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Infrastructure Asset Management System for Bridge Projects in South Korea
홍태훈,채명진,김두연,구충완,이교선,진경호 대한토목학회 2013 KSCE Journal of Civil Engineering Vol.17 No.7
While there have been many studies on life cycle cost analysis and preventive maintenance planning, this study proposes an innovative method of bridge asset management in South Korea. Two different levels of approaches were used in this study. First, in the level of bridge elements, deterioration modeling and optimized maintenance repair and rehabilitation (MR&R) planning on bridge assets are proposed, using the bridge historical data of Han River in the city of Seoul. Second, the network level of bridge asset management is suggested, using historical MR&R cost and budget, overall-condition assessment results, and health index data. These two levels of approaches were developed into an Internet-based application so that facility managers can use them to review their past budgets and to plan their future budget based on historical data.
Service Life Estimation of Concrete Bridge Decks
홍태훈,정승현,한승우,이상엽 대한토목학회 2006 KSCE JOURNAL OF CIVIL ENGINEERING Vol.10 No.4
As existing bridges continue to deteriorate, the Korean Ministry of Construction and Technology (MOCT) including each State Department of Transportation (DOT) in the U.S. faces increasing demands on the limited funds available for bridge maintenance. In such circumstances, highway bridge owners need realistic and effective deterioration models to find the deterioration rate for present and future condition of the bridge deck and to estimate the end of service life of the bridge. The MOCT recently make it mandatory that life cycle cost analysis (LCCA) for value engineering be used to all government construction projects including private sector projects over 10billion won in terms of Korean currency. In the LCCA concept, it is important to estimate the end of service life of the bridge. Several models are available to predict the deterioration rates of bridge main structure such as deck, superstructure, and substructure. This paper presents a new model that predicts the end of service life in concrete bridge decks based on (i) the deterioration rate and (ii) the condition rating for decommissioning. This paper proposes the deterioration models of concrete bridge decks for 30 DOTs. The data required for developing the models was obtained from the National Bridge Inventory (NBI) database. Whereas, the additional data required for this research were collected through a questionnaire survey. Statistical linear regression method was used to analyze the deterioration models of concrete bridge decks for each DOT.
State-of-practice and State-of-Art for the Project Cycle Time Reduction
홍태훈 대한건축학회 2005 Architectural research Vol.7 No.2
There are no formal decision tools or guidelines to assist owners and contractors in choosing delivery systems and project strategies that would allow for a radical reduction in project cycle time from the preplanning phase through project start up. Therefore, it is important to identify the state-of-practice and the state-of-art on methods of achieving radical reduction defined as a reduction of 25% or more in overall project cycle time. A comprehensive literature review, three questionnaire surveys, and the seven case studies were conducted and the data obtained from them were analyzed to establish the state-of-practice and state-of-art for project cycle time reduction techniques.
Essence Applicability Matrices for the Reduction of Project Cycle Time
홍태훈,손재호 대한건축학회 2006 Architectural research Vol.8 No.1
Global competition and reduced project life cycle ultimately puts greater performance requirements on the capital project delivery systems used to maintain competitiveness. Despite continuing improvements in delivery cycle time, business owners of facilities continue to demand greater improvements in project delivery cycle time. Therefore, it is very important to investigate the various techniques and methods leading to reduction in project cycle time and also identify the applicability of identified techniques and methods. This paper introduces reduction techniques identified through literature review (i.e, Schedule Reduction Techniques (SRTs), Management Techniques (MTs), and Construction Institute Industry (CII) Best Practices (BPs). In order to collect applicability of these techniques under different project phases (Pre-project planning (PPP), Design (D), Material Management (MM), Construction (C), and Start-up (SU)), the Essence Applicability Matrices (EAM) is used.
Maintenance, Repair and Rehabilitation (MR&R) Practice for Concrete Bridge Decks
홍태훈 대한건축학회 2005 Architectural research Vol.7 No.2
Over the years, existing bridges have had various degrees of maintenance to extend the service life. As the existing bridges continue to deteriorate, however, each Department of Transportation (DOT) of the United States of America faces increasing demands on the limited funds available for bridge maintenance. Therefore, it is very important for State Department of Transportations to establish Maintenance, Repair, and Rehabilitation (MR&R) strategies for bridge structures such that funds get allocated for appropriate maintenance over the service life. This paper identifies the state-of-art and the state-of-practice of MR&R actions and the use of MR&R strategies in concrete bridge decks. In addition, a questionnaire survey was conducted to identify the type and timing for MR&R actions as well as existing MR&R strategies taken in concrete bridge deck by each DOT. This paper also presents the results of the survey.