In this study, the risk matrix method was applied to reduce the number of post-tension survey in maintenance. The risk matrix weights and evaluation indexes were studied according to the maintenance system.

• 지승구(한국시설안전공단 교량터널안전실/부장, 공학박사) | Ji, Seung Gu
• 김진수(한국시설안전공단 교량터널안전실) | Kim, Jin Su
• 김형조(유니콘스(주) 기업부설연구소 과장) | Kim, Hyung Jo 교신저자