Gradual Bilinear Method를 이용한 사장교의 케이블 손상응답 해석

Abstract

Cable-stayed bridge, which is one of the representative long-spanned bridge, needs prompt maintenances when a stay cable isdamaged because it may cause structural failure of the entire bridge. Many researches are being conducted to develop abnormalbehavior detection algorithms for the purpose of shortening the reaction time after the occurrence of structural damage. To improvethe accuracy of the damage detection algorithm, ample observation data from various kinds of damage responses is needed. However, it is difficult to measure an abnormal response by damaging an existing bridge, numerical simulation can be an effectivealternative. In most previous studies, which simulate the damage responses of a cable-stayed bridge, the damages has beenconsidered as a load variation without regard to its stiffness variation. The analyses of using these simplification could not calculateexact responses of damaged structure, though it may reserve a sufficient accuracy for the purpose of bridge design. This studysuggests Gradual Bilinear Method (GBM) which simulate the damage responses of cable-stayed bridge considering the stiffness andmass variation, and develops an analysis program. The developed program is verified from the responses of a simple model. Theresponses of a existing cable-stayed bridge model are analyzed with respect to the fracture delay time and damage ratio. Theresults of this study can be used to develop and verify the highly accurate abnormal behavior detection algorithm for safetymanagement of architecture/large structures.