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Steel Plate Girder 교량의 동특성 분석을 위한 FE모델법
허광희 ( Heo Gwanghee ),이규 ( Lee Giu ),신형철 ( Shin Heung Chul ),전준룡 ( Jeon Joon Ryong ),김만구 ( Kim Man Goo ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
This paper aims to develop a FE modeling method which would be applied to analyze the dynamic characteristics of Steel Plate Girder (SPG) bridge. In order to do this, the bridge is interpreted on three models: a one-dimensional form simplified by beam element, a two-dimensional form simplified by shell element, and finally a three-dimensional detailed form. The results obtained from the interpretations are contrasted to the ones from the Auto Spectrum experiments performed by random excitation, and then each of three models is assessed in terms of its characteristics and validity. Although on the one-dimensional beam model the results are produced only in the bending which is caused by the geometrical peculiarities of FE model, they turn out to be very close to the results of the experiment or of the three-dimensional detailed model. Therefore the one-dimensional beam model is presented as an excel lent method which would be applied on the pre-research stage or the decision-making stage for a measuring instrument. The two-dimensional shell model is proved to be excel lent at defining the Mode shape of bending and twisting of leveled structure. Finally, the three-dimensional detailed model enables us to assess even subtle movements considering the mutual actions of each slice which is composed of mixed materials.
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.