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해양구조물 원통구조의 충돌강도와 잔류강도 : Collision Resistance and Residual Strength of Offshore Cylindrical Members 원문보기

  • 저자

    세릭 부락 칸

  • 학위수여기관

    울산대학교

  • 학위구분

    국내박사

  • 학과

    조선및해양공학과 조선공학전공

  • 지도교수

    신현경,조상래

  • 발행년도

    2014

  • 총페이지

  • 키워드

    Offshore+Cylindrical member+collision+impact;

  • 언어

    eng

  • 원문 URL

    http://www.riss.kr/link?id=T13540500&outLink=K  

  • 초록

    Collisions against offshore based installations have been identified as one of the major hazards considering potential consequences may vary from minor structural damages to major damages where the structural integrity is threatened, production downtime, pollutions and cost associated with repairs. The present thesis deals with the structural behavior of offshore structural components subjected to accidental loads arising from collision. The focus is given on impact response of tubular members and stiffened cylindrical shell columns, as well as residual strength of the latter in damaged condition. Relevant experimental data of small-scale, steel, welded offshore structural components is compiled. Additional tests are performed on two ring-stiffened cylinder models which can be useful for future benchmarking of numerical and simplified prediction methods for impact response of similar structures. The experiments are described in detail including the test conditions, exact material properties and the method to track impact response. Numerical models are developed and comparative analysis of experiments is conducted. The credibility of numerical assessment of impact response is discussed. Among others, focus is given on the influence of modeling dynamic material properties and experimental impact conditions. Impact response, various energy dissipation modes and deformation behavior are assessed based on the detailed results obtained through numerical analysis. The most important data utilized is force-displacement curve. The mode of response of the offshore structural components in case of a low velocity impact is found similar to the mode corresponding static force-displacement curve. Further analyses covering various cases and conditions are performed and general findings are summarized. Existing methods of simple in literature procedures providing force-displacement response are re-visited. Impact response of tubulars is classified and improvements are made based on the methods which describe each energy dissipation mode independently. For the case of stiffened cylinders, the effect of stiffening is included in a simplified manner by smearing the stiffeners. Comparison with test and numerical results are encouraging. Using the simple procedures, insights for accidental limit state design are provided allowing either moderate deformation or keeping the struck structure intact. Finally, post-damage behavior of stiffened cylinders is investigated. A methodology for residual strength assessment of these structures is developed and checked against axial compression test results taken from the literature. Further investigations are made on the design examples. Based on the numerical results simple formulas are derived for quick estimation of residual strength under various loading conditions.


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