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채원규(Chai, Won-Kyu),이증빈(Lee, Cheung-Bin),최미라(Choi, Mi-Ra),박주원(Park, Ju-Won),김성헌(Kim, Seong-Heon) 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.15 No.1
Many of the researchers have tried to enhance the satisfaction of both users and owners of bridge structures by applying the asset management methodology. This study is to develop more efficient the level of service and asset value evaluation for bridge management by the fuzzy theory. Based on various literature review, an asset management procedure for bridge management was suggested, and appropriate practices at each step were given. The suggested procedures include the determination of operation and maintenance strategy, level of service, performance measure, valuation of assets, and decision-makings. In addition, this study suggests an applicable decision-makings process for the resource distribution based on the management strategy. the fuzzy fault tree analysis(FFTA) model with application of fuzzy logic method is proposed. predicting result shows high accuracy. The proposed FFTA model is analyzed to evaluate level of service and asset value evaluation with a change of performance measure. As the result, the proposed FFTA model can be used to design the level of service and asset value evaluation for bridge asset management.
채원규 ( Chai Won-kyu ),이증빈 ( Lee Cheung-bin ),최미라 ( Choi Mi-ra ),박주원 ( Park Ju-won ),김성헌 ( Kim Seong-heon ) 한국구조물진단유지관리공학회 2011 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.15 No.1
Many of the researchers have tried to enhance the satisfaction of both users and owners of bridge structures by applying the asset management methodology. This study is to develop more efficient the level of service and asset value evaluation for bridge management by the fuzzy theory. Based on various literature review, an asset management procedure for bridge management was suggested, and appropriate practices at each step were given. The suggested procedures include the determination of operation and maintenance strategy, level of service, performance measure, valuation of assets, and decision-makings. In addition, this study suggests an applicable decision-makings process for the resource distribution based on the management strategy. the fuzzy fault tree analysis(FFTA) model with application of fuzzy logic method is proposed. predicting result shows high accuracy. The proposed FFTA model is analyzed to evaluate level of service and asset value evaluation with a change of performance measure. As the result, the proposed FFTA model can be used to design the level of service and asset value evaluation for bridge asset management.
기존RC교량 바닥판의 유지관리를 위한 전문가 시스템 개발
손용우 ( Sohn Yong-woo ),이증빈 ( Lee Cheung-bin ),이채규 ( Lee Chai-kyu ),손승현 ( Son Seung-hyun ),안영기 ( Ahn Young-ki ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
The purpose of this study makes a retrofit and rehabilitation practice trough the analysis and the improvement for the underlying problem of current retrofit and rehabilitation methods. Therefore, the deterioration process, the damage cause, the condition classification, the fatigue mechanism and the applied quantity of strengthening methods for RC deck slabs were analtzed. Artificial neural networks are efficient computing techniqures that are widely used to solve complex problems in many fields. In this study, a back-propagation neural network model for estimating a management on existing reinforced concrete bridge decks from damage cause, damage type, and integrity assessment at the initial stsge is need. The training and testing of the network were based on a database of 36. Four different network models werw used to study the ability of the neural network to predict the desirable output of increasing degree of accuracy. The neural networks is trained by modifying the weights of the neurons in response to the errors between the actual output values and the target output value. Training was done iteratively until the average sum squared errors over all the training patterms were minimized. This generally occurred after about 5,000 cycles of training.
김종길 ( Sohn Yong-woo ),손용우 ( Lee Cheung-bin ),이증빈 ( Lee Chai-kyu ),이채규 ( Ahn Young-ki ),안영기 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.1
Recently, the corrosion and aging of reinforced concrete bridges are of great concern inpracitice. The corroded reinforced bars in concrete influences not only the safety of the bridge structures, but olso the flexural strength of reinforced concrete members. The flexural strength charateristics and economic analysis of corroded rebars in concrete concidering performance evalution have not been well clarified yet. The purpose of the presnt study, therefore, to explore the resistance degradation function and life cycle costs for service life of reinforced concrete bridges according to the decrease of corrosion of steel bars. The present formula has been proposed to calculate the flexural strength decrease according to corrosion rate. The present study allows more accurate evalution of the residual capacity of partially reinforced concrete bridge beams under corrosion.
김종길 ( Sohn¸ Yong-woo ),손용우 ( Lee¸ Cheung-bin ),이증빈 ( Lee¸ Chai-kyu ),이채규 ( Ahn¸ Young-ki ),안영기 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.2
This paper aims to propose a method that helps maintenance engineers to evaluate the damage states of bridge structure systems by using a Fuzzy Fault Tree Analysis. It may be stated that Fuzzy Fault Tree Analysis may be very useful for the systematic and rational fuzzy reliability assessment for real bridge structure systems problems because the approach is able to effectively deal with all the related bridge structural element damages in terms of the linguistic variables that incorporate systematically experts experiences and subjective judgement. This paper considers these uncertainties by providing a fuzzy reliability-based framework and shows that the identification of the optimum maintenance scenario is a straightforward process. This is achieved by using a computer program for LIFETIME. This program can consider the effects of various types of actions on the fuzzy reliability index profile of a deteriorating structures. Only the effect of maintenance interventions is considered in this study. However, any environmental or mechanical action affecting the fuzzy reliability index profile can be considered in LIFETIME. Numerical examples of deteriorating bridges are presented to illustrate the capability of the proposed approach. Further development and implementation of this approach are recommended for future research.
염해도장을 통한 콘크리트 구조물의 내구성능 향상 및 경제적 효과분석
김성헌 ( Kim Seong-heon ),손영현 ( Son Young-hyun ),박주원 ( Park Ju-won ),이증빈 ( Lee Cheung-bin ),채원규 ( Chai Won-kyu ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.2
In this thesis, detailed assessment for durability performance were performed on the chloride protected concrete structures to investigate the effectiveness of chloride protection. And economical efficiency for the chloride protected concrete structures were studied by LCC(Life Cycle Cost) analysis. In the comparison result of the first section repaur time, it was found that the chloride protected concrete structures was economical better than the non-protected concrete structures in the long term. According to the analysis result of the accumulated chloride concentration by used time and chloride iorn concentration by depth, it can be seen that the permeate through time from chloride has increased two times in the chloride protected concrete structures.