This study investigated the variation of the temperature distribution in the steel box girder of a cable-stayed bridge during construction. Measured data were used to study the basic thermal characteristics because the thermal behavior of these bridges during construction is particularly difficult to predict and not well-known. In addition, a simple numerical approach was carried out to predict approximately the variation of the temperature distribution in a steel box girder. The temperature variation of the top flange showed a steep change, while the temperature variation of the bottom flange exhibited a smooth curve throughout the day because of the relative low amount of solar energy and encased internal air. At night, the bottom flange showed a higher temperature than the top flange and ambient temperature. In the top flange, the temperature decreased as the distance from the center increased, while the temperature in the bottom flange increased with the distance from the center. The time to reach the peak temperature at each location varied without correlation to the time of peak solar radiation because of the effect of the encased air. When compared with the measured data, the analysis results closely matched the temperature variations for different seasons in the center of the top flange, where the largest peak temperature and variation were observed. Thus, the adopted simple numerical approach can approximate the temperature variation of a steel box girder during construction in the planning and design phases.
Bibliographical noteFunding Information:
This study has been supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) grant funded by the Ministry of Land, Infrastructure and Transport of the Korean government ( 14CTAP-C078811-01 ). In addition, this study has been supported in part by Yonsei University , Creative Human Resources Center for Resilient Infrastructure , a Brain Korea 21 Plus program in Korea. The authors gratefully acknowledge the contribution of Dr. Hiroshi Tanaka, who provided advice on the data measurements, and Samsung C&T which provided the measured temperature data.
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering
- Building and Construction
- Mechanics of Materials
- Metals and Alloys