| Title |
Physical Habitat Simulation Considering Stream Morphology Change due to Flood |
| Authors |
이성진(Lee, Sungjin) ; 김승기(Kim, Seung Ki) ; 최성욱(Choi, Sung-Uk) |
| DOI |
https://doi.org/10.12652/Ksce.2014.34.3.0805 |
| Keywords |
물리 서식처 모의;서식처 적합도 지수;하상변동;CCHE2D 모형;가중가용면적 Physical habitat simulation;Habitat suitability index;Morphological change;CCHE2D model;Weighted usable area |
| Abstract |
Because cable-supported bridges have long spans and large members, their movements and geometrical changes by temperatures tend to be bigger than those of small or medium-sized bridges. Therefore, it is important for maintenance engineers to monitor and assess the effect of temperature on the cable-supported bridges. To evaluate how much the superstructure expands or contracts when subjected to changes in temperature is the first step for the maintenance. Thermal movements of a cable-stayed bridge in service are evaluated by using long-term temperatures and displacements data. Displacements data are obtained from extensometers and newly installed GNSS (Global Navigation Satellite System) receivers on the bridge. Based on the statistical data such as air temperatures, each sensor's temperatures, average temperatures and effective temperatures, correlation analysis between temperatures and displacements has been performed. Average temperatures or effective temperatures are most suitable for the evaluation of thermal movements. From linear regression analysis between effective temperatures and displacements, the variation rate's of displacement to temperature have been calculated. From additional regression analysis between expansion length's and variation rate's of displacement to temperature, the thermal expansion coefficient and neutral point have been estimated. Comparing these parameters with theoretical and analytical results, a practical procedure for evaluating the real thermal behaviors of the cable-supported bridges is proposed. |