엑스트라도즈교 케이블 장력 평가방법 개선 연구

초록

Estimating the exact tension force of cables is very important to the construction and maintenance of the cable bridges. The cable tension changes continually from the first installation to the final construction stage. Moreover, in service status, this changes con- tinuously as the vehicle loads change. Recently, many extradosed bridges are constructed and these bridges have the heavy and thick cables. But the existing formulas do not give the reliable estimations for these bridges because these formulas do not consider the tension force induced by self-weight (gravity effect). In this study, the gravity effect on the extradosed bridge cables is investigated and an improved estimation method considering the gravity effect is proposed. The relationship among the gravity effect, the natural frequency and the slenderness ratio is also clearly explained. The field test results show that the new method has the acceptable reliability compared with the existing methods for the extradosed bridge cables.

키워드