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염해 열화된 콘크리트 구조물의 단면복구용 보수재료의 정량적 성능 기준 설정 및 최적선정 모델링
도정윤 ( Do Jeong-yun ),김두기 ( Kim Doo-kie ),송훈 ( Song Hun ),소승영 ( So Seung-young ),소양십 ( Soh Yang-seob ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
The durability of concrete repairs depends mainly on the correct choice and use of repair materials. Some studies related to the selection of repair materials are advocating as a fundamental principle, that is, repair like with like. This is, however, very illogical and not an engineering approach. This study is interested in configuring the minimum performance criteria and modeling the optimal selection of repair materials for chloride-deteriorated concrete structure. As the result of the study, the useful evaluation equation for optimal repair selection was formulated as below. [(0.034×R21)+(0.142×R22)+(0.240+R23)]+[(0.128×R24)+(0.033×R25)+(0.075+R26)+(0.01×R27)+(0.01+R28)+(0.024+R29)] The variables in this equation are divided into two parts, the required chemical performance and the required physical performance, respectively. The former is composed of alkali-resistance, chloride permeability and electrical resistivity. The latter is composed of compressive strength, tensile strength, adhesive strength, drying shrinkage, elasticity and thermal expansion.
철도 PC Beam교량의 전이확률을 이용한 상태저하 모델개발
권세곤(Kwon Se-Gon),박미연(Park Mi-Yun),김두기(Kim Do-Kie),진남희(Jin Nam-Hee),구소연(Ku So-Yeun) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
Recently, as a method of green-development and reduction of carbon dioxide emissions, increased interest has been focused on a railway. Furthermore, an intensive study has been processed on capabilities of maintenance activities, economic efficiency of maintenance on rail structure and a design of railway structure as well as the development of materials. The purpose of this paper is to develop a deteriorated model of PC Beam Bridge due to timely changes and maintenance activities. Typically, there is definite difference between maintained bridges and non-maintained bridges. As a result of proper maintenance activity, a life time of a structure can be enhanced. In this study, we will research and analyze structures with ongoing maintenance. We will also process same procedures on structures without maintenance. Therefore, we can establish the significant role in a conditional change of a structure. Based on a study, we accomplish the development of a condition-deteriorated model. To develop deteriorated model of PC Beam Bridge, We apply Marcov Theory and develop a transition probability to show the life time of bridge. This study will provide a great benefit to decision making for maintenance activities on the railway bridges for future.
Project level에서의 철도 PC Beam교량의 경년열화모델구성 및 유지관리비용 추정
권세곤(Kwon Se-Gon),박미연(Park Mi-Yun),도정윤(Do Jeong-Yun),김두기(Kim Do-kie) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Construction project have extremely high risk in the process of construction owing to unexpected event, like as design amendment. As a result, owner have to endure enormous extra-cost to control the risk and continue to the project having more higher uncertainty. Also, if the structure is completed, it is needed that the structure is protected and maintained continuously during life cycle time to satisfying original aim of structure itself. LCC analysis to calculate cost of structure alternatives divides into two stage, one is design_LCC and the other is maintenace_LCC. But two stages all is needed in the transition deterioration model to calculate more reasonable LCC analysis. This paper developed the model using analysis of FMS contents and survey from professional about Prestressed concrete beam girder bridge(PC Beam bridge)in railway. The model is focused in project level of PC beam because any condition state information for element level analysis can not get up. This paper is intended to use the developed model in LCC analysis of PC Beam bridge in railway and constitute the foundation to perform more deep study in the near future.