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모형사장교의 실계측 데이터를 이용한 손상검출법에 관한 연구
허광희 ( Heo Gwanghee ),이규 ( Lee Giu ),최만용 ( Choi Mhan-young ),윤현도 ( Yun Hyun-do ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
This paper aims toestimate the workability of a damage detection method which uses two dimensional strain energy by measured mode shape vector for the prototype cable stayed bridge. In order to apply this damage detecting method, the measured mode shape vectors have been acquired from the structure before and after damage. The experiments in the prototype cable stayed bridge were performed according to three different damage scenarios on damage ratio and damage location. And the measured mode shapes gained from the experiments were used to calculate the 2-D strain energy. Thereafter, the damage indices were calculated using 2-D stain energy based on measured mode shape vector between the undamaged and damaged structure. It is thereby concluded that the 2-D strain energy damage detecting method based on measured mode shapes demonstrates excel lent workability, regardless of damage ratio and damage location.
2D-Dynamic Strain Energy를 이용한 모형사장교의 손상평가
허광희 ( Heo¸ Gwanghee ),이규 ( Lee Giu ),최만용 ( Choi¸ Mhan-young ),신형철 ( Shin Heung Chul ),이진옥 ( Chin Ok Lee ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
This paper aims to develop a method to designate damage points and assess their degrees in cable-stayed bridges by calculating the dynamic strain energy change on two-dimensional level. First of all, we present a method by which the damage index is obtained, and then we calculate a damage index using numerically obtained modal data according to the presented method. Next, all those data are classified into two categories: data before damage and ones after damage. And then the normalized damage index is calculated. In order to get modal data, we make up four damage scenarios: cable damage, single deck damage, one-direction double damage, and two-direction double damage. Each of Modal data from those damage scenarios were used to the tenth mode, and the degree of damage was made to be between three and nine percents in load capacity ratio. Although damage point is rather ambiguous in the double damage scenario, all in all, the damage points and its degree were relatively well designated in all damage scenarios.
단일 능동제어 시스템의 최적 계측 위치를 이용한 사장교 유지관리방안
이동기 ( Lee Dong-gi ),이규 ( Lee Giu ),허광희 ( Heo Gwanghee ),신형철 ( Shin Heung Chul ),최만용 ( Choi Mhan-young ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.1
This paper aims to find the optimal sensor locations on the bases of unified control system to minimize the observation cost while satisfying accuracy requirements of system performance for cable-stayed bridges. A new optimal sensor-location algorithm was developed using output feedback of unified control concept which can reduce observation cost associated with constrained observability matrix. This proposed algorithm was applied to the four degree of freedom structural system which contains the same complexity and structural characteristics as a cable-stayed bridge. It also proved to be useful to choose the best sensor location for controllability and observability of the structural system.
단일 능동제어 시스템의 최적 계측 위치를 이용한 사장교 유지관리방안
이동기(Lee Dong-Gi),이규(Lee Giu),허광희(Heo Gwanghee),신형철(Shin Heung chul),최만용(Choi Mhan-Young) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This paper aims to find the optimal sensor locations on the bases of unified control system to minimize the observation cost while satisfying accuracy requirements of system performance for cable-stayed bridges. A new optimal sensor-location algorithm was developed using output feedback of unified control concept which can reduce observation cost associated with constrained observability matrix. This proposed algorithm was applied to the four degree of freedom structural system which contains the same complexity and structural characteristics as a cable-stayed bridge. It also proved to be useful to choose the best sensor location for controllability and observability of the structural system.