least as great as the tensile elongation of said fibers and being capable of expanding and stretching with said fibers, and hardening said coat to form a hard outer shell over said work area; and, d) injecting a quantity of a hardenable, low-shrink liquid under said layer of fibers and over said surface of the concrete column within said work area in an amount sufficient to cause said fibers to undergo from about ½% to about 4% elongation.