Abstract
The article deals with the influence of steel fiber length on the load-bearing capacity of a strengthened reinforced concrete column using a layer of fiber reinforced concrete. The effect of fiber length on the compressive strength of fiber reinforced concrete is not as significant as on the tensile strength and flexural tensile strength. Fiber concrete has up to 50 to 100% higher tensile strength compared to plain concrete. This difference is due to the amount of fibers added and also to their length. For vertical elements that are stressed by a combination of axial force and bending moment, it is possible to use increased tensile strength of fiber reinforced concrete. Using the interaction diagram of the reinforced column, it is possible to determine the load-bearing capacity and then compare the load-bearing capacity increments at all points of the interaction diagram impressed with the length of the fibers.
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