• 융합정보논문지
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• 제10권12호
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• pp.110-118
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• 2020

본 연구에서는 환경시설을 대상으로 침수피해에 대비한 재해 예방능력을 강화하고자 정량적인 부분뿐만 아니라 정성적인 부분을 고려한 홍수취약성 평가지표를 개발하고자 하였다. 이를 위해 환경시설의 침수에 취약한 시설물을 분석하고 구조적, 비구조적인 평가지표로 구분하여 개발하였다. 구조적 평가지표는 환경시설에 취약한 측면을 시설의 유형적인 측면에 대해 11개의 평가지표를 제시하였으며, 비구조적 평가지표는 내부인자와 외부인자로 구분하여 시설의 운영·상태 등 무형적인 측면에 대해 내부인자 8개와 외부인자 6개로 제시하였다. 본 연구에서 제시한 홍수취약성 평가지표는 기존 환경시설물의 침수피해 대비 홍수취약성에 대해 평가할 수 있도록 함으로써 홍수에 대한 대비할 수 있을 것으로 기대된다.

• 산업공학
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• 제12권2호
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• pp.247-253
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• 1999

The main objective of this study is to quantify the appropriateness of the sensibility vocabularies used in sensibility ergonomic evaluation scheme by applying structural equation model. In the conventional sensibility ergonomic evaluation scheme, factor analysis is employed to classify various vocabularies into some common factors. However, since the vocabularies were chosen quite subjectively, it is difficult to ascertain that they represent the product attributes properly. It was shown in a case study that the structural equation model provides the quantitative results to verify whether the selected vocabularies are eligible for further steps of sensibility ergonomic evaluation.

• 한국공간구조학회논문집
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• 제24권2호
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• pp.43-52
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• 2024

Phayathonzu temple in Myanmar was made of masonry bricks, and so it was vulnerable to lateral load such as earthquake. Especially, it has many difficulties in structural modeling and dynamic analysis because the discontinuous characteristics of masonry structure should be considered. So, it is necessary to provide the seismic performance evaluation technology through the inelastic dynamic modeling and analysis under earthquake loads for the safety security of masonry brick temple. Therefore, this study analyzes the seismic behavior characteristics and evaluates the seismic performance for the 479 structure with many cracks and deformations. Through the evaluation results, we found out the structural weak parts on earthquake loads.

• Geomechanics and Engineering
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• 제27권6호
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• pp.551-560
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• 2021

Due to the low strength and high compressibility characteristics, the loess deposits tunnels are prone to large deformations and collapse. An accurate stability evaluation for loess deposits is of considerable significance in deformation control and safety work during tunnel construction. 37 groups of representative data based on real loess deposits cases were adopted to establish the stability evaluation model for the tunnel project in Yan'an, China. Physical and mechanical indices, including water content, cohesion, internal friction angle, elastic modulus, and poisson ratio are selected as index system on the stability level of loess. The data set is randomly divided into 80% as the training set and 20% as the test set. Firstly, principal component analysis (PCA) is used to convert the five index system to three linearly independent principal components X1, X2 and X3. Then, the principal components were used as input vectors for probabilistic neural network (PNN) to map the nonlinear relationship between the index system and stability level of loess. Furthermore, Leave-One-Out cross validation was applied for the training set to find the suitable smoothing factor. At last, the established model with the target smoothing factor 0.04 was applied for the test set, and a 100% prediction accuracy rate was obtained. This intelligent classification method for loess deposits can be easily conducted, which has wide potential applications in evaluating loess deposits.

• 한국구조물진단유지관리공학회 논문집
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• 제22권4호
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• pp.27-36
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• 2018

현재 적용되고 있는 평가체계는 1996년 개정되어 이후 4차례 개정을 실시하였으나, 구조적 안전성의 확보 목표에 국한된 평가체계로 인해 장기적 관점의 성능저하 예측 및 예산투입을 위한 우선순위 의사결정의 근거로 활용하기에는 부족하다. 따라서, 본 연구에서는 델파이 기법과 AHP기법을 활용하여 기존 도로터널의 여러 구조형식 중 재래식(ASSM) 터널의 성능평가에 적합한 평가체계를 새롭게 제시하고자 한다. 국 내외의 기존 평가체계 및 평가항목을 검토한 결과, 도출가능한 평가항목이 한정적인 것으로 판단되어 기존에 적용되고 있는 항목에 대한 폐쇄적인 설문과 새로운 항목 도출을 위한 개방형 설문을 병행하여 설문조사를 실시하였다. 조사한 설문결과를 내용타당도 검증을 거쳐 재래식(ASSM)터널에 적합한 성능평가인자를 도출하였으며, AHP기법을 활용하여 도출된 평가항목에 대한 가중치를 산정한 후 구조물의 특성에 맞는 성능평가 체계를 새롭게 제시하여, 향후 성능평가 세부지침 수정 및 보완 시 참고자료로 활용될 수 있도록 하고자 한다.

• Smart Structures and Systems
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• 제6권2호
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• pp.135-146
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• 2010

This paper presents the perspective of the Structural Mechanics program of the Air Force Office of Scientific Research (AFOSR) on the damage assessment of structures for the period 2006-2009 when the author was serving as Program Manager at AFOSR. It is found that damage assessment of structures plays a very important role in assuring the safety and operational readiness of US Air Force fleet. The current fleet has many aging aircraft, which poses a considerable challenge for the operators and maintainers. The nondestructive evaluation technology is rather mature and able to detect damage with considerable reliability during the periodic maintenance inspections. The emerging structural health monitoring methodology has great potential, because it will use on-board damage detection sensors and systems, will be able to offer on-demand structural health bulletins. Considerable fundamental and applied research is still needed to enable the development, implementation, and dissemination of structural health monitoring technology.

• 한국철도학회논문집
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• 제9권5호
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• pp.594-600
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• 2006

In this study, transient and quasi-static analysis were done for the evaluation of structural integrity of the platform screen door due to train wind pressure. Fluent 6.0 was used to calculate the train wind pressure, and Ansys 10.0 was used to evaluate the structural stability of platform screen door due to train wind pressure. Transient analysis was used to check the design requirements of platform screen door, and quasi-static analysis was introduced to save the calculating time and check quickly structural performances when compared to those of transient analysis. The results show that structural stability of the platform screen door under train wind pressure is proven and quasi-static analysis can quickly check the structural integrity of platform screen door.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.775-779
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• 2007

The structural strength assessment of a carbody was performed using F.E. analysis and static test to verify the structural safety of newly manufactured carbody of a freight car. The freight car for the transportation of cold-rolled coils in steel making company was designed with SS400 steel for underframe and SM490A steel for bracket. Prior to the evaluation of structural strength, commercial finite element method(FEM) software was used for the stress and structural analyses on stress distribution in a carbody of freight car. The strain gages were attached on the carbody based on the FEM results. The actual vertical loading test and horizontal compression loading test were conducted, and the stress and displacement were obtained. Finally, the structural strength of carbody was evaluated by using a engineering techniques.

• Computational Structural Engineering : An International Journal
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• 제2권1호
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• pp.1-10
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• 2002

Information on the distribution of the basic random variables is essential for the accurate evaluation of structural reliability. The usual method for determining the distribution is to fit a candidate distribution to the histogram of available statistical data of the variable and perform appropriate goodness-of-fit tests. Generally, such candidate distributions would have two parameters that may be evaluated from the mean value and standard deviation of the statistical data. In the present paper, a-parameter Gamma distribution, whose parameters can be directly defined in terms of the mean value, standard deviation and skewness of available data, is suggested. The flexibility and advantages of the distribution in fitting statistical data and its significance in structural reliability evaluation are identified and discussed. Numerical examples are presented to demonstrate these advantages.

• 국제초고층학회논문집
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• 제3권2호
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• pp.89-98
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• 2014

Employing tilted forms in tall buildings is a relatively new architectural phenomenon, as are the cases with the Gate of Europe Towers in Madrid and the Veer Towers in Las Vegas. This paper studies structural system design options for tilted tall buildings and their performances. Tilted tall buildings are designed with various structural systems, such as braced tubes, diagrids and outrigger systems, and their structural performances are studied. Structural design of today's tall buildings built with higher strength materials is generally governed by lateral stiffness. Tilted towers are deformed laterally not only by lateral loads but also by dead and live loads due to their eccentricity. The impact of tilting tall buildings on the gravity and lateral load resisting systems is studied. Comparative evaluation of structural systems for tilted tall buildings is presented.