It has become a very important issue to establish a rational reinforcement method for transmission towers, since the increase of assumed loads resulting from revision of design standards. However, some methods have been established for replacing and reinforcing brace members, it’s very difficult to replace the main post members.

In this study, we propose a reinforcement method in which reinforcement members are added to the existing main post angle members, and confirm the effectiveness of the reinforcement and its range of application by member compression tests.