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A study on the optimal configuration of harbor structure under the combined loads
조규남 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.32 No.3
Response of harbor structure to environmental loads such as wave load, impact load, ship’s contacting load, is a fundamental factor in designing of the structure’s optimal configuration. In this paper, typical environmental loads against coastal structures are investigated for designing of the optimal harbor structure. Loads to be considered here are wave load, impact load and contacting load due to ship mooring. Statistical analysis for several harbor structure types under the corresponding loads is carried out, followed by investigation of effect of individual environmental load. Based on these, the optimal configuration for the harbor structure is obtained after considerable engineering process. Estimation of contacting load of the ship is suggested using effective energy concepts for the load, and analysis of structural behavior is done for the optimal designing of the structure in the particular load. A guideline for the design process of the harbor structure is established, and safety of the structure is examined by proposed scheme. For verification of the analytical approach, various steel-piled coastal structures and caissons are chosen and relevant structural analyses are carried out using the Finite Element Methods combined with MIDAS/GTS and ANSYS code. It is found using the Morison equation that impact load cannot be a major load in the typical harbor structure compared with the original wave load, and that configuration shape of the structure may play an important role in consideration of the response criteria.
曺圭楠,尹載畯 홍익대학교 산업기술연구소 1996 産業技術 Vol.6 No.-
The characteristics of breaking wave force are studied and the corresponding estimation procedure for them are proposed. Among drag force and inertia force and impact force, the impact force is mainly studied with the change of relevant parameters and the example calculation of the force is presented with the application scheme for the design of offshore circular structure member. The impact force is determined based on the main design parameters changes and the relevant wave theories applied. The drag force and inertia force are represented as conventionally for the profile. In the numerical example, for typical sea condition and the member size, the proposed procedures for the breaking wave forces calculation with different wave theories are demonstrated. It is found that the impact force is the most dominant one comparing with inertia and drag forces in the surf zone, and the force is strongly dependent of the applied wave theories. Numerical results show that the impact force value based on the nonlinear wave theory is more conservative in the design of offshore structures.
曺圭楠 홍익대학교 산업기술연구소 1997 産業技術 Vol.7 No.-
The current work develops an analysis scheme for the modal analysis of dynamic behaviors of offshore structures with many degrees of freedom. The basis of the proposed scheme is the application of the mass perturbation concepts associated with natural frequencies and mode shapes and mass matrix of the given structures. The mass perturbation value gives the guideline for selecting of necessary mode shapes in carrying out the modal analysis. The mathematical formulation of the mass perturbation method is described. New solution procedures for the typical structural problems are demonstrated. The solution procedure presented herein is compact and computationally much simpler. Example problems, which demonstrate the effectiveness of the new procedures, are followed.
용접이음부의 피로강도 해석을 위한 수치해석과 실험과의 비교연구
조규남,하우일 한국전산구조공학회 1993 전산구조공학 Vol.6 No.3
대부분의 선체 및 해양구조물은 용접을 통해서 만들어지며 이러한 구조물들은 항상 변화되는 하중에 노출된다. 본 논문에서는 T형 용접이음부의 응력집중과 피로특성규명을 위하여 수치해석적 방법을 통한 연구결과를 실험결과와 비교 검토하였다. 특히 필렛용접, 완전 용입용접, 부분 용입용접부의 특성을 응력집중과 피로강도면에서 연구하여ㅛ으며 이를 위한 파라메터로는 불 용입부의 길이, 각장의 크기 및 형태, 삽입판의 각도등을 채택하였다. 최적의 용접을 위하여 각 파라메터의 선정을 효과적으로 할 수 있도록 응력 및 피로수명분표, S-N선도를 정리하엿으며 필렛용접이 용입용접을 대신하여 사용될 수 있는 근거를 제시하였다. 본 연구결과는 실제 현장에서 구조의 용접이음부 형태 선정에 지침이 될 수 있다. Most of the ship structures and offshore structures are constructed through the welding and they are always subjected to variable loads. In this study, fatigue and stress concentration of the various types of welding connections due to the variable loads are investigated by using numerical approach, and comparisons between numerical analysis and experiments are performed. Fillet weld, full penetration weld and partial penetration weld characteristics are studied by using parameters such as penetration length, welding leg length, size and penetration angle. Based on this study, it is suggested that the fillet welding can be replaced with the penetration welding in some cases. The results of this study can be used as guidelines for actual welding problems in the shipyards.