It has become a important issue to establish a rational reinforcement method for transmission towers, since the increase of assumed loads resulting from revision of design standards. The authors have conducted buckling tests and FEM analyses of reinforcement and proposed a buckling strength equation, but the performance for different-size reinforcement was not clear. In this study, the buckling strength equation for different size reinforcement is constructed by considering the end-bending moment ratio in the buckling strength equation for same size reinforcement. Finally, the results are compared with the FEM analysis results to confirm the usefulness of buckling strength equation.
