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A Study on the Design of a Breakwater for Very Large Floating Structure
曺圭楠 弘益大學校 産業技術硏究所 2005 産業技術 Vol.15 No.-
부유식 해양구조물의 장점을 살리면서 작업성 및 안전성을 향상 시키고 주변해역의 건전한 환경보존을 기할 수 있는 적극적 대책으로, 부유구조물이 설치되는 해역의 환경적 특성의 제어를 통하여 초대형 해양구조물의 동적 거동을 기준 허용치 이하로 완화시키는 해역정온화 방법으로 고정식 방파제를 설계할 필요가 있다. 고정식 방파제에 대한 개념설계를 수행하여 구조역학적 제원을 체계화시키고 개념설계를 통한 프로트 타잎의 방파제 모델을 제시한다.
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.