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Fuzzy-Basian법에 의한 R.C도로교의 신뢰성 및 안전도평가
정철원 ( Jung Chul-won ),이중빈 ( Lee Cheung-bin ),나기현 ( Na Gi-hyun ),박주원 ( Park Ju-won ) 한국구조물진단유지관리공학회 1997 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.1 No.1
In this paper, an attempt is made to apply the concept of Fuzzy-Bayesian theory to the Reliability Analysis of R.C(Reinforced Concrete) Bridge, uncertainty states are represented in terms of fuzzy sets which define several linguistic variables such as “good”, “average”, ”poor”, etc. Especially, the concept of fuzzy conditional probability aids to derive a new reliability analysis which includes the subjective assessment of engineers without introducing any additional correction factors. Several numerical examples are presented to illustrate the method proposed herein.
박주원 ( Park Ju-won ),나기현 ( Na Ki-hyun ),손용우 ( Sohn Yong-woo ),이중빈 ( Lee Cheung-bin ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
The study is intended to propose a systematic procedure for the development of the condition assessment based structures safety and cost effective performance criteria for design and upgrading of bridge structures. A set of cost function models for life cycle cost analysis of bridge structures is proposed and thus the expected total life cycle costs(ETLCC) include initial(design, testing and construction) costs and direct · indirect damage costs considering repair · replacement costs, human losses and property damage costs, road user costs, and indirect regional economic losses costs. Optimum safety indices are presented based on expected total cost minimization using only tree parameters, which are the level of the failure cost to the initial cost(τ), the extent of increased initial cost by improvement in safety(ν) and the order of the initial cost function(n). From the numerical invetigations. it may be positively stated that the proposed optimum design procedure for bridge structures based on the ETLCC will lead to more rational, economical and safer design.
콘크리트구조물의 시간의존적 설계VE 및 LCC분석 모델
강형구(Kang Hyung-Goo),손용우(Sohn Yong-Woo),이중빈(Lee Cheung-Bin),최미라(Choi Mi-Ra),박주원(Park Ju-won) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.- No.-
In the resent years, the importance of VE (value engineering) and LCC (life cycle cost) analysis for concrete construction projects has been fully recognized Accordingly theoretical models, guidelines, and supporting software systems were developed for the value engineering and life cycle cost analysis for concrete construction including bridges and building systems. However the level of consensus on VE and LCC analysis resluts is still low due to the lack of reliable data on maintenance. This paper presents time dependent LCC model based value analysis method for rational investment decision making adn design altermative selection for construction of concrete structures. The proposed method incorporates a time dependent LCC model and a performance evaluation technique by fuzzy logic theory to properly handle the uncertainties associated with statistics data and to analyze the value of alternatives more rationally. The presented time dependent VE and LCC analysis procedure were applied to a real world project and this case study is discussed in the paper. The model and the procedure presented in this study can greatly contribute to design value engineering alternative selection, the estimation of the life cycle cost, and the allocation of budget for concrete construction projects.
김종길(Kim Jong-Gil),손용우(Sohn Yong-Woo),이중빈(Lee Cheung-Bin),이채규(Lee Chai-Kyu),안영기(Ahn Young-Ki) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
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 of 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(Kim Jong-Gil),손용우(Sohn Yong-Woo),이중빈(Lee Cheung-Bin),주필성(Ju Pill-Seong),안영기(Ahn Young-Ki) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Recently, the corrosion and aging of infrastructures are of great concern impracitice. The uncertainties of the corroded reinforced bars in concrete influences not only the safety of the bridge structures, but also the flexural strength of reinforced concrete members. This paper considers these uncertainties by providing a 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 Life Cycle Cost Analysis of Deteriorating Structures(LCCADS). This program can consider the effects of various types of actions on the 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 reliability index profile can be considered in LCCADS. Numerical examples of deteriorating infrastructures are presented to illustrate the capability of the proposed approach. Further development and implementation of this approach are recommended for future research.
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.
염해도장을 통한 콘크리트 구조물의 내구성능 향상 및 경제적 효과분석
김성헌(Kim, Seong-Heon),손영현(Son, Young-Hyun),박주원(Park, Ju-Won),이중빈(Lee, Cheung-Bin),채원규(Chai, Won-Kyu) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 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.
사회기반시설의 신뢰성 기반 유지관리 전략 및 자산관리 시스템 개발
김성헌 ( Kim Sung-heon ),김규덕 ( Kim Gyu-deok ),박주원 ( Park Ju-won ),손영현 ( Son Young-hyun ),이중빈 ( Lee Cheung-bin ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
In this study, a new method for the infrastructures maintenance is proposed to overcome the limit of the existing methods and to implement the preventive infrastructures reliability-based maintenance strategy and asset management system. The proposed method can establish the reliability-based maintenance strategy and asset management system of the deteriorating infrastructures considering the life-cycle condition and performance as well as LCC(life-cycle cost). The life-cycle cost is evaluated by considering not only the direct maintenance cost but also the user and failure cost. By using the developed program, this study proposed a process of maintenance scenario applying to be the bridge decks of national road, and the study examined the proposed method by establishing a reliability-based maintenance strategy and asset management system for the existing structure and its advantages. The result shows that the proposal method can be effectively applied to deciding the infrastructures reliability-based maintenance strategy and asset management system.
퍼지결함수분석에 의한 항만구조물의 유지관리전략 시스템 개발
김성헌 ( Kim Sung-heon ),김규덕 ( Kim Gyu-deok ),손영현 ( Son Young-hyun ),박주원 ( Park Ju-won ),이중빈 ( Lee Cheung-bin ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
In this study, a harbor maintenance system is developed to safety performance-based optimum maintenance strategy by considering the structural safety. A fuzzy fault tree problem is formulated to generate a maintenance scenarios which satisfies the balance among the conflicting objectives is applied to the performance and safety during the harbor lifetime and a fault tree analysis algorithm is applied to the system. By using the developed problem, this study proposes a process of optimum maintenance scenario applying to the harbor structures. The developed system improves the current methods of establishing the harbor maintenance strategy and can be utilized as an efficient tool to provide the harbor maintenance scenario corresponding to the various constraints and requirements of harbor agency.