In light of the maintenance of underground structures, the evaluation scope of precise inspection for safety and diagnosis have been revised. Crack, leakage, deterioration, and drainage system are evaluated with field inspection in maintenance manner. It also proposed that the additional revision of the precise inspection for safety and diagnosis.

In this paper, the maintenance characteristics for the abutment and pier in highway bridges are investigated. The repair and rehabilitation properties are integrated from the Highway Bridge Maintenance System until 2013. Whole numbers of the abutment and the pier in highway bridges are over 37,000. The repair and/or rehabilitation are carried out for the substructure of about 10,240. More than 35 billion won of budget for repair and rehabilitation were used until now. It can be known that during one year about 37,000 won of budget has been used to maintain and preserve each substructure.

A pipe-rack structure exposed to various environmental conditions is one of the critical structures for the safety of a plant industry. Based on a selected, typical pipe-rack structure, this study evaluated the behavior of the pipe-rack structure accounting for the operating condition of the pipe and at the same time the effect of environmental conditions.

This study was conducted to investigate the Structural Health Monitoring(SHM) system built in large-scale structures. Recently large-scale structures such as bridges and high-rise building have installed SHM system and using the SHM system, large-scale structures are monitoring the status of structures. In many practical cases, SHM systems are used sensor, such as strain gauge, inclinometer, accelerometers, seismic, wind anemometer, GPS, to monitor status of structures. This case study foreground potential future research dealing with SHM system using integrated sensor module.

The goal of this study is to investigate an evaluated aerial work flatform for structure maintenance and repair. This study includes technical components and economic aspect. The investigation is extend and helpful to accomplish successful business according to foreign and domestic business.

The most commonly used material of construction structures is steel. In this study, Epoxy-based coating materials and Ceramic-based coating materials durability were investigated. Exposed water immersion, chloride immersion, temperature changes, freezing and thawing for severe environments to simulate and environmental conditions are showed degraded in epoxy-based coating materials.

Even though a falling-off in durability and a decrease of safety was caused by environmental factors, there are various cases that it is difficult for structure to diagnose and review exactly because of their working condition. In this study, we show an example which is an inspection of a small waterway culvert having three boxes. It will be used helpfully to evaluate a like structure.

Cracks in concrete structures should be measured periodically to assess potential problems in durability and serviceability. Conventional crack measurement problems in durability and serviceability. Conventional crack measurement systems depend on visual inspections and manual measurements of the crack features using microscope and crack gage. However, conventional methods take time as well as manpower, and lack quantitative objectivity resulted by inspector. In this study, crack width detection of concrete structures using image processing and present a hardware specification throughout the experiment.

Reinforced concrete structures are deteriorated in a few decades due to various causes, such as carbonation. Therefore it is important to evaluate the accurate carbonation depth in order to secure the durability of the structure. In this paper, carbonation depth by drilling excavation and splitting core sample are compared. Also, the procedure for estimating the appropriate repair zone is proposed, with the result of carbonation depth and steel bar detection.

This paper aims at featuring dynamic characteristic of cable-stayed bridge by means of an artificial filter bank(AFB), for the purpose of effective acquirement of real-time valid dynamic(acceleration) responses. The AFB was embedded into a wireless sensing system. Also, through modal testings performed on a model of cable-stayed bridge, its dynamic characteristics were featured on natural frequency. They were evaluated in comparison to wired measurement responses and FE analysis. Finally, the dynamic wireless measurement system on the basis of AFB were found technologically and economically effective by obtaining valid dynamic(acceleration) responses whose size was compressed over the frequency range of interest.

The Korean electric power industry autonomously developed the Korea Electric Power Industry Code (“KEPIC”) with political support from the government with a view to creating domestic codes and standards for electric power facilities. Since KEPIC was initially issued in November 1995, the Korea Electric Association (“KEA”) has consistently updated it, developing new codes and standards like Structural Maintenance Inspection and so on.

This Paper Checks Requirements of Nondestructive Examination in KEPIC-S(Structure Field in Korea Electric Power Industry Code). And Remind other Requirements differing with KEPIC-MEN That is a Sub-Suction in KEPIC.

In this paper, decentralized data process based system identification(SI) method for building structure is proposed. For verification of the method, an experimental study was performed and the validity of the method was confirmed using unused displacement response in SI.

Large span roof structures require an analysis of their static and dynamic behavior depending on the physical parameters defining the structures. Therefore, it is highly desirable to estimate the parameters from observations of the system. However, the study of the behavior of such structures shows the existence of critical parameters. A small change in such parameters causes a significant change in the motion behavior. In this paper we study the parameter identification problem for shallow sinusoidal arches considering damping effect.

This study, in order to complement instability of analysis result stemming from the choice between reference point and comparison point which is pointed out as the defect of shift-share analysis, conducted shift-share analysis using Gross Regional Domestic Product (GRDP) trend of Geumgang area, Chungcheongnam-do for the period from 2000 to 2011. As a result of the analysis, ➀ industries that had both the positive Regional Share Effect (RSE) and Industrial Mixed Effect (IME) were service industries such as manufacturing industry, electricity gas, transportation industry, art, etc., which are positively influencing the regional industry. ➁ industries that had both the negative RSE and IME were other service industries such as wholesale and retail businesses, lodging industry, food industry, real estate business and leasing service, business service industry, public administration, etc., which provide basic livelihood services for the residents. ➂ industries that had the positive RSE and negative IME were agriculture, forestry and fishery industry, mining industry, construction industry, and educational service industry. ➃ industries that had the negative RSE and positive IME were info-communications industry, financial and insurance businesses, health industry, etc.

본 연구에서는 철골 골조 구조물의 안전성 모니터링을 위하여 계측한 변형률을 통해 구조물에 작용한 하중을 식별하는 알고리즘을 제안한다. 기존의 시스템 식별 연구에서 구조물의 강성 등을 변수화한 것과는 다르게, 본 연구에서는 구조물에 작용한 하중과 이로 인해 구조물에 발생하는 변형률 간의 관계를 행렬로 정의하고, 이 행렬 및 작용한 하중을 변수화 한다. 계측한 변형률과 변수를 통해 추정한 변형률사이의 차이를 오차함수로 설정하고 이를 최소화시키기 위해 최적화 알고리즘 중 하나인 유전자 알고리즘을 적용한다. 구해진 변수와 계측변형률을 통해 작용한 하중을 식별하고 구조물의 하중 변화 시 미계측 지점의 응답을 추정한다. 본 연구에서 제안하는 하중 식별 알고리즘을 검증하기 위해 3차원 철골 골조 구조물의 정적 가력 실험을 수행하였고, 계측한 변형률을 통해 가해진 하중을 낮은 오차 수준으로 식별할 수 있었다. 또한, 하중 조건 변화 시, 계측한 변형률을 통해 모니터링 대상이 되는 미계측 지점의 변형률을 0.17~3.13%의 오차 범위로추정하였다. 본 연구가 제안하는 식별법이 철골 구조물의 보다 현실적인 안전성 모니터링에 효과적으로 적용될 것으로 기대된다.

본 연구에서는 개인 컴퓨터의 플래시 메모리가 충분하지 않을 경우 대용량의 플래시 메모리를 필요로 하는 구조해석을 컴퓨터 프로그램으로 수행하는 방법론을 연구하였다. 이러한 문제점의 해결방안으로 강성행렬의 블록화기법 -강성행렬이 몇 개의 블록으로 나뉘고 각각의 블록에 대하여 행렬분해가 수행되는 방법- 을 제안하였으며 제안된 방법론을 바탕으로 컴퓨터 프로그래밍이 가능한 알고리즘을 제시하였다. 끝으로, 본 연구를 바탕으로 구조해석 프로그램을 개발하였으며 몇 가지 기초적인 구조해석 예제를 통하여 개발 알고리즘의 정합성 및 효율성을 확인할 수 있었다.