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퍼지 근사추론법에 의한 손상구조물의 건전도평가시스템 개발
이증빈 ( Lee Cheung-bin ),박주원 ( Park Ju-won ),장영부 ( Jang Foung-boo ) 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2 No.1
It has been recognized a considerable number of damaged structures require repairing and alteration from time to time. Since most of the existing structures may suffer from defect, corrosion and damage, it is an emergent and important task to establish a method of evaluating the intergrity of damaged structures. In this paper, an attempt is made to develope a integrity assessment for damaged structures using fuzzy approximate reasoning. By using the evaluating system, the analysis is performed through such linguistic valiables as "Large", "medium", "small" etc. Information of the linguistic valiables is transmitted from the input events to the top events, in which weightening is taken into account on the evaluation of each damage factor.
퍼지결함수분석을 이용한 교량시스템의 상태 및 안전성평가
이증빈 ( Lee Cheung-bin ),나기현 ( Na Ki-hyun ),손용우 ( Sohn Young-woo ),박주원 ( Park Ju-won ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.3 No.1
This paper aims to propose a method that helps maintenance engineers to evaluate the damage states of bridge systems by using a Fuzzy Fault Tree Analysis(FFTA). It may be stated that Fuzzy Fault Tree Analysis may be very useful for the systematic and rational condition and safety assessment for real bridge systems problems because the approach is able to effectively deal with all the related bridge system damages in terms of the linguistic variables that incorporate systematically experts experiences and subjective judgement.
녹색성장을 위한 구조물의 VE/LCA 분석 및 자산관리 평가 시스템 개발
이증빈 ( Lee Cheung-bin ),박주원 ( Park Ju-won ),손영현 ( Son Young-hyun ),김성헌 ( Kim Sung-heon ),최미라 ( Choi Mi-ra ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
In this study, a new method for the structures integrated VE(value engineering) approach based on LCA(life cycle assessment) and asset management is proposed to overcome the limit of the existing VE/LCC methods and to implement the preventive structures reliability-based integrated VE/LCA and asset management system. The proposed method can establish the reliability-based maintenance strategy and asset management system of the deteriorating infrastructures considering the abiotic resource depletion and global warming condition, etc as well as LCC(life cycle cost). The life cycle cost is evaluated by considering not only the direct maintenance cost bug also the user and environment cost. By using the developed program, this study proposed a process of asset management scenario applying to be the selection of bridge superstructures of national road, and the study examined the proposed method by establishing a reliability-based integrated VE/LCA strategy and asset management system for the existing structure and its advantages. The result shows that the proposed method can be effectively applied to deciding the infrastructures reliability-based integrated VE/LCA strategy and asset management system.
녹색성장을 위한 구조물의 VE/LCA 분석 및 자산관리 평가 시스템 개발
이증빈(Lee, Cheung-Bin),박주원(Park, Ju-Won),손영현(Son, Young-Hyun),김성헌(Kim, Sung-Heon),최미라(Choi, Mi-Ra) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.1
In this study, a new method for the structures integrated VE(value engineering) approach based on LCA(life cycle assessment) and asset management is proposed to overcome the limit of the existing VE/LCC methods and to implement the preventive structures reliability-based integrated VE/LCA and asset management system. The proposed method can establish the reliability-based maintenance strategy and asset management system of the deteriorating infrastructures considering the abiotic resource depletion and global warming condition, etc as well as LCC(life cycle cost). The life cycle cost is evaluated by considering not only the direct maintenance cost bug also the user and environment cost. By using the developed program, this study proposed a process of asset management scenario applying to be the selection of bridge superstructures of national road, and the study examined the proposed method by establishing a reliability-based integrated VE/LCA strategy and asset management system for the existing structure and its advantages. The result shows that the proposed method can be effectively applied to deciding the infrastructures reliability-based integrated VE/LCA strategy and asset management system.
안종필,이증빈,박주원,유덕찬,Ahn, Jong-Pil,Lee, Cheung-Bin,Park, Ju-Won,Yu, Deog-Chan 한국건설관리학회 2007 건설관리 : 한국건설관리학회 학회지 Vol.8 No.5
최근 가치공학과 생애주기비용 분석의 중요성이 대두됨에 따라 항만구조물의 VE/LCC(Value Engineering/Life Cyccle Cost) 분석에 대한 연구개발이 활발하게 진행되고 있다. 반면에 항만구조물의 생애주기비용 산정과 가치분석의 실무 적용에 있어 이론적 모델과 표준지침 및 소프트웨어 등이 정립되어있지 않기 때문에 분석자에 따라 일관성과 전문성에 한계를 나타내고 있다. 특히 생애주기비용의 분석에 있어 현행의 확정론적 방법으로는 파괴손실비용의 산정이 어렵기 때문에 퍼지 신뢰성해석에 따라 파기확률을 파괴손실비용에 반영할 수 있는 확률론적 방법의 도입이 반드시 필요한 실정이다 따라서 본 연구에서는 안벽구조물의 설계에 있어 대안별 열화성능 차원의 설계를 수행하도록 유도하기 위하여 퍼지신뢰성 이론에 기초한 확률론적 VE/LCC 분석모델을 제안하였으며, 제안된 분석모델의 신뢰성과 활용성을 향상시키기 위한 측면에서 실제 대상 구조물에 적용하였다. 본 연구에서 제안된 방법론은 향후 다양한 분야의 설계 및 유지관리단계에서의 생애주기 비용과 가치분석의 의사결정에 활용되어질 것으로 사료된다. It is common that the analysis of VE/LCC is performed in design phase of quay wall structures. The analysis is mainly executed based on experience and engineering sense of expert considering the selection of construction method, construction and maintenance cost. Recently there are increasing demands on the analysis that includes uncertainty and vulnerability of input parameters, for this purpose, fuzzy reliability based probabilistic VE/LCC analysis model for quay wall structures is suggested. In VE/LCC analysis for quay wall structures, the application of probabilistic analysis method give very similar results compare with those of deterministic analysis method. It is anticipated that the methodology proposed in this paper can also be utilized in the design and maintenance phase of other facilities where decision making is made for the probabilistic life cycle cost and value analysis.
Fuzzy 개념을 이용한 RC도로교의 건전성평가 모델 개발
나기현,박주원,이증빈,정철원,Na, Ki-Hyun,Park, Ju-Won,Lee, Cheung-Bin,Jung, Chul-Won 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 논문집 Vol.2 No.2
In this study, an attempt is made to apply the concept of fuzzy-bayesian theory to the integrity assessment of RC highway bridge, and uncertainty states are represented in terms of fuzzy sets which define several linguistic variables such as "very good", "good", "average", "poor", "very 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. The fuzzy concept are also used as reliability indexes for the condition assessment based on the proposed models, the proposed fuzzy theory-based approach with the results of visual inspection and extensive field load tests are applied to the integrity assessment of a new RC highway bridge, namely, Jichok bridge.
측방유동 손상을 받은 RC 슬래브교의 보수·보강 사례분석
안종필 ( Ahn Jong Pil ),이증빈 ( Lee Cheung Bin ),박주원 ( Park Ju Won ),손영현 ( Son Young Hyun ),김대해 ( Kim Dae Hae ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
In this study, a case study on RC slab bridge damaged by a wide variety of a factor has been conducted . In this study, the site inspection for the damaged structure and the survey for the construction history as well as the numerical analysis have been conducted to find the main cause. On the basis of a series of cause analysis, it was found that the structure was mainly affected by a lateral flow, which is frequently occurred under the condition of soft soil and the excessive backfill load. The possibility for repairing and reinforcing rather than for reconstructing the structure has examined, including the economic analysis after finding the main cause. On the basis of the comprehensive study, the structure was successfully repaired and reinforced by the steel tube pile and the EPS block for effectively resisting the lateral flow. It is found by this case study that the comprehensive analysis for the possibility of the lateral flow in advance must be necessarily and carefully conducted when the structure is constructed on the soft soil and the backfill material and the backfill height is selected