• Earthquakes and Structures
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• 제14권6호
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• pp.505-523
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• 2018

Static pushover analyses of typical existing reinforced concrete frames, designed according to the previous generations of design codes in Greece, have established these structures' inelastic characteristics, namely overstrength, global ductility capacity and available behaviour factor q, under planar response. These were compared with the corresponding demands at the collapse limit state target performance point. The building stock considered accounted for the typical variability, among different generations of constructed buildings in Greece, in the form, the seismic design code in effect and the material characteristics. These static pushover analyses are extended, in the present study, in the time history domain. Consequently, the static analysis predictions are compared with Incremental Dynamic Analysis results herein, using a large number of spectrum compatible recorded base excitations of recent destructive earthquakes in Greece and abroad, following, for comparison, similar conventional limiting failure criteria as before. It is shown that the buildings constructed in the 70s exhibit the least desirable behaviour, followed by the buildings constructed in the 60s. As the seismic codes evolved, there is a notable improvement for buildings of the 80s, when the seismic code introduced end member confinement and the requirement for a joint capacity criterion. Finally, buildings of the 90s, designed to modern codes exhibit an exceptionally good performance, as expected by the compliance of this code to currently enforced seismic provisions worldwide.

• 한국안전학회지
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• 제9권1호
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• pp.3-8
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• 1994

This paper has described the analysis of the Stress Intensity Factor behaviour of a short crack Initiated from notch tip. The model for finite element analysis is a double edge notched specimen. The parameters used in this study are crack length and notch root curvature radius.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1990년도 PROCEEDINGS OF THE FIRST KOREA-JAPAN JOINT GEOTECHNICAL SEMINAR ON EXCAVATION and TUNNELING IN URBAN AREAS
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• pp.163-175
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• 1990

A main factor in the design of excavation in an urban area is the movements. The finite element method provides rational predictions of excavation behaviour, yet practical engineers may find difficulties in applying it to the actual field case. In this study, factors affecting the excavation behaviour are considered in details and the applicability of the finite element method to the actual field excavation cases is presented. Numerical examples are analyzed to provide results of parametric study on the affecting factors.

• 한국생산제조학회지
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• 제9권5호
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• pp.73-79
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• 2000

The applications of fracture mechanics have traditionally concentrated on cracks loaded by tensile stresses, and growing under an opening or mode I mechanism. However, many cases of failures occur from growth of cracks subjected to mixed mode loading. Several criteria have been proposed regarding the crack growth direction under mixed mode loadings. This paper is aimed at investigation of fatigue crack growth behaviour under mixed mode(I＋II) with variation of angle and pre-crack length in two dimensional branched type precrack. Especially the direction of fatigue crack propagation was predicted and effective stress intensity factor was calculated by finite element analysis(FEA. In this paper, the maximum tangential stress(MTS) criterion was used to predict crack growth direction. Not only experiment but also finite element analysis was carried out and the theoretical predictions were compared with experimental results.

• 콘크리트학회논문집
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• 제12권3호
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• pp.31-37
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• 2000

When a crack is produced in a concrete structure, a micro crack zone of fracture process zone (FPZ) appears at the crack tip. To investigate the behaviour of this the micro crack zone, nonlinear fracture mechanics (NLFM) must be applied. However, when a massive concrete structure such as a concrete gravity dam is considered, the micro crack zone can be neglected and the structure can be assumed to have linear elastic fracture mechanics (LEFM) behaviour. This study is divided into two main topics : (1) Calculating stress intensity factor (SIF) at the crack tip by surface integral method and (2) Investigating the propagation of the initial crack. If the initial crack propagates, the angle of the propagation is calculated by using maximum circumferential tensile strength theory. This study, also, contains the effects of body forces and water pressures on the crack face.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 가을 학술발표회 논문집
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• pp.223-228
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• 2000

The current slope stability analysis of a filldam is based on the limit equilibrium method, and in calculation of safety factor during earthquake, adopts the seismic intensity method in which it considers a uniform seismic force from dam foundation to crest. However the observed behaviour of filldam during earthquake shows some different behaviour in that at the crest the measured acceleration is usually several times the ground acceleration. In this study, slope stability calculations of a filldam are provided based on the modified seismic intensity method, which can take into account the amplification phenomena of acceleration in the upper part of dam. And also the results of calculations are compared with that of current seismic intensity method.

• 패션비즈니스
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• 제16권3호
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• pp.45-62
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• 2012

This study aims to examine the effect of talent types on the purchasing behaviour of beauty-service products in 367 adults(female and male). The present study is the first to consider both talent types and the purchasing behaviour of beauty-service products correlates to appearance management behaviour. Frequency analysis showed that the mean of 8 talent types of 367 participants was 3.324. The highest talent type of 367 participants was interpersonal talent, the lowest talent type was logical-mathematical talent among 8 talent types. There were statistically significant relationships between the talent types(specially, bodily-kinesthetic talent and interpersonal talent) and the purchasing criteria of beauty-service products on the correlation analysis. And the effects of 8 talent types on the purchasing frequency of 4 beauty-service products were significant on the regression analysis, specifically, the results showed that the most significant among 8 talent factors was the interpersonal talent, next, the bodily-kinesthetic was. Thus, the more purchasing frequency of beauty-services products, the higher interpersonal talent were, and the better affinity with others were. As a results, the interpersonal talent factor and bodily-kinesthetic talent factor among 8 talent factors were ultimately affecting the appearance management behaviour. The higher the score, it was concluded that the subject was more active in beauty-related behavior. Conclusively, the appearance is a form of personal asset for one's self-fulfillment, and strong and beautiful appearance is a medium to improve self-esteem and dominance. It is possessing a significant influence in personal satisfaction, self-identity, and social success.

• 대한한방소아과학회지
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• 제23권1호
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• pp.127-140
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• 2009

Objectives In this study, we obtained Korean version of CEBQ (Children's Eating Behaviour Questionnaire) and verify whether it is reliable or not. Methods Total 106 parents completed this questionnaire, and we gathered children's BMI data and examined the relationship between children's BMI and mean scale scores. Results 1. This study results confirmed the theorectical factor structure, with acceptable internal reliability and between-subscale correlations. 2. There are significant mean scale scores difference between anorexia group and control group. 3. There are significant relations between children's BMI and mean scale scores. Conclusions The results support the use of the CEBQ as a phsychometrically sound tool for assessing children's eating behaviours in Korean children.

• 한국철도학회논문집
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• 제2권3호
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• pp.61-69
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• 1999

The durability of ballast plays an important role in track behaviour. To estimate the deterioration characteristics of ballast, several tests have been carried out by several scholars. The deterioration characteristics is very important factor in the behaviour of track and its life. In this paper, abrasion/breakage characteristics of ballast is studied to see the effect of physical ballast characteristics on ballast life. To reveal breakage characteristics of ballast, the ballast box test and the MTT field test were carried out. The breakage characteristics studied in this paper is applied to the ballast life prediction in various conditions, such as LA abrasion, annual tonnage, tamping number per year, etc

• 한국철도학회논문집
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• 제9권4호
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• pp.401-411
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• 2006

The major objective of this study is to investigate the dynamic behaviors of track due to the deterioration characteristics of ballast for servicing tracks by the field test. The durability of ballast plays an important role in the track behaviour. To estimate the deterioration characteristics of ballast, several tests have been carried out by several scholars. The deterioration characteristics of ballast is one of the most important factor in the dynamic behaviour of track and its life. In this paper abrasion/breakage characteristics of ballast is studied to predict the effect of physical ballast characteristics on ballast track. To reveal deterioration characteristics of ballast, the field test were carried out. The deterioration characteristics, studied in this paper, is applied to the dynamic behaviour of track in various conditions.