• Journal of the Korea Concrete Institute
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• v.18 no.6 s.96
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• pp.711-720
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• 2006

The structural behavior of concrete girder in bridges constructed by free cantilever method is time-dependent due to creep and shrinkage of concrete. The constraint effects of longitudinal movement of concrete girders can introduce unfavourable moment into piers. This study is aimed at proposing a method to reduce the moment of piers in bridge constructed by free cantilever method. The method are systematically composed of time-dependent structural analysis of bridges and loading of control force during construction of bridge. Numerical analyses are carried out depending on the parameters such as amount of control force and flexibility of pier. Time-dependent structural behavior shows that moment of pier increases according as pier height decreases. Also, moment of pier decreases when control method are applied. Numerical result of the study represents that time-dependent moment of piers can be controlled effectively by employing the proposed method.

• Journal of the Korean Society of Hazard Mitigation
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• v.8 no.4
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• pp.9-16
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• 2008

Ubiquitous technology is proposed which is used wireless sensor network for deflection management at casting and after casting of FCM bridge. Proposed method are analyzed which are sensor experiment and existing FCM bridge using ubiquitous sensor network. Wireless sensor network enables low-cost sensing of environment. As a results, the field application shows that USN is useful method for structural health monitoring system which long distance away.

• Journal of the Korean Society of Marine Environment & Safety
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• v.15 no.1
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• pp.25-32
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• 2009

The burial method has been generally used for the protection methods of submarine cable. Especially in Korea, various types of protection methods have been used according to fisheries and fishing implements. In these days, all the protection methods - burial, continuous concrete mattress, cast iron pipes, U-duct, concrete bags, rock berm, mortar bags and FCM(Flexible Concrete Mattress) are applied to the submarine cable, but these methods just focus not on the characteristics of ocean environment and the protection of environment but on the safety of submarine cable against the external damages. This research presents the protection methods of submarine cable according as the characteristics of ocean environment - external damages, depth of water, seabed condition and the protection of environment.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2003.05a
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• pp.487-490
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• 2003

국가의 사회간접자본 시설확충 정책에 따라 교량공사의 건수는 계속 증가되어 오고있다. 교량공사는 수상공사, 육상공사로 나뉘고 다시 우물통기초, 교각, 상판공사로 분류될 수 있는데 상판공사 스틸박스거더, 콘크리트 박스거더 위에 설치되므로 물위에서 또는 땅 위에서의 높이가 수십m에 이르게 되어 추락했을 때 특히 위험하고 상판을 FCM공법으로 물위의 수십m 위에서 진행되는 경우가 대부분이다.(중략)

• Proceedings of KOSOMES biannual meeting
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• 2007.05a
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• pp.51-56
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• 2007

It has generally used the burial method for the protection methods of submarine cable. Especially in Korea, It has used the protection methods of various types according to fisheries and fishing implements. Present day, All the protection methods-burial, continuous concrete mattress, cast iron pipes, U-duct, concrete bags, Rock Berm, mortar bags, FCM apply to the submarine cable, but these methods just focus on the safety of submarine cable against the external damages not the characteristics of ocean environment and the protection of environment. This research is going to present the protection methods of submarine cable according as the characteristics of ocean environment-external damages, depth of water, seabed condition, wave power and the protection of environment.

• Magazine of the Korea Concrete Institute
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• v.4 no.3
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• pp.11-18
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• 1992

• Magazine of the Korea Concrete Institute
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• v.4 no.3
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• pp.5-10
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• 1992

• Magazine of the Korea Concrete Institute
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• v.12 no.3
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• pp.85-91
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• 2000

• 한국방재학회:학술대회논문집
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• 2010.02a
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• pp.41.2-41.2
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• 2010

하천, 해상 등에 위치한 교량 설계시 선박충돌을 방지하기 위해 교각 위치를 변화시킬 필요성이 발생한다. 이 때, 교각 위치에 따른 변단면을 갖는 PSC(Prestressed concrete) 박스거더의 형상 변화를 효과적으로 변경하기 위해 고려해야하는 구속조건을 추출하고 정의하였다. PSC 박스거더는 변단면 시공에 일반적으로 적용되는 FCM(Free cantilever method) 공법이 착용된 교량을 착용했으며, 구속조건 정의를 위해 설계지침서를 분석하여 구속조건으로 작용하는 매개변수를 추출하였다. 정의한 구속조건의 적용성을 검증하기 위해 파라메트릭 모델링을 수행하였으며, 그 결과로 생성된 모델에 대한 물량을 산출하여 대상교량에서 산출된 실제 물량과 비교 분석하였다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.29 no.3
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• pp.219-227
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• 2016

In this study, we have proposed a method of monitoring of bridges under construction in view of the long-term behavior of the prestress concrete bridge of which the Free Cantilever Method is applied. As a method to confirm the ability of the long-term behavior of the concrete box girder, temperature sensors and strain gauges were installed, and the measured data was used to calculate creep coefficient. Moreover, we have measured the stress of the concrete box girder during construction which was applied with creep coefficient and compared with the changes in temperature to analyze the vertical displacement along the segment. In conclusion, monitoring of the FCM bridge during construction in consideration of the long-term behavior can be analyzed efficiently by suing temperature and displacement data without the use of laser displacement meter or laser delfectometer.