This study evaluates thermal movements of an existing bridge using digital image processing technologies. Digital images are acquired from smart phones. Thermal movements which extracted from bridge bearings' images are compared to the results of conventional displacement transducers. It is concluded that the image-based process for measuring thermal movements of bridges is accurate, practical and cost-effective.

• 박종칠(한국도로공사 도로교통연구원, 공학박사) | Park, Jong-Chil 교신저자
• 조준상(한국도로공사 도로교통연구원, 공학박사) | Cho, Jun-Sang
• 길흥배(한국도로공사 도로교통연구원, 공학박사) | Gil, Heung-Bae
• 신재인(한국도로공사 서해대교관리소, 공학박사) | Shin, Jae-In