There are more than 9,300 bridges on the highway, of which about 34%(3,150) are PSCI bridges. The safety of these bridges is directly influenced by the tensile strength of the internal tendons(strand) and the strength of the concrete compared to the reinforcing bars from the design viewpoint. Therefore, in this paper, for the maintenance plan considering the damage of the internal tendons, the internal tendon cutting and truck loading test was conducted and deflection and appearance status change was analyzed. As a result of the test, deflection increased and flexural cracks occurred on center of the girder. And longitudinal direction cracks followed tendon placement occurred on a bottom flange.

Abstract
 1. 서 론
 2. 실험계획
 3. 실험결과
 4. 결 론

• 최진웅(한국도로공사 도로교통연구원 구조물연구실) | Choi Jinwoong
• 박창호(한국도로공사 도로교통연구원 구조물연구실) | Park Chang Ho
• 김기환(한국도로공사 도로교통연구원 구조물연구실) | Kim Ki Hwan