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김상효 ( Kim Sang-hyo ),양성만 ( Yang Sung-man ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.3 No.1
This study is performed to develop a rational damage assessment technique using neural networks combined with sensitivity analysis method, which can be applied to the large complex structural systems more efficiently. The objective of the study is to propose an efficient algorithm to design the optimum monitoring and damage assessment system with the limited budget. The most important structural elements are selected through the sensitivity analysis on the system failure probability, that is, the structural elements, whose damages increase the system failure probability most sensitively, are selected. The optimum placement of the monitoring sensors for determining the dynamic modal parameters is decided by evaluating the damage estimation errors of the trained neural network system due to the deletion of a specific monitoring position and selecting the monitoring positions that cause the large estimation errors compared with other positions. The validity and applicability of the developed techniques are demonstrated on truss' structure, and it is proven that the proposed technique is applicable to damage assessment with a reasonable accuracy.
김형태(Kim Hyung-Tae),조남소(Cho Nam-So),정지만(Jung Ji-Man),양성만(Yang Sung-Man) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
As the volume of traffic in southern part of the republic of Korea grew, expansion of transportation was required. In that purpose, the railway between Samnangjin and Gwangyang is being extended to a double-track line. This construction includes Nakdong bridge located across Nakdong river. This truss bridge is constructed in incremental launching method (ILM) and composed of two sections, straight line and curved one. Bridge construction in the method goes with the shift of roller supports which results in the change of structural system. To accomplish safe construction, the measurement during the whole launching stages. The locations of member in severe condition and the corresponding response values were estimated through the preliminary construction stage analysis. Based on the analysis, the measurement during construction was planned. Several sensors and measurement devices were installed at appropriate locations. During the whole launching stages, the measurement was performed and the corresponding data were monitored and stored in real time. The comparison of the responses from the analysis and the measurement showed no indication of yielding of the structural members. Consequently, the construction of Nakdong bridge was concluded to be relevant.