• 제목/요약/키워드: pratt

검색결과 46건 처리시간 0.057초

프랫트러스의 디자인 구성요소 변화와 역학적 특성분석 (An Analysis of Mechanical Features and Variations of Design Composition Elements for Pratt Trusses)

  • 박찬수;이주나
    • 한국공간구조학회논문집
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    • 제13권2호
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    • pp.47-55
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    • 2013

  • The design composition elements and the mechanical behavior of trusses have been investigated for Pratt trusses. As a result, it was determined that the design composition elements of the trusses consist of the composition of webs, the distance between joints, the chords profile, the depth of the truss, and the double chord composition. In addition, by analyzing models with a variation of elements, comprehensive features of structural behavior have been presented for variations of design of Pratt trusses. This is to provide more effective and useful design information on truss structure in the architectural and structural planning stage.

  • https://doi.org/10.9712/KASS.2013.13.2.047 인용 PDF KSCI

트러스 형태에 따른 스태거드트러스 골조시스템의 구조특성에 관한 연구 (A Study on the Structural Behaviour of Staggered Truss System by the Shape of Truss)

  • 나창순;홍윤수;유은종
    • 한국전산구조공학회논문집
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    • 제30권3호
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    • pp.199-206
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    • 2017

  • 본 논문에서는 약진 지역에서 적용되는 스태거드트러스 골조시스템의 수평하중에 대한 구조특성을 분석하였다. 스태거드트러스 시스템에 적용되는 프랫, 하우, 와렌, K형, 비렌딜의 대표적인 트러스 형태를 기준으로 10층과 20층의 예제 건물에 대한 해석과 설계를 수행하여 트러스 형태에 따른 시스템의 경제성과 효율성을 비교.분석하였다. 설계에서 기둥 및 트러스 부재는 같은 부재를 몇 개 층씩 그루핑하여 사용하였으며 부재의 효율성은 그루핑된 부재의 평균 내력비를 기준으로 판단하였으며 시스템의 경제성은 전체 골조물량을 기준으로 판단하였다. 분석 결과 효율성과 경제성 측면에서 10층의 예제에서는 프랫트러스를 사용한 시스템이 우수한 것으로 나타났으며 20층의 예제에서는 와렌트러스를 사용한 방식이 우수한 것으로 나타났다.

  • https://doi.org/10.7734/COSEIK.2017.30.3.199 인용 PDF KSCI

인체관절의 회전중심 추정을 위한 구적합법의 비교 (The Comparison of Sphere Fitting Methods for Estimating the Center of Rotation on a Human Joint)

  • 김진욱
    • 한국운동역학회지
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    • 제23권1호
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    • pp.53-62
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    • 2013

  • The methods of fitting a circle to measured data, geometric fit and algebraic fit, have been studied profoundly in various areas of science. However, they have not been applied exactly to a biomechanics discipline for locating the center of rotation of a human joint. The purpose of this study was to generalize the methods to fitting spheres to the points in 3-dimension, and to estimate the center of rotation of a hip joint by three of geometric fit methods(Levenberg-Marquardt, Landau, and Sp$\ddot{a}$th) and four of algebraic fit methods(Delogne-K${\aa}$sa, Pratt, Taubin, and Hyper). 1000 times of simulation experiments for flexion/extension and ad/abduction at an artificial hip joint with four levels of range of motion(10, 15, 30, and $60^{\circ}$) and three levels of angular velocity(30, 60, and $90^{\circ}$/s) were executed to analyze the responses of the estimated center of rotation. The results showed that the Sp$\ddot{a}$th estimate was very sensitive to the marker near the center of rotation. The bias of Delogne-K${\aa}$sa estimate existed in an even larger range of motion. The Levenberg-Marquardt algorithm of geometric fit and the Pratt of algebraic fit showed the best results. The combination of two methods, using the Pratt's estimate as initial values of the Levenberg-Marquardt algorithm, could be a candidate of more valid estimator.

  • https://doi.org/10.5103/KJSB.2013.23.1.053 인용 PDF KSCI