• 대한토목학회논문집
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• 제26권2B호
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• pp.187-195
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• 2006

본 연구에서는 세굴에 의한 교량기초의 위험도를 평가하고 효율적인 방재 대책수립을 위해 국내 세굴 특성을 고려한 교량 세굴 유지관리 시스템을 개발하였다. 본 시스템은 GIS 기반 프로그램으로서 교량세굴 자료의 저장, 검색 및 출력이 가능하며, 크게 교량세굴 위험도에 따른 우선순위의 결정 및 유지관리 시스템의 두 부분으로 나뉜다. 교량에 대한 기존의 간단한 자료를 이용하여 초기 분류과정을 거쳐 현장 상세조사 우선순위가 결정되며, 이에 따라 현장 상세조사와 세굴 해석을 실시하여 교량세굴 위험도 등급을 결정한다. 위험도 등급은 예상 세굴심과 그에 따른 기초의 지지력 변화, 기초의 종류 및 근입깊이, 현재의 세굴 진행상태 등을 고려하여 모두 6등급으로 나뉘며 그 결과는 화면상에 표시되고 모든 자료는 데이터베이스 시스템에 저장되어 관리된다.

• 대한토목학회논문집
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• 제26권2B호
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• pp.197-208
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• 2006

본 연구에서는 기개발된 교량세굴 유지관리 시스템의 현장 적용성을 검증하기 위하여 실제 교량현장에 대한 사례연구를 실시하였다. 사례연구는 강릉국도 관내의 20개 교량을 대상으로 지반조사를 포함한 현장조사, 설계 홍수량에 대한 교량세굴의 해석, 그에 따른 교량기초의 지지력 평가 및 위험도 등급 결정 그리고 교량세굴 유지관리 체계에 대한 종합적인 평가 등의 절차에 의해 진행되었다. 교량세굴 유지관리 시스템은 사례연구를 통해 세굴로 인한 교량기초의 위험도를 정량적으로 평가할 수 있는 유용한 시스템임이 검증되었으며, 효율적인 방재대책을 수립하고 홍수 시 교량의 안전을 확보할 수 있는 합리적이고 체계적인 시스템으로 제안된다.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.473-476
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• 2008

국내에는 2만개이상의 크고 작은 교량이 있으며, 매년 그 수가 늘어나고 있다. 현재는 이 중 일부 특수 교량에 상시 감시가 가능한 유지관리 모니터링 시스템을 구축하여 전문적으로 관리하고 있으나 앞으로 그 범위가 크게 확대 될 전망이다. 이런 교량 상시 유지관리 시스템의 기본 계측항목 중 경간 중앙부 처짐은 교량의 전체 안전 상태를 파악할 수 있는 중요한 계측항목이다. 본 연구는 지금까지 교량 상시 유지관리 시스템에 적용된 경간 중앙부 처짐에 대한 관리기준치 설정방법을 조사하고 간단한 실내 구조실험을 통하여 현재 적용 중인 교량 경간 중앙부 처짐에 대한 관리기준치의 여유도를 추정하여 보았다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1720-1721
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• 2007

This paper presents a Fuzzy+PID control method for a Bridge Inspection Robot(BIR) system. The BIR has been developed with the aim of checking the safety status of a real bridge, gathering accurate data and performing maintenance. The developed robot system is composed of the specially designed car for bridge inspection, the guide rail and the inspection robot. The proposed Fuzzy+PID controllers are used to track speed reference signal of X axis and position reference signal of Z axis. Experimental results verify that the proposed Fuzz+PID control design method can achieve favorable control performance with regard to external disturbance.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.618-625
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• 2003

The recent development of PSC girder bridges are mostly dedicated for optimization of self-weight, simplification of girder section for easy construction and minimization of maintenance efforts. Moreover some of those bridges are required as a landmark facility which raises the image of locality and harmony with surroundings. An extradosed bridge is one of the best alternates which not only covers the longer span than PSC box girder and also performs the role of landmark facility with much cheaper cost than cable stayed bridge. Hyundai is carrying out the construction of unique style extradosed bridge which have central suspension system and uniform girder depth named Keong-An grand bridge on the Sungnam-Janghowon Express highway. In this paper, major process of design and construction features of Keong-An bridge is presented.

• 한국철도학회논문집
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• 제10권1호
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• pp.22-28
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• 2007

During the passage of the train, the railway bridge undergoes vibration and noise. The noise of railway bridge can be occurred from various sources. The wheel-rail contact, noise from machinery parts, structural-borne noise, pantagraph noise and aerodynamic noise of the train work in combination. Running train is one of the most important factors for railway bridge vibration. The repeated forces with equidistant axles cause the magnification of dynamic responses which relates with maintenance of the track structure and structure-borne noises. The noise problem is one of the most important issues in services of light rail transit system which usually passes through towns. In the present study, The vibration and noise of the LRT bridge will be investigated with utilizing dynamics responses from moving train as input data for noise analysis.

• 한국구조물진단유지관리공학회 논문집
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• 제15권3호
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• pp.163-170
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• 2011

본 연구에서 교량바닥판용으로 조립식(Modular) 유리섬유 보강(GFRP) 바닥판의 개념을 제안하였다. 본 조립식 GFRP 바닥판시스템은 GFRP 주 단위모률(unite module)과 연결 단위모듈로 구성되어 있다. 본 GFRP 바닥판의 구조성능을 평가하기 위해 정적하중실험을 실시하였다. 그리고 구조성능 결과에 대해서 범용 유한요소 프로그램인 LUSAS을 이용한 수치해석 결과와 비교 분석하였다. 본 연구에서 제안한 조립식 GFRP 바닥판은 교량적용에 매우 유용할 수 있음을 확인할 수 있었다. 제안된 GFRP 바닥판의 파괴모드가 개발된 다른 상용화된 GFRP 바닥판의 파괴모드와 매우 유사한 파괴모들 나타내었다.

• Computers and Concrete
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• 제14권6호
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• pp.727-743
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• 2014

The management of existing concrete bridges has become a major social concern in many developed countries due to the large number of bridges exhibiting signs of significant deterioration. This problem has increased the demand for effective maintenance and renewal planning. In order to implement an appropriate management procedure for a structure, a wide array of corrective strategies must be evaluated with respect to not only the condition state of each defect but also safety, economy and sustainability. This paper describes a new performance evaluation system for existing concrete bridges. The system evaluates performance based on load carrying capability and durability from the results of a visual inspection and specification data, and describes the necessity of maintenance. It categorizes all girders and slabs as either unsafe, severe deterioration, moderate deterioration, mild deterioration, or safe. The technique employs an expert system with an appropriate knowledge base in the evaluation. A characteristic feature of the system is the use of neural networks to evaluate the performance and facilitate refinement of the knowledge base. The neural network proposed in the present study has the capability to prevent an inference process and knowledge base from becoming a black box. It is very important that the system is capable of detailing how the performance is calculated since the road network represents a huge investment. The effectiveness of the neural network and machine learning method is verified by comparing diagnostic results by bridge experts.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2015년도 춘계 종합학술대회 논문집
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• pp.15-16
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• 2015

Measuring sensor, equipment, ICT facilities and their software have relatively short life time comparing to constructional structure so that we should exchange or fix them continuously in the process of maintenance and management. In this paper, we propose a novel design of integrated maintenance, management, and measuring monitoring system applying the concept of mobile cloud. For the sake of disaster prevention for constructional structures such as bridge, tunnel, and other traditional buildings in the village of local heritage, we analyze status of these structures in the long term or short term period as well as disaster situations. Collecting data based on mobile cloud and analyzing future expectations based on probabilistic and statistical techniques, we implement our integrated monitoring system for constructional structures to solve these existing problems. Final results of this design and implementation are basically applied to the monitoring system for more than 10,000 structures spread over national land in Korea. In addition, we can specifically apply the monitoring system presented here to a bridge of timber structure in Asan Oeam Village and a traditional house in Andong Hahoe Village to watch them from possible disasters. Total procedure of system design and implementation as well as development of the platform LinkSaaS and application services of monitoring functions implemented on the platform. We prove a good performance of our system by fulfilling TTA authentication test, web accommodation test, and operation test using real measuring data.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.436-442
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• 2011

It is increasing construction of long span railway bridge with concrete track system for speed up of railway and efficient maintenance of track. As the sleeper of the concrete track system layed on a bridge is fixed on deck of the bridge, the displacement of the sleeper and deck is same. Therefore, the spacing between two sleeper installed at the end of the adjacent deck near the expansion joint of bridge becomes vary according to the longitudinal expansion of a deck by temperature change. By the way, if the spacing of sleepers become increase excessively, it causes large bending stress of in a rail, and it can leads failure or reduction of fatigue life of the rail. And also the excessive displacement of the rail may induce decrease ride comfort. Therefore, in order to prevent such problems, the allowable maximum sleeper spacing at a bridge expansion joint was mutually determined. And, the determination procedure of the maximum bridge expansion length based on the allowable sleeper spacing was suggested.