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Analysis of Nonlinear Seismic Behavior of Reinforced Concrete Shear Wall Systems Designed with Special and Semi-Special Seismic Details (특수 및 준특수 상세에 따른 철근콘크리트 전단벽의 비선형 내진거동 해석)

  • Yoon, Sung-Joon;Lee, Kihak;Chun, Young-Soo;Kim, Tae-Wan
    • Journal of the Earthquake Engineering Society of Korea
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    • v.17 no.1
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    • pp.43-51
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    • 2013
  • In this paper, analytical models for reinforced concrete shear wall systems designed based on Korean Building Code (KBC2009) are proposed, which have special and semi-special seismic details and are compared with experimental results for a verification of analytical models. In addition, semi-special seismic details aimed to improve constructability and enhance economic efficiency were proposed and evaluated. The analytical models were performed based on nonlinear static and dynamic analysis. Through the nonlinear analyses, two seismic details showed the similar seismic behavior from the cyclic test and the analytical models for the two different seismic details represented the behavior in terms of the initial stiffness, maximum strength and strength degradation. And newly proposed seismic details(semi-special) provided with similar hysterestic behavior as well as the maximum drift.

Parametric Study on Hollow Reinforced Concrete Bridge Column Sections with Reinforcement Details for Material Quantity Reduction (물량저감 철근상세를 갖는 중공 철근콘크리트 교각단면에 관한 매개변수 연구)

  • Kim, Tae-Hoon;Kim, Ho-Young;Lee, Jae-Hoon;Shin, Hyun-Mock
    • Journal of the Earthquake Engineering Society of Korea
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    • v.17 no.4
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    • pp.159-169
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    • 2013
  • The purpose of this study is to investigate the inelastic behavior of hollow reinforced concrete bridge column sections with reinforcement details for material quantity reduction and to provide the details and reference data. Among the numerous parameters, this study concentrates on the shape of the section, the reinforcement details, the diameter of the transverse reinforcement and loading types. Eighteen column section specimens were tested under quasi-static monotonic loading. In this study, the computer program RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology) was used. A modified lateral confining effect model was adopted for the hollow bridge column sections. This study documents the testing of hollow reinforced concrete bridge column sections with reinforcement details for material quantity reduction and presents conclusions based on the experimental and analytical findings.

Seismic Performance of Reinforced Concrete Frame Retrofitted with Opening-Isolated Type System (개구부 격리형 시스템으로 보강된 철근콘크리트 골조의 내진성능)

  • Park, Wan-Shin;Kim, Sun-Woo;Jung, Hyun-Seok
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.36 no.2
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    • pp.137-144
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    • 2020
  • The purpose of this study is to experimentally evaluate the effect of improving seismic performance by applying the details of seismic reinforcement to the reinforced concrete frame with non-seismic details while maintaining the original opening shape. In this study, based on CF specimens with specific seismic details, a total of four full scale specimens were designed and fabricated. The main variables are the width and spacing of steel dampers installed in the upper and lower parts of seismic reinforcement details, and the presence or absence of torsion springs installed in the hinges. As a result of the test, it was evaluated to be helpful for seismic retrofit and opening isolation of steel dampers installed at the upper and lower parts of the seismic reinforcement details and torsion springs installed at the joints. In particular, CFR2S specimens with torsion springs showed the best performance in terms of strength, stiffness and energy dissipation capacity with increasing displacement angle.

A study on the shoulder composition methods of power shoulder jackets and corresponding details (파워숄더 재킷의 어깨 구성 방법과 디테일 대응 분석)

  • Park, Jeongah;Lee, Jeongran
    • The Research Journal of the Costume Culture
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    • v.29 no.3
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    • pp.388-405
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    • 2021
  • This study classifies the compositional methods of power shoulder jackets from 1980 to the present. It analyzes the relevance of jacket details according to how the power shoulder changes and its compositional methods by era. The research subdivides shoulder compositional techniques into seven, based on shoulder variation, sleeve variation, and the body and sleeve combination. The researcher investigates the frequency and trends of composing shoulders and analyzes details pertaining to the silhouette, jacket length, collar shape, and front closure. The most common method of shoulder composition is an angular shoulder variation. The others are a rounded shoulder variation, puffed sleeve, sleeve variation using pattern incision, raglan and kimono sleeves, and a shoulder variation that expanded the angle and width. The frequency differs slightly for each era. The relationship between shoulder compositional methods and details of power shoulder jackets is statistically significant, showing period-related differences. The homogeneity analysis results reveal that the shoulder composition of power shoulder jackets, the times, and details fall into distinct groups. This analysis shows that the silhouette, length, collar, and front closure of the power shoulder jacket differ depending on the power shoulder's compositional methods. Moreover, the shape of the power shoulder jacket is distinctly different. One can use this data to help develop the power shoulder jacket design by reflecting the details of shoulder compositional methods and changing trends over time.

The Influence of Details on the Sense of Place in Islamic Gardens - Focusing on 'the Courtyard of the Lions' - (이슬람정원에서 디테일이 장소성에 미친 영향 -'사자의 중정'을 대상으로 -)

  • Yoon, Mi-Bang;Kim, Han-Bai
    • Journal of the Korean Institute of Landscape Architecture
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    • v.38 no.5
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    • pp.122-133
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    • 2010
  • Humans desire the achievement a of sense of unity between themselves and place to create an identity of place as a realization of his or her sense of belonging. Humans develop ideas from their culture and environment to be expressed physically within the landscape through symbols. Symbols are formed within a place through the structure of the space and, more visually, through the details. The purpose of this paper is to examine the structure of space and the details of 'the Courtyard of the lions' in the Alhambra and to study how the details influence the formation of the identity of place. This paper also compares the structure and details in terms of the meaning of symbols, design languages, cultural, social and historical background and the experience of the place. The structure of the space in 'the Courtyard of the Lions' represents Paradise in the Islamic religion a common theme in the composition of traditional Islamic gardens. The design languages expressed within the structure are order, balance, accent and enclosure; the inherit meanings of the structure are religion, the natural environment and way of life. The details tell of the ideology of Paradise, royalty, nature, and praise of God, while their design languages include physical and visual continuity, accent, variation, the feeling of movement, rhythm, and depth perception. The details also express the historical background of the Dynasty of Nasrid and the style of Mudejar. The name 'the Courtyard of the Lions' was taken from the detail of the lim figures, details within the landscape which are important in building an identity of place. This study demonstrates that the details at 'the Courtyard of the lions' achieved a sense of unity between man and place. In conclusion, details have immense influence in building of the identity of place.

A Comparative Analysis of Classical Data in KCR 4 and CCR 2 (한국목록규칙과 중국문헌편목규칙의 고전자료 목록기술규칙 비교 분석)

  • Han, Mi-Kyung
    • Journal of the Korean Society for Library and Information Science
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    • v.47 no.3
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    • pp.275-293
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    • 2013
  • This study conducted comparative analysis of cataloging descriptions and rules in KCR 4 and CCR 2, as follows, for the purpose of seeking understanding of classical materials cataloging rules and networking of oriental historical data cataloging (bibliographical descriptions). First, to compare the general rules, the objects of descriptions and composition of descriptions, recording order, and punctuation and information source of descriptions were analyzed. As a result, KCR 4 is more detailed in terms of author role identifications and information source regulations and CCR2 is more detailed in terms of regulations related to printing and publications and serial publications. Second, to compare the details, the main titles and liability indications, edition details, publication details and format details, and note details. As a result, regarding the description of edition type and publication details, KCR4 has detailed regulations and CCR2 has characteristic summary in terms of note details.

Performance Assessment of Solid Reinforced Concrete Columns with Triangular Reinforcement Details (삼각망 철근상세를 갖는 중실 철근콘크리트 기둥의 성능평가)

  • Kim, Tae-Hoon;Lee, Seung-Hoon;Lee, Jae-Hoon;Shin, Hyun Mock
    • Journal of the Korea Concrete Institute
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    • v.28 no.1
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    • pp.75-84
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    • 2016
  • The purpose of this study was to investigate the performance of solid reinforced concrete columns with triangular reinforcement details. The proposed reinforcement details has economic feasibility and rationality and makes construction periods shorter. A model of solid reinforced concrete columns with triangular reinforcement details was tested under a constant axial load and a quasi-static, cyclically reversed horizontal load. A computer program, RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures was used. The used numerical method gives a realistic prediction of performance throughout the loading cycles for several test specimens investigated. As a result, proposed triangular reinforcement details for material quantity reduction was superior to existing reinforcement details in terms of required performance.

Research on the longitudinal stress distribution in steel box girder with large cantilever

  • HONG, Yu;LI, ShengYu;WU, Yining;XU, Dailing;PU, QianHui
    • Steel and Composite Structures
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    • v.44 no.5
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    • pp.619-632
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    • 2022
  • There are numerous structural details (Longitudinal beam, web plate, U-ribs and I-ribs) in the top and bottom plates of steel box girders, which have significant influences on the longitudinal stress (normal stress) distribution. Clarifying the influence of these structural details on the normal stress distribution is important. In this paper, the ultra-wide steel box girder with large cantilevers of the Jinhai Bridge in China, which is the widest cable-stayed bridge in the world, has been analyzed. A 1:4.5 scale laboratory model of the steel box girder has been manufactured, and the influence of structural details on the normal stress distribution in the top and bottom plates for four different load cases has been analyzed in detail. Furthermore, a three-dimensional finite element model has been established to further investigate the influence regularity of structural details on the normal stress. The experimental and finite element analysis (FEA) results have shown that different structural details of the top and bottom plates have varying effects on the normal stress distribution. Notably, the U-ribs and I-ribs of the top and bottom plates introduce periodicity to the normal stress distribution. The period of the influence of U-ribs on the normal stress distribution is the sum of the single U-rib width and the U-rib spacing, and that of the influence of I-ribs on the normal stress distribution is equal to the spacing of the I-ribs. Furthermore, the same structural details but located at different positions, will have a different effect on the normal stress distribution.

Seismic Performance Evaluation of Reinforced Concrete Buildings Strengthened by Embedded Steel Frame (내부 매입형 철골조로 보강된 철근콘크리트 건물의 내진 성능평가)

  • Kim, Seonwoong;Lee, Kyungkoo
    • Journal of the Earthquake Engineering Society of Korea
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    • v.24 no.1
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    • pp.29-37
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    • 2020
  • This study is to investigate the effect of a retrofitted reinforced concrete frame with non-seismic details strengthened by embedded steel moment frames with an indirect joint, which mitigates the problems of the direct joint method. First, full-scale experiments were conducted to confirm the structural behavior of a 2-story reinforced concrete frame with non-seismic details and strengthened by a steel moment frame with an indirect joint. The reinforced concrete frame with non-seismic details showed a maximum strength of 185 kN at an overall drift ratio of 1.75%. The flexural-shear failure of columns was governed, and shear cracks were concentrated at the beam-column joints. The reinforced concrete frame strengthened by the embedded steel moment frames achieved a maximum strength of 701 kN at an overall drift ratio of 1.5% so that the maximum strength was about 3.8 times that of the specimen with non-seismic details. The failure pattern of the retrofitted specimen was the loss of bond strength between the concrete and the rebars of the columns caused by a prying action of the bottom indirect joint because of lateral force. Furthermore, methods are proposed for calculation of the specified strength of the reinforced concrete frame with non-seismic details and strengthened by the steel moment frame with the indirect joint.

Visual Evaluation of Retro-Romantic Fashion (레트로 로맨틱 패션의 시각적 평가)

  • Cho, Mal-Hee;Lee, Myoung-Hee
    • The Research Journal of the Costume Culture
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    • v.17 no.3
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    • pp.523-534
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    • 2009
  • The purpose of this study is to categorize the dimensions of the visual evaluation of the costume details of the retro romantic fashion and to research on the costume details and the visual evaluation by evaluators' gender, age, and major, and on their preferences. Quantitative research were conducted for this study. Based on the pictures, 10 costume details were selected for the survey questions and data were collected. All 446 subjects who participated in this research were college students(males and females) residing in or near Seoul. Data were collected in September, 2008. The collected data were statistically analyzed using SPSS which included: factor analysis, Cronbach's $\alpha$ reliability analysis, three-way ANOVA, two-way ANOVA, one-way ANOVA, Duncan's multiple range tests, and the t-test. The results of visual evaluation of retro romantic fashion are as follows: First, as a result of the factor analysis of the costume detail evaluation, five factors including attractiveness, decorativeness, cuteness, retro, and femininity surfaced. Second, the gender difference in the results of the research revealed that women rated decorative, cute, retro, and feminine characteristics higher than men did. Third, there were significant interactive effects in attractiveness and femininity depending on costume details and evaluators' gender. Fourth, subjects majoring in fashion valued attractiveness and femininity of the stimulus over non-fashion majoring subjects. Fifth, there were significant differences in the preferences of costume details depending on gender.

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