Plastic hinge structure of RC column structure and method of repairing plastic hinge portion of RC column structure

摘要

To provide a plastic hinge structure of an RC columnar structure and a method for repairing a plastic hinge part of the RC columnar structure capable of reducing the residual strain at the plastic hinge part while preventing brittle failure such as collapse and also immediately being repaired even at the time of severe earthquake.SOLUTION: A plastic hinge structure 1 of an RC columnar structure (RC pier 10) having a plastic hinge part 2 which is installed at the top and/or bottom of an RC columnar structure that receives an axial force such as an RC piers 10 and an RC columns, and bending stress acting on the RC columnar structure (RC pier 10) yields the axial reinforcing bars (axial reinforcement 4) to absorb seismic energy, the plastic hinge structure comprising a pipe body (steel pipe 6) embedded along the central axis in the RC columnar structure (RC pier 10) and extended vertically along the axial direction from the plastic hinge part 2 in order to prevent damage to the core concrete that supports the axial force, and a plurality of pairs of mechanical joints 5 that are provided near the upper and lower ends of the plastic hinge part 2 and connects the axial reinforcing bars (axial reinforcement 4) that bends and yields.SELECTED DRAWING: Figure 2