• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2011년도 학술발표회
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• pp.337-340
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• 2011

In this study, qualitative and quantitative evaluations are performed using the hydraulic analysis of fiber stone for bridge pier scour protection. We can consider that the effective scour protection should be suggested from the side of hydraulic stability, structure stability, and permissible tractive force. The perfect verification, however, on the fiber stone for bridge pier scour protection is not sufficient because of short literatures and experiments on the field study. The continuous research, therefore, will be needed to establish reliable verification using literatures investigation and the various experiments on the fiber stone for bridge pier scour protection.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2006년도 학술발표회 논문집
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• pp.598-602
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• 2006

Local scour is associate with particular local types of vortex around bridge piers. This paper is method of protection local scour for the existing Busan City subway 3 Line bridge piers and Gupo large bridge piers. In order to take design of protection of local scour this bridge piers, We calculate the local scour hole of depth , scour width, riprap construction , filter construction by formulas. We had experimental hydraulic model test for this bridge piers in order to take proof for the calculation of local scour. We knew that the vortex intensifies the local flow velocities and acts to erode sediment from the scour hole and transport it downstream. As the result of hydraulic model test, we could suggest three types method of protection local scour this bridges. We knew that FHWA HEC-18(Richardson et al. 2001: Modified CSU) Formula is useful to checking calculation as application of field. One is pier protection using the sheet piles and riprap, the others are pier protection using the riprap with filter and to make renew Wall-caisson. The best method of protection for the existing Busan City subway 3 Line bridge piers and Gupo large bridge piers is pier protection using the sheet piles and riprap.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 기초기술위원회 워크샵
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• pp.168-187
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• 2002

Scour is the physical or chemical attack of flowing water which excavates and carries away material from stream beds and banks. Especially, hydraulic structures such as bridge piers and abutments placed in the channel causes the changes of the flow pattern like acceleration, the formation of vortices, and scour around the structures. Channel scour, especially bridge pier scour is the leading cause of bridge failures. It is very important to apply appropriate methods for both of scour analysis and protection. In this paper, several methods world-widely used for bridge scour analysis and protection are introduced and compared.

• Journal of Advanced Marine Engineering and Technology
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• 제38권10호
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• pp.1206-1211
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• 2014

This study has been conducted to confirm the effect of sacrificial anode cathodic protection system for 90 days to protect corrosion on pier that is located in Korea. The cathodically protected structure was a slab and a pile cap. Before the construction of cathodic protection system, the macrography was carried out. As a result of the macrography, many corrosion traces were confirmed in this structure. The trace was mainly focused on joint and zones that concrete cover was eliminated. To apply the cathodic protection system, many onsite techniques have been adopted. In addition, to confirm the inner state of steel in concrete properly, a corrosion monitoring sensor (DMS-100, Conclinic Co. Ltd) has been applied. Test factors were corrosion & cathodic protection potential, 4 hour depolarization potential, resistivity and current density. After 90 days from the installation of cathodic protection system, it could confirm that proper corrosion protection effect was obtained by considering the result of tests.

• 한국해안·해양공학회논문집
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• 제20권2호
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• pp.203-211
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• 2008

최근 들어 선박의 항로에 위치하고 있는 대형 해상교량의 건설이 활발해짐에 따라 선박충돌의 위험성을 고려하여 교각 주변에 충돌방지공을 설치하는 경우가 많다. 이러한 충돌방지공 설치로 인해 교각의 세굴특성은 충돌방지공 설치 전의 교각 주변의 세굴양상과 매우 다르게 나타난다. 따라서 본 연구에서는 충돌방지공의 설치 유무에 따른 세굴의 형태를 분석하기 위해 인천대교를 대상으로 수리모형실험을 실시하였다. 충돌방지공 설치 전의 고정상, 이동상실험을 통해 유황과 세굴심 및 세굴공 범위를 파악하였으며 또한 충돌방지공 설치 후 실험을 통하여 최종적으로 충돌방지공으로 인한 교각 세굴 특성 변화를 분석하였다. 실험결과, 충돌방지공이 설치됨으로 인해 최대세굴심이 W1교각의 경우 약 0.24 m, W2+3+4교각의 경우 2.4 m 증가하는 것으로 나타났다. 또한 최대세굴심의 발생위치는 W1교각의 경우 충돌방지공 설치 전 후가 동일한 위치에서 발생하였으나 W2+3+4교각의 경우 설치 후 최대세굴심이 교각주변이 아닌 충돌방지공 주변에서 발생하였다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회(1)
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• pp.4-5
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• 2005

• Steel and Composite Structures
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• 제50권2호
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• pp.217-235
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• 2024

Concrete-filled steel tubes (CFSTs) nowadays are widely used as the main parts of momentous structures, and its connection has gained increasing attention as the complexity in configuration and load transfer mechanism. This paper proposes a novel CFST pier-to-footing incorporating tube-confined RC encasement. Such an innovative approach offers several benefits, including expedited on-site assembly, effective confinement, and collision resistance and corrosion resistance. The seismic behavior of such CFST pier-to-footing connection was studied by testing eight specimens under quasi-static cyclic lateral load. In the experimental research, the influences on the seismic behavior and the order of plastic hinge formation were discussed in detail by changing the footing height, axial compression ratio, number and length of anchored bars, and type of confining tube. All the specimens showed sufficient ductility and energy dissipation, without significant strength degradation. There is no obvious failure in the confined footing, while local buckling can be found in the critical section of the pier. It suggests that the footing provides satisfactory strength protection for the connection.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 추계학술대회 초록집
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• pp.169.2-169.2
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• 2010

Recently, the massive offshore bridges in a ship passage have been constructed on the sea. Therefore, the ship impact protection for the bridge-piers are installed to consider the possibility of vessel collision danger. Due to the ship impact protection, the flow-field characteristics are changed in comparison with the condition without the ship impact protection. Especially, the fluid velocity between the pier and the ship impact protection is possible to increase due to the contraction of the cross sectional area of flow. In this study, the tidal energy magnitude around the ship impact protection of Incheon bridge is assessed by simulating the flow-field by using FLOW-3D software.

• 한국해안해양공학회:학술대회논문집
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• 한국해안해양공학회 2004년도 학술발표논문집 Proceedings of Coastal and Ocean Engineering in Korea
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• pp.350-355
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• 2004

• 한국수자원학회논문집
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• 제31권3호
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• pp.269-277
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• 1998

본 연구에서는 수리실험을 실시하여 만곡부의 흐름특성과 만곡부에서의 교각 주위 국부세굴형상, 최대 국부세굴심 등을 분석하였다. 또한, 기존의 세굴보호공법 중 원환에 의한 보호공법을 만곡부에 적용하여 세굴감소효과를 분석하였다. 180' 만곡수로에 대해 이동상 실험결과 본 실험조건에서는 최대 횡방향 하상경사가 150' 단면에서 발생하였으며, 원환에 의한 세굴감소효과는 유로 직선부에서 최대 40%, 만곡부에서는 150' 단면 외측의 경우 최대 44%의 감소효과를 보였다. 폭이 교각폭에 2배인 원환에 대하여 실험한 결과, 유로 직선부에서는 원환을 .02h(여기서 h는 수심)만큼 하상저면에 설치하였을 때 가장 효과적이었으며, 유로 만곡부에서는 0.1h 만큼 하상저면에 설치하였을 때 가장 효과적이었다.