To monitor static and dynamic responses of bridges, an image-based monitoring system using networking Pan-Tilt-Zoom IP (Internet Protocol) cameras has been developed. Verification testing is carried out during the human-excited vibration test of the stay cables in a cable-stayed bridge. As well as identifying the natural frequencies of the stay cable, the reasonable damping ratios are successfully extracted from the acquired images.

• 박종칠(한국도로공사 도로교통연구원 책임연구원, 공학박사) | Park Jong Chil 교신저자
• 조준상(한국도로공사 도로교통연구원 책임연구원, 공학박사) | Cho Jun Sang
• 길흥배(한국도로공사 서해대교안전센터 수석연구원, 공학박사) | Gil Heung Bae
• 서정욱(한국도로공사 서해대교안전센터 과장, 공학석사) | Seo Jeong Wook