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한경봉(Han Kyung-Bong),박준명(Park Jun-Myung),박선규(Park Sun-Kyu),김영진(Kim Young-Jin),최석정(Choi Suk-Jung) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
The seismic performance evaluation and retrofit process are very important in old existing bridge If the result is not appropriate, then a retrofit process are required Among a various retrofit method, the seismic Isolation is very useful method. Because it can be applied instead of old bearing In bridge In this study, effectiveness of seismic Isolation is rationally verified For this purpose, two seismic isolations used widely are selected and pseudo dynamic test are performed. Through the pseudo dynamic tests, it is showed that seismic isolations are reducing the magnitude of the forces transferred to the substructure and shifting the period of the bridge
한경봉 ( Han Kyoung-bong ),박선규 ( Park Sun-kyu ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
Model updating is a very active research field, in which significant efforts has been invested in recent years. Model updating methodologies are invariably successful when used on noise-free simulated data, but tend to be unpredictable when presented with real experimental data that are-unavoidably-corrupted with uncorrelated noise content. In this paper, Reanalysis using frequency response functions for correlating and updating dynamic systems is presented. A transformation matrix is obtained from the relationship between the complex and the normal frequency response functions of a structure. The transformation matrix is employed to calculate the modified damping matrix of the system. The modified mass and stiffness matrices are identified from the normal frequency response functions by using the least squares method. Two simulated system are employed to illustrate the applicability of the proposed method. The result indicate that the damping matrix of correlated unite element model can be identified accurately by the proposed method. In addition, the robustness of the new approach uniformly distributed measurement noise is also addressed.
한경봉 ( Han Kyung-Bong ),박준명 ( Park Jun-myung ),박선규 ( Park Sun-Kyu ),김영진 ( Kim Young-jin ),최석정 ( Choi Suk-jung ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
The seismic performance evaluation and retrofit process are very important in old existing bridge. If the result is not appropriate, then a retrofit process are required. Among a various retrofit method, the seismic isolation is very useful method. Because it can be applied instead of old bearing in bridge. In this study, effectiveness of seismic isolation is rationally verified. For this purpose, two seismic isolations used widely are selected and pseudo dynamic test are performed. Through the pseudo dynamic tests, it is showed that seismic isolations are reducing the magnitude of the forces transferred to the substructure and shifting the period of the bridge.
한경봉 ( Han Kyoung-bong ),박선규 ( Park Sun-kyu ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.3 No.1
This paper deals with the assessment of load carrying capacity of PSC-beam bridges according to continuity of spans. In this study, several factors which may affect the assessment of load carrying capacity of PSC-beam bridges are studied. These are effect of differential deflection among the girder and methods of finite element modeling. The differential deflection of the girders, which can greatly reduce the negative moments in a deck slab so, tensile stresses of top slab is reduced. Analytical solution and numerical analyses are performed and the results are compared with those of experimental studies for PSC-beam bridge. Based on the results of this study, an improved method is proposed for the assessment of load carrying capacity of PSC-beam bridges according to continuity of spans.
프리스트레스트 콘크리트 Beam 교량의 콘크리트 강도 평가를 위한 비파괴 검사
한경봉 ( Han Kyoung-bong ),천영덕 ( Chun Young-duk ),박선규 ( Park Sun-kyu ),이성희 ( Lee Sung-heu ) 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2 No.2
Due to the heterogeneous nature of a concrete, periodic inspections are compulsory to maintenance of quality of concrete structures. The major object of this study is to analyze and investigate experimentally the experimental equation for the estimate of compressive strength of prestressed concrete. In this study, surface hardness method, ultrasonic method are investigated to evaluate strength of concrete specimens. Specimens are cast in laboratory and cores are cut from specimens in order to estimate the accurate strength. These values are used to compare with calculated values from test data. The result shows that the proposed equation can reproduce the results at prestressed concrete beam girders more appropriately than previous equations.