Natural frequency changes of an in-service concrete bridge have been monitored to analyze the dynamic characteristic according to temperature and embedded depth changes. 7 acceleration sensors are attached to the bridge, and 11 time impact experiments have been done using the impact hammer. The natural frequency has a trend to drop as the surface temperature of the body goes up. And it also has a trend to decrease as the embedded depth of the bridge foundation increases.

• 박병철(국립재난안전연구원 시설연구관, 공학박사) | Park, Byung-cheol 교신저자
• 진영지(국립재난안전연구원 시설연구사, 공학박사) | Jin, Young-ji
• 임기환(국립재난안전연구원 연구원) | Lim, Kiwhan
• 김진선(국립재난안전연구원 선임연구원) | Kim, Jin-Seon
• 장성희(국립재난안전연구원 시설연구사, 토목구조기술사) | Chang, Sunghee 교신저자