예방적 유지관리를 통한 교량의 생애주기비용 절감 효과 분석
Bridge Life Cycle Cost Analysis of Preventive Maintenance
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초록
본 논문은 교량의 예방적 유지관리 효과를 생애주기비용 절감 측면에서 분석 하였다. 예방적 유지관리는 현재 실시되고 있는 대응적 유지관리 전략과 대비 되는 유지관리 전략으로 교량의 열화지연을 통해 궁극적으로는 교량의 사용수명을 연장 시키며 생애주기비용을 절감시키는 유지관리 전략이다. 이러한 예방적 유지관리 효과를 분석하기 위해 교량의 공용연수에 따른 건전도 점수 변화 모델과 FHWA 자료를바탕으로 한 국내 고속도로 교량의 건전도 점수에 따른 보수·보강 비용 모델을 제시 하였다. 제시한 복수의 모델과 국내외 참고 문헌을 바탕으로 제안된 예방적 유지관리 항목(청소와 도장)의 비용과 주기를 활용하여 사용수명 100년까지의 표준교량(1,730 m2/교량) 당 생애주기 비용과향후 20년간의 고속도로 총 유지관리 비용을 산정 하였다. 분석 결과 100년간 예방적 유지관리 활동으로 인해 교량 당 5억원의 절감효과를 볼수 있으며 현재 예방적 유지관리 활동을 실시할 경우 20년 후(2035년)에는 총 1,837억원, 즉 연간 약 92억원의 비용 절감효과를 볼 수 있는 것으로 분석 되었다.
Abstract
The paper aims at evaluating effects of preventive maintenance on life cycle cost(LCC) reduction of bridges. The preventive maintenanceactivities capable to delay bridge deteriorations can reduce overall maintenance costs and extend service life of a bridge by regularly providingmaintenance activities and avoiding larger maintenance(repairs or rehabilitations) costs. Couple of prediction models were proposed in order to calculateLCC of a typical bridge: a health score model and repair·rehabilitation cost model. In addition, the maintenance activities such as wash and paintingwere also suggested in order to consider effects of preventive maintenance in the analysis based on literature reviews. According to analysis results,new maintenance strategy(reactive maintenance + preventive maintenance) can save ₩0.5 billion per bridge for future life-cycle costs over 100 yearanalysis or ₩184 billion for entire HBMS(Highway Bridge Management System) inventory over 20 years. Small investments for preventive maintenancein improved bridge management can have a very significant return when considering the large bridge inventory.
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