강재 수문은 일반적으로 상대습도가 높고 부식에 대하여 열악한 환경에 설치되므로 다른 강구조물에 비하여 부식열화가 빠르게 진행될 수 있다. 강재 수문의 경우 수문부재의 설치환경에 따라 발생되는 부식환경의 차이가 나타날 수 있으며 이에 따라 발생되는 부식속도가 변화할 수 있다. 따라서 동일 구조물이라도 국부적 부식환경이 구조물 특성에 따라 변화할 수 있으므로 수문구조의 경우 수문의 구조형태와 이에 따른 수문부재의 설치 높이에 따라 변화할 수 있다. 본 연구에서는 강재 수문의 구조형태에 따른 상대적 부식환경차이를 수문부재의 높이에 따라 평가하기 위하여 실제 강재수문을 대상으로 모니터링 시험체를 부착하여 부식손상 모니터링을 실시하여 그 영향을 분석하였다.

본 연구에서는 분절형 콘크리트 블록과 아웃리거를 적용한 분절형 프리캐스트 패널 아치 교량의 분절형 프리캐스트 콘크리트 패널 연결부의 형상과 상세를 개선하기 위하여 프리캐스트 패널 연결부에 대한 3차원 비선형 구조해석을 실시하였다. 콘크리트 프리캐스트 패널의 경우 아치 교량의 특성에 따라 압축력이 작용하게 되므로 패널 연결부에 대한 지압 거동 특성을 반영할 수 있도록 원형 연결부를 적용하였으며, 본 연구에서는 이러한 패널 연결부의 특성과 상세에 따른 영향을 고려하기 위하여 프리캐스트 패널 연결부 상세와 지압 하중의 방향을 변화시켜 그 영향을 확인하였다.

The durability of a steel floodgate can have disadvantage to corrosion damage, because it is often come in contact with high humidity condition. In this study, to evaluate the corrosion rate depending on installation environment of a steel floodgate, atmospheric exposure test was performed using corrosion environment measurement sensors and monitoring specimens. From the correlation between the mean corrosion depth and corrosion current, the corrosion rate was estimated depending on the installed environment for the member of a steel floodgate.

For PHC pile, mechanical connection joints can be essential to connect PHC piles over 15m in length for deep foundation. This study was examined flexural capacity of PHC pile connected with high-performance connection device. To examine flexural capacity of PHC pile, two PHC piles with 5m length were connected using ring-type connecting plate developed recently. Its connection capacity and failure mode were evaluated through four-point flexure test.

본 연구에서는 국내에서 사용되고 있는 우레탄계, 세라믹계, 폴리실록산계 및 불소수지계 강교량용 도장계를 대상으로 실내 부식실험을 실시하여 도장계별 노화모델을 도출하였다. 상도를 구분하여 각 도장계별로 시험편을 제작하였으며, 직경 0.5, 1, 3, 5 mm의 원형 결함을 도입하였다. ISO 20340를 이용하여 극한환경을 모사한 부식촉진실험을 실시하였다. 도장계별 노화곡선은 원형결함의 노화면적을 기준으로 평가되었다. 노화곡선을 사용하여 공용중인 강교의 도장 사용수명을 평가하기 위하여 촉진배율을 산출하였으며, 촉진배율은 ISO 20340과 ISO 9223의 대기환경 부식속도를 기준으로 산출되었다. 실험결과, 노화진전속도는 원형결함의 크기와 상관없이 증가하였으며, 노화면적이 3%일 때 우레탄 도장계의 노화수명은 C2, C3, C4 및 C5 등급에서 약 31.8, 15.8, 9.9 및 3.9년으로 평가되었다.

The durability of the steel structure can be affected by atmospheric corrosion environments as temperature, humidity, airborne salt etc.. However, atmospheric corrosion environments can be locally changed depending on structural condition and shape. To estimate the local atmospheric corrosion environments depending on structural member exposed to the marine environment, corrosion level of structural member in steel bridge was examined from exposure tests.

Steel water gate can be vulnerable to corrosion problem, since it is generally contacted with water or maintained with relatively high humidity condition. In this study, to evaluate the level of corrosion damage of water gate, corrosion exposure test was conducted using monitoring steel plate and monitoring sensor in actual steel water gate. From exposure test results, corrosion rate and corrosion environment were examined depending on the height or the structural type of water gate.

This study examined lateral load behaviors of partially grout filled steel tube from structural analysis. To evaluate structural resistant behaviors of partially grout filled steel tube, Nonlinear FE analysis model of partially grout filled steel tube was considered using ABAQUS program. From FE analysis results, grout filling effect and thickness effect of steel tube on the lateral load behaviors were compared.

The maintenance cost is rapidly increasing due to the increased of infrastructures such as railway and port etc., it is necessary management method of facility for measures and extend life. In the case of international infrastructure, in order to asset management to reasonably and effectively, asset management systems were developed for the management of facilities in various countries such as Australia and Canada etc. In this study, to develop the asset management process, the question investigation was conducted on maintenance site personnels for maintenance of the steel structure.

For steel structure, corrosion problem can be a major maintenance area. Even with the same steel structure, corrosion damage can be changed depending on the location and form of thes structural member. In this study, rherefore, In order to evaluate the relative corrosion enviornmnet depending on the installed condition of the structural steel member, the corrosion deterioration environment was monitored for the large-size steel frame structure.

Corrosion durability of steel member can be related to its installed environmental conditions such as relative humidity, rainfall, atmospheric temperature, and air pollution(SO2, chloride). Also its installed environmental condition may differ depending on the shape of structural member. Therefore, In this study, to evaluate the difference in the corrosion damage according to the installation environment of steel structural members, outdoor exposure test was carried out from attaching unpainted monitoring plate and atmospheric corrosion monitoring sensor for actual steel bridge with various structural detail.

This study examined structural behaviors of grout filled composite steel tube member, since grout-filled steel tube can improve its structural load resistance from enhancing strength, stiffness, and confining effect. To evaluated the effect of grout filling in the steel tube on its structural behaviors and strength, grout-filled steel tube specimens were fabricated and lateral loading tests were conducted. From lateral loading tests, their lateral loading resistance and stiffness were examined.

Steel structures have been prevented from corrosion damage using by paint coating. The durability of paint coating can be changed by installed environment condition of steel structures. In this study, thus, deterioration test of paint coating was conducted for various environmental condition. Deterioration levels of paint coating specimens exposed by each artificial environment were examined from visual inspection.

Recently, steel has been very frequently chosen in building many civil infra-structures including bridges due to its several beneficial advantages as compared to concrete structures. However, for the most cases, damage such as section reduction, that is resulted from corrosion, was natural and inevitable. Therefore, it becomes very important to evaluate the structural safety and to estimate the life for the worst cases. In this study, the corrosion behaviors of mock-up specimen with box girder were examined by visual inspection.

Visual inspection has generally been applied to examine the coating deterioration. However, it was difficult to evaluate an anti-corrosion performance of paint film. In this study, thus, to quantitatively evaluate an anti-corrosion performance of paint film under various corrosion enviornent, change in the impedance paint coating was evauated using EIS (Electrochemical Impedance Spectroscopy).

Visual inspection has generally been applied to examine the coating deterioration. However, it was difficult to evaluate an anti-corrosion performance of paint film. In this study, thus, to quantitatively evaluate an anti-corrosion performance of paint film under various corrosion enviornent, change in the impedance paint coating was evauated using EIS (Electrochemical Impedance Spectroscopy).

To properly maintain steel structures, it is important to investigate the corrosivity of structural member. In this study, atmospheric exposure tests were carried out for 1 year using monitoring steel plates (MSP). In addition, atmospheric corrosion environment were also monitored by temperature and humidity sensor, corrosion monitoring (ACM) sensors, etc.

In this study, degradation due to the durability of the coating to reduce the check for to determine the deterioration of the durability coating was in parallel to outdoor exposure test and the salt spray test on the marine environment. weatherability paint coating was electrochemical measured using EIS (Electrochemical Impedance Spectroscopy) to evaluate durability. The purpose of the study was to compare the reduced durability of the paint coating.

In this study, Impedence of bridge paint coating was measured using EIS(Electrochemical Impedance Spectroscopy) to evaluate durability of paint coating depeding on coating thickness. Thus, paint coating specimens with different paint thickness were used. From impedence mesearment, the durability of paint coating was compared.