• Title, Summary, Keyword: 파랑하중

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Structural Analysis of a Breakwater in Wave and Seismic Loads (파랑하중과 지진하중하의 방파제 구조해석)

  • Cho, Kyu-Nam
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.22 no.1
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    • pp.45-52
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    • 2009
  • In this paper, a guideline for designing breakwater in wave loads and in seismic loads is proposed. A simple model structure in breaking wave zone is examined using Morison equation in consideration with the effect of an impact load, for evaluation of the wave loads. As the impact load effect is not significant, pressure distributions according to Goda are applied for evaluation of wave loads on breakwater. Structural behavior of breakwater in wave loads can be obtained using the Goda method, as well. For seismic analysis, Ofunato and Hachinohe models, as well as an artificial seismic acceleration loads model, are adopted. Soil-structure interaction analysis is carried out to find the seismic load effect. It is found that, in certain cases, structural deformation in wave loads is in the same level as deformation that in seismic loads. Thus, it is our recommendation that these two loads are considered at the same level in breakwater design.

파랑하중을 받는 플로팅 모듈러 구조물의 해석

  • Song, Hwa-Cheol;Kim, Se-Cheol
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.122-124
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    • 2011
  • 해양 플랜트의 관심의 증가로 사업의 수요가 많아지고 플랜트 사업이 상부구조물로서 경량체인 모듈러시스템을 상부구조물로서 적용된다면, 그에 따른 파랑하중을 적용시킨 모듈러시스템의 구조해석이 필요하다. 이 연구에서는 파랑하중이 모듈러시스템에 끼치는 영향을 알아보기 위해 구조해석 프로그램인 MIDAS를 사용하여 모듈러시스템에 정적하중과 조합하중의 모멘트를 비교 분석한다.

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Simplified Static Analysis of Superstructure on Very Large Floating Structures subjected to Wave Loads (파랑하중을 받는 초대형 부유식 구조물 상부구조체의 실용정적해석법)

  • Song, Hwa-Cheol;Park, Hyo-Seon;Seo, Ji-Hyun
    • Journal of Navigation and Port Research
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    • v.27 no.5
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    • pp.519-526
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    • 2003
  • For preliminary structural analysis of superstructures on very large floating structures(VLFS), superstructures are analyzed considering elastic deformations of barge type lower-structures subjected to wave loads. In this case, to consider the effect of wave loads on the superstructure, initial displacements at the support points of superstructures are evaluated as input data for the analysis. However, the evaluation and application of displacement loads are tedious and very time-consuming processes. Therefore, this paper proposes a simplified static analysis method to analyze the structural behaviors of superstructures on very large floating structures subjected to wave loads. In this study, the member forces due to the variation of beam span and the amplitude and period of wave load are analyzed by using an example 4 span -3 story structure and the amplification factors for beam moments are represented by the specific regression equation.

A Study on the Behaviour Characteristics of the Saemanguem Sea Dyke Coastal Covering Stones by Sea Waves (파랑에 의한 새만금 방조제 해측 피복석 거동특성 연구)

  • Baek, SeungChul;Lee, SoYeol
    • Journal of the Korean Geoenvironmental Society
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    • v.12 no.7
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    • pp.67-76
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    • 2011
  • In this present study, to evaluate a behavior characteristics of the sea dyke coastal covering stone by sea waves. sea waves act on coastal structures as an impact load. During impact loading, erosion and bluff slumping occur in the coastal structures. Also, the covering stone are worn down by wave impact. The sea dyke has been used near coastal region for protection of infra-structure since 1970s in Korea. The sea dyke consist of dredged sand and covering stone mainly. The damage type of covering stone has been reported since 1970s. However, the interaction of impact load by sea wave with the covering stone has not been investigated yet properly. Mainly damage type of covering stone is an abrasion. But the study of covering stone abrasion is not sufficient. Hence, In this study, it was analyzed the interaction of impact load by sea wave and the covering stone during sea wave action on coastal structures. In order to analyze the behavior characteristics of coastal covering stone considering the magnitude and period of impact loading and to evaluate the displacement increment of covering stone during impact load, numerical analysis was carried out considering impact loading by sea wave.

파랑하중을 적용한 3차원 플로팅 구조물 해석

  • Song, Hwa-Cheol;Park, Jong-Seo
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.192-194
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    • 2011
  • 육상의 자원고갈로 인한 해양자원의 관심 증가로 플랜트 사업의 수요가 증가함에 따라 플로팅 구조물의 안전성 확보를 위한 구조해석이 필요하다. 이 연구에서는 범용 유한요소 프로그램인 ABAQUS를 사용하여 3차원 플로팅 구조물의 상부구조물에 정적하중과 진폭의 크기가 다른 파랑하중을 적용하여 모멘트 및 변위를 비교한다.

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플로팅 함체와 상호 거동에 따른 상부 골조의 모멘트 증대효과

  • Lee, Yeong-Uk;Park, Jeong-A;Choe, Ji-Hun;Chae, Ji-Yong
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.198-199
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    • 2011
  • 플로팅 함체는 육상과 달리 지진하중의 영향을 받지 않으며 파랑하중의 영향을 크게 받는다. 파랑하중에 대한 안전성을 확보하기 위하여 범용구조해석 프로그램을 이용하여 해석하였다. 상부구조물의 영향을 확인하기 위하여 함체의 밀도를 변화시켜 상부하중에 대한 함체의 변위 응답을 확인을 한 결과, 밀도에 따른 함체 거동의 변화는 미미하였다. 해석을 통해 얻은 각 주기별 변위를 하중에 적용한 상부구조물의 모멘트 증가비는 파랑하중의 주기가 단주기에서 장주기로 갈수록 감소하는 양상을 보였으며, 축력은 파랑주기의 영향을 적게 받는 것으로 나타났다.

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Nonlinear Analysis of Superstructures on Floating Structures (플로팅 구조물의 상부구조에 대한 비선형해석)

  • Song, Hwa-Cheol;Park, Soo-Yong;Jung, Keun-Hoo;Kim, Se-Cheol;Lee, Eun-Suk
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.118-121
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    • 2010
  • 초대형 플로팅 구조물의 상부구조는 육상 구조물과는 달리 파랑하중의 영향을 받기 때문에 하부부체의 변형에 의해서 상부구조물에는 부가 모멘트가 크게 발생한다. 이와 같은 부가모멘트의 저감을 위하여 보-기둥 접합부에 반강접의 도입에 관한 연구와 반강접의 비선형 거동을 고려한 상부구조물의 연구는 초기단계이다. 본 연구에서는 초대형 플로팅 구조물의 상부구조물에 정적하중과 진폭의 크기가 다른 파랑하중이 동시에 작용할 경우 강접 골조와 부분적으로 반강접 접합부가 사용된 상부구조체에 대한 1, 2차 소성해석을 수행하였다. 접합부는 웨브에 더블 앵글을 가진 상하 앵글(TSD)접합을 적용하였으며 상부 구조물에 파랑하중이 작용할 경우 소성거동에 따른 응답특성에 대하여 분석하였다.

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A Strength Analysis of the Hull Gilder among the Rough Sea according to Ship Types (대파고 파랑중에서의 선체장도 해석에 관한 연주 - 선종에 따른 강도, 응답특성비교 -)

  • Sa-Soo Kim;Ku-Kyun Shin;Sung-Wan Son;Jae-Hong Kim
    • Journal of the Society of Naval Architects of Korea
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    • v.30 no.4
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    • pp.153-168
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    • 1993
  • The ship sailing among waves suffers from the various wave loads that comes from its motion throughout its life. In the rationally-based design, the dynamic structural analysis is carried out using dynamic wave loads provided from the results of the ship motion calculation as the rigid body. This method is based on the linear theory assumed low wave height and small amplitude of motion. But at the rough sea condition, relatively high wave compared to the height ship's depth is induced the large ship motion, so configuration of the ship section below waterline changes rapidly at each time. This re-sults in a non-linear problem. Considering above situation we have already introduced the non-linear dynamic strength analysis method for the hull girder(refer vol. 29. No.4 November, 1992, Journal of SNAK). In this paper, estimation of the hull girder strength for various ship types such as tankers, containers and log carriers is carried out based on the introduced non-linear method. We expect that the results will be used as useful basic data for the es-timation of dynamic strength of ships in the rough sea.

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Study on Assessment of Displacement by Wave Force for Rubble Mound Breakwater and its Application to Design (파랑하중을 받는 굴착치환 사석경사식 방파제의 침하량 산정과 설계 적용성에 관한 연구)

  • Ahn, Ik-Seong;Park, Sang-Kil
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.20 no.4
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    • pp.413-420
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    • 2008
  • Wave force is an important factor which gives a direct affect to stability of the rubble mound breakwater. Particularly wave force has been considered as the main cause of displacement for replaced rubble mound breakwater which permits a little displacement to some degree. But the effect on displacement by wave force has not been considered and reflected in design. Therefore in this study, we compared numerical analysis displacement with field measured displacement so that the effect of wave force on displacement can be reflected in design. Result of the numerical analysis displacement was well consistent with field measured displacement data.

Effect of Disequilibriating Buoyancy of Wave (파랑하중에 의한 비평형부력의 영향)

  • Park, Young-Hee;Noh, Hyuk-Chun;Kim, Seung-Eock;Na, Seong-Won
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.319-322
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    • 2009
  • 콘크리트 부유구조물에서 파랑하중의 영향에 의하여 발생하는 부재내력 산정식을 제시하였다. 기존의 설계식은 구조물의 길이와 파장 길이가 일치할 때에 적용이 가능하다. 그러나 대부분의 경우 구조물의 길이와 파장 길이가 일치하지 않기 때문에 비평형 부력에 의한 추가적인 모멘트가 발생한다. 따라서 본 연구에서는 부유구조물을 강체로 가정하고 비평형 부력의 영향을 고려한 설계식을 제시하였고 이를 유한요소해석에 의한 결과와 비교하여 그 타당성을 보여주었다.

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