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교량의 LCP(Life Cycle Profile)추정을 위한 연구
이채규(Lee Chai-Kyu),안영기(Ahn Young-Ki) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.- No.-
In this study, LCP along with a subset of the BMS data was investigated and several mathematical expressions were proposed and evaluated. The condition ratings of a bridge were trasformed into the numerical indices through fuzzy logics with real field data. From the numerical results. it is concluded that the mathematical LCP model of <수식> is shown to be the fittest one to express the condition rating varied with the age. This has been drawn from the case study of slab bridges under the similar conditions. On the other hand, if the conditions of management are not uniform any LCP model cannot be commonly used.
교량의 LCP(Life Cycle Profile)추정을 위한 연구
이채규 ( Lee Chai-kyu ),안영기 ( Ahn Young-ki ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1
In this study, LCP along with a subset of the BMS data was investigated and several mathematical expressions were proposed and evaluated. The condition ratings of a bridge were trasformed into the numerical indices through fuzzy logics with real field data. From the numerical results, it is concluded that the mathematical LCP model of y=□□□ is shown to be the fittest one to express the condition rating varied with the age. This has been drawn from the case study of slab bridges under the similar conditions. On the other hand, if the conditions of management are not uniform any LCP model cannot be commonly used.
안영기(Ahn Young-Ki),이채규(Lee Chai-Kyu),이진완(Lee Jin-Wan) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Life cycle profiles(LCP) of bridge structures are indispensable for the life cycle cost(LCC) evaluations of bridge system. The bridge under considerations may be newly-designed one or one in service. Thus, a systematic study of LCP is essential for both reliable LCC evaluation and strategic bridge management. LCP is mainly influenced by the structural environment in nature. In this study, LCP along with a subset of the BMS data was investigated and several mathematical expressions were proposed and evaluated. From the numerical results, it is concluded that the mathematical LCP model of y=y0²-at is shown to be the fittest one (R=0.815) to express the condition rating varied with the age.
안영기 ( Ahn Young-ki ),이채규 ( Lee Chai-kyu ),이진완 ( Lee Jin-wan ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.2
Life cycle profiles(LCP) of bridge structures are indispensable for the life cycle cost(LCC) evaluations of bridge system. The bridge under considerations may be newly-designed one or one in service. Thus, a systematic study of LCP is essential for both reliable LCC evaluation and strategic bridge management. LCP is mainly influenced by the structural environment in nature. In this study, LCP along with a subset of the BMS data was investigated and several mathematical expressions were proposed and evaluated. From the numerical results, it is concluded that the mathematical LCP model of □□□□ is shown to be the fittest one (R=0.815) to express the condition rating varied with the age.
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.
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.
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.
교량의 생애주기비용 산정을 위한 Life Cycle Profile에 관한 연구
안영기(Ahn Young-Ki),정영준(Chung Young-Jun),이채규(Lee Chai-Kyu) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
As the number of bridges requiring maintenance activities increases rapidly, it is necessary to adopt the life cycle cost analysis as a tool for optimal economical selection. Quantifying the condition assessment of indivial bridge and selecting the rational deteriorating model are essential for accurate life cycle cost analysis of bridges. In the study, a method is proposed that quantify the diagnosis results for existing bridge structures as AI(Apprarance Index), DI(Durability Index), CI(Condition Index), LI(Load resistance Index) and TI(Total Index) using fuzzy theory. Furthermore, revised condition rating curves having linear type, parabilic type, cubic type and square root type ar proposed on the basis of existing condition rating curves of domestic and foreign study. To prove the adaptability, for RC slab bridge of 180m, various indexes are calculated by fuzzy theory and the demanding rehabilitation costs for 80-year-life time are evaluated on the basis of revised condition ration curves. Considering quantification of bridge condition rating and life cycle cost analysis considering the various aspects of bridge structures are possible, the proposed method in this study will become a useful tool for life cycle cost analysis of bridge structures
김종길(Kim Jong-Kil),손용우(Sohn Yong-Woo),이중빈(Lee Cheung-Bin),이채규(Lee Chai-Kyu),안영기(Ahn Young-Ki) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
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 also 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.
교량의 생애주기비용 산정을 위한 Life Cycle Profile 에 관한 연구
안영기 ( Ahn Young-ki ),정영준 ( Chung Young-jun ),이채규 ( Lee Chai-kyu ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.1
As the number of bridges requiring maintenance activities increases rapidly, it is necessary to adopt the life cycle cost analysis as a tool for optimal economical selection. Quantifying the condition assessment of indivial bridge and selecting the rational deteriorating model are essential for accurate life cycle cost analysis of bridges. In the study, a method is proposed that quantify the diagnosis results for existing bridge structures as AI(Apprarance Index), DI(Durability Index), Cl (Condition Index), LI(Load resistance Index) and TI(Total Index) using fuzzy theory. Furthermore, revised condition rating curves having linear type, parabilic type, cubic type and square root type are proposed on the basis of existing condition rating curves of domestic and foreign study. To prove the adaptability, for RC slab bridge of 180m, various indexes are calculated by fuzzy theory and the demanding rehabilitation costs for 80-year-life time are evaluated on the basis of revised condition ration curves. Considering quantification of bridge condition rating and life cycle cost analysis considering the various aspects of bridge structures are possible, the proposed method in this study will become a useful tool for life cycle cost analysis of bridge structures.