PURPOSE: A reinforcing method for flexural behavior of a reinforced concrete beam reinforced by external unbounded tendons is provided to secure the safety of a structure by preventing the momentary lowering of internal force of the existing structure. CONSTITUTION: The reinforcing method for flexural behavior of a reinforced concrete beam reinforced by external unbounded tendons comprises the steps of: installing two rope supports(15) on a quarter spot from an end of a concrete beam, and fixing a support bar to fix a fiber rope(11) on both upper ends of the beam; installing a fiber rope tendon for fixing both ends of the fiber rope tendon which passes through the rope supports(15) to the support bar; installing a support(17) between an U-shaped ring(12) of a tie bar(13) and a concrete beam; applying primary tension by fastening a turn buckle(14) continuously; after incurring relaxation loss on the fiber rope tendon, applying secondary tension.
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