• 한국해양공학회지
• /
• 제11권3호
• /
• pp.8-19
• /
• 1997

In this study an adequate type of offshore structure at the Sakhalin region as cold region is proposed and its structural design results are presented based on the reliability analysis. Structural safety assessment has been carried out for the proposed offshore structure at the Sakhalin area as designed by the reliability method. And a rational design procedure is presented based on the reliability analysis. Followings are drawn through the present study : - Four colum TLP structure is proposed as an adequate offshore structure type at the cold region like the Sakhalin region and the reliability-based structural design results are presented. It is seen that the proposed type is a more adequate and economic than the fixed type. - Safety assessment of the proposed structure applying the extended incremental load method is performed. - Referring the allowable safety level for offshore structures it has been found present TLP structure has sufficient structural safety at the system level as well as at the component level.

• 전산구조공학
• /
• 제2권4호
• /
• pp.89-98
• /
• 1989

구조해석에 사용되는 변수들이 갖고 있는 통계적 특성을 고려하기 위해 기존의 방법에서는 경험에 입각한 안전계수를 사용하여, 변수가 갖고 있는 불확실성을 정성적으로 취급하여 구조물의 안전성을 점검하여 왔다. 그러나, 최근 확률이론에 입각한 신뢰성이론을 적용하여 구조물의 안전성을 보다 정량적으로 파악하여 충분한 경험과 실적이 부족한 새로운 형태의 구조물의 안전성 점검에도 활용하려는 시도가 많이 이루어지고 있다. 이러한 추세에 따라, 본 연구에서는 기존의 유한요소법에 확률론적 수법을 가미한 확률 유한요소법을 개발하여, 구조해석에 사용되는 변수들이 갖고 있는 불확실량들이 구조해석의 최종결과에 어떤 영향을 미치는가를 확률적으로 처리하여, 구조물의 안전성을 보다 합리적으로 평가하도록 하였다.

• 한국산업안전학회:학술대회논문집
• /
• 한국안전학회 1997년도 추계 학술논문발표회 논문집
• /
• pp.151-156
• /
• 1997

In this thesis, the safety assessment of the steel box girder bridge were studied. From the structural analysis results of the steel box girder bridge, bending moment and shear force were calculated, and these element force was applied to the safety assessment of the steel box girder bridge.

• Computers and Concrete
• /
• 제2권1호
• /
• pp.31-53
• /
• 2005

In the present structural codes the safety verification is based on a linear analysis of the structure and the satisfaction of ultimate and serviceability limit states, using a semi-probabilistic security format through the consideration of partial safety factors, which affect the action values and the characteristic values of the material properties. In this context, if a non-linear structural analysis is wanted a difficulty arises, because the global safety coefficient, which could be obtained in a straightforward way from the non-linear analysis, is not directly relatable to the different safety coefficient values usually used for the different materials, as is the case for reinforced concrete structures. The work here presented aims to overcome this difficulty by proposing a methodology that generalises the format of safety verification based on partial safety factors, well established in structural codes within the scope of linear analysis, for cases where non-linear analysis is needed. The methodology preserves the principal assumptions made in the codes as well as a reasonable simplicity in its use, including a realistic definition of the material properties and the structural behaviour, and it is based on the evaluation of a global safety coefficient. Some examples are presented aiming to clarify and synthesise all the options that were taken in the application of the proposed methodology, namely how to transpose the force distributions obtained with a non-linear analysis into design force distributions. One of the most important features of the proposed methodology, the ability for comparing the simplified procedures for second order effects evaluation prescribed in the structural codes, is also presented in a simple and systematic way. The potential of the methodology for the development and assessment of alternative and more accurate procedures to those already established in codes of practice, where non-linear effects must be considered, is also indicated.

• 한국전산구조공학회:학술대회논문집
• /
• 한국전산구조공학회 2010년도 정기 학술대회
• /
• pp.122-125
• /
• 2010

본 논문에서는 부유식 원유저장 해양구조물(FSU; Floating Storage Unit)의 상부 하역구역(Laydown Area) 내에 낙하물(Dropped Object)이 떨어질 경우의 충격 구조 안전성 평가(Structural Safety Assessment)를 수행하여 표준해석 절차서를 정립하고자 한다. 이를 위해서는 내충격 구조해석을 통한 평가 기법을 개발하고 그 기법의 적용성을 검토하여 표준해석 절차서를 정립하는 것이 필요하다. 현재는 충격 구조해석 시나리오를 작성하고 내충격 구조해석을 수행하여 설계기준(design criterion)에 적용하고 있는 중간단계로써 그 결과들을 소개하고자 한다.

• 한국전산구조공학회:학술대회논문집
• /
• 한국전산구조공학회 2004년도 봄 학술발표회 논문집
• /
• pp.267-274
• /
• 2004

Since there is a large variation in measurements of the thickness of corroded elements, the thickness of corroded elements are considered as imprecise elements. There is also a considerable degree of uncertainty in a visual assessment of thickness loss. The remaining thickness of a severly corroded element may be represented by an imprecise which expresses the range over which there is uncertainty about the thickness. Therefore, the objective of this paper is to propose a new methodology to safety assessment using imprecise reliability into conventional safety assessment frameworks. For this purpose, this study presents a safety assessment model using Imprecise reliability for large civil structures and demonstrates the applicability of the approach to cable-stayed bridge projects.

• 한국전산구조공학회:학술대회논문집
• /
• 한국전산구조공학회 2004년도 가을 학술발표회 논문집
• /
• pp.245-253
• /
• 2004

There has been recent demand for extending the life of age-degraded structures and equipment by such techniques as diagnosis, maintenance, safety assessment, and estimating residual life on iron-making plants and hydraulic, thermal, and nuclear power plants. These techniques take into account comprehensive scenarios that may cause malfunction and structural damage and allow an assessment of risk based on the likely scenarios. In particular the safety assessment and residual life estimation of age-degraded ships and equipment facilities require consideration of various factors such as mechanical and thermal stresses, corrosion, hardness, load variation due to changes of operating condition, crack generation and strength reduction of material by fatigue. In this study, a detail thermal stress analysis, one of useful techniques of safety assessment and maintenance, is performed on a blast furnace by using general FEM code (MSC/NASTRAN).

• Journal of the Korean Wood Science and Technology
• /
• 제31권2호
• /
• pp.58-68
• /
• 2003

목조 고건축물의 안전성 평가를 위해서는 먼저 부재의 성능평가가 선행되어야 한다. 지금까지의 목재 부재의 성능평가는 육안에 의한 경험적 방법에 의존하였다. 하지만 과학적이고 합리적인 비파괴 방법을 적용하여 구조부재의 성능을 평가할 수 있다면 구조물의 안전성 해석은 더욱 정확해지고 합리적이 될 것이다. 이를 위해 본 연구에서는 목조 고건축물의 여러 구조 부재 중 기둥에 대해 비파괴 평가법을 적용하여 구조부재의 성능 평가에 대한 가능성을 알아보았다. 이 결과를 이어지는 연구에서 구조물의 안전성 해석의 기초자료로 사용할 예정이다. 특별히 기둥의 노출 환경에 따른 열화의 진행정도를 비파괴 평가법으로 측정하였다. 그 결과 실제 육안에 의한 열화의 관찰과 유사한 결과를 나타내어 비파괴 방법의 적용 가능성을 보여주었다.

• 한국해양공학회:학술대회논문집
• /
• 한국해양공학회 2001년도 춘계학술대회 논문집
• /
• pp.133-138
• /
• 2001

Formal safety assessment (FSA) is defined as a structured and systematic methodology aimed at enhancing maritime safety including protection of life, health, and the marine environment and property, by using risk and cost/benefit assessment or, more specifically, it is a process of identifying hazard, evaluating risk and deciding on course of action to control those risks. Emphasis is placed on the structural aspect of the failure of cargo hold. This study is expected to illustrate how a new methodology, i.e. the Formal Safety Assessment, can be applied to specific ship safety problems.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2004년도 춘계학술대회 논문집
• /
• pp.322-327
• /
• 2004

This paper describes the structural analysis result of accident EMU(Electric Multiple Units). Structural analysis of EMU was performed for the criteria of safety assessment. Structural analysis using commercial I-DEAS software provided important information on the stress distribution and load transfer mechanisms as well as the amount of damages during rolling stock crash. Tensile tests were performed on two different types of specimens in order to evaluate the strength changes before and after damages, obtained from plastic deformed area and nondeformed region of the accident EMU. The structural analysis and tensile test results have been used to provide the critical information for the criteria of safety assessment.