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조효남(Cho Hyo-Nam),이성칠(Yi Sungchil),오달수(Oh Dal-Soo),최윤석(Choi Yoon-Suk) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This paper presents a methodology for the determination of criteria for managing cable tension force in cable-stayed bridges using acceleration data acquired by monitoring system. There are many long span bridges installed with monitoring system in Korea. The monitoring systems are installed to diagnose abnormal behavior or damages in bridges and to warn these to bridge management agency. In cable-stayed bridges, the cable tension force could be an important indicator of abnormal behavior because of the geometric configuration of the cable-stayed bridge. If the criteria for managing cable tension force is set too high or too low, then the monitoring system could not properly warn the abnormal behavior of a bridge. Generally, the management value is set by empirical or engineering judgment, but in this paper, a new methodology for the determination of rational criteria for managing cable tension force is proposed based on the probability distribution model for tension force and reliability analysis. The proposed methodology is applied to a real concrete cable-stayed bridge to demonstrate its applicability.
조효남 ( Cho Hyo-nam ),이성칠 ( Yi Sungchil ),오달수 ( Oh Dal-soo ),최윤석 ( Choi Yoon-suk ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.1
This paper presents a methodology for the determination of criteria for managing cable tension force in cable-stayed bridges using acceleration data acquired by monitoring system. There are many long span bridges installed with monitoring system in Korea. The monitoring systems are installed to diagnose abnormal behavior or damages in bridges and to warn these to bridge management agency. In cable-stayed bridges, the cable tension force could be an important indicator of abnormal behavior because of the geometric configuration of the cable-stayed bridge. If the criteria for managing cable tension force is set too high or too low, then the monitoring system could not properly warn the abnormal behavior of a bridge. Generally, the management value is set by empirical or engineering judgment, but in this paper, a new methodology for the determination of rational criteria for managing cable tension force is proposed based on the probability distribution model for tension force and reliability analysis. The proposed methodology is applied to a real concrete cable-stayed bridge to demonstrate its applicability.
현이론을 이용한 사장교의 케이블 종류별 장력추정 결과 비교연구
정현준 ( Jung Hyunjun ),김규선 ( Kim Gyu Seon ),이덕근 ( Lee Deok Keun ),오달수 ( Oh Dal Soo ),이상철 ( Lee Sang Cheol ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
The management of the cable tension of cable-stayed bridges is one of the most important jobs for long-term maintenance works. The cable tension is usually estimated by the string vibration theory with the natural frequency extracted from the field monitoring acceleration data of the cables. The estimation of the cable tensions is often affected with the bending stiffness, sag, effective length of cables. Also, in the case of the multi-strand stay cable (MS type), it should be considered that the empty space between the strand bundle and the protecting HDPE duct can affect the acceleration of cables when the accelerometer is installed just on the HDPE duct. From this reason, the exact acceleration data of cables could not be obtained. Therefore, the cable tension estimated from the acceleration of the HDPE duct may contains large errors. In this study, the calculated cable tension is compared according to cable types as a preliminary study on the reliability analysis of the method for estimation cable tension.
정현준 ( Jung Hyunjun ),김규선 ( Kim Gyu Seon ),이덕근 ( Lee Deok Keun ),오달수 ( Oh Dal Soo ),이상철 ( Lee Sang Cheol ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
This paper provides a carbonation prediction model, based on the Fick's 2nd law of diffusion. The model considers important parameters such as the chemical composition of cement and atmospheric CO2 concentration, W/C ratio, the degree of hydration. In this study, carbonation prediction model is developed by using a bayesian approach. The proposed model ie very useful in designing concrete structures and can predict the remaining service life of existing concrete structures which have been monitored.
공용중인 강사장교의 장기 계측을 통한 온도 거동에 관한 연구
이덕근 ( Lee Deok-keun ),김규선 ( Kim Gyu-sun ),오달수 ( Oh Dal-soo ),이상철 ( Lee Sang Cheol ) 한국구조물진단유지관리공학회 2011 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.15 No.1
It is very difficult to analyze the behavior of the cable-stayed bridge because it has complicated structures with the high degrees of statical indeterminacy. Therefore not only the measured data but also the finite element method must be used to analyze the long-term behavior of cable stayed bridge in service. Typically, over 90% of the total design load for the cable supported structures such as the cable stayed bridges, the suspension bridges are dead load, live load and wind load but the temperatures are predominant loads in the long-term behavior of the cable stayed bridge. In this study, the long-term behavior of the bridge to temperature changes is evaluated based on the measured data(temperature, strain, displacement, frequency, etc.) and the result of finite element analysis.