• 제목/요약/키워드: effective length

검색결과 3,117건 처리시간 0.029초

고정 지점을 갖는 X-브레이싱의 탄성 면외 좌굴 (Out-of-Plane Elastic Buckling of X-Bracing System with Fixed Ends)

  • 문지호;윤기용;이학은
    • 한국방재학회:학술대회논문집
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    • 한국방재학회 2007년도 정기총회 및 학술발표대회
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    • pp.293-296
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    • 2007
  • This study investigated the out-of-plane elastic buckling load and effective length factor of X-bracing system. The members of X-bracing system which are studied in this paper are rigidly attached to the structure at their end connections, and are pinned or rigidly connected at their point of intersection. The effective length factors are derived for the general case where the tension and compression brace have different material and geometrical properties.

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Estimation of Effective Coil Length of Superconducting Generator using 3D FEM

  • Shin, Pan-Seok;Park, Doh-Young
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • 제12B권1호
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    • pp.7-12
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    • 2002
  • This paper presents a method to estimate an effective length of a 1000-kVA superconducting generator using three-dimensional FE analysis. Flux linkage of stator coil and the induced voltage are calculated with FEM program and Faraday's law. An effective length of the stator coil is estimated using the calculated voltage and geometric configurationn of the machine. In order to verify the estimation method, 30-kVA superconducting generator is built and tested. The test result agrees reasonably well with the estimation.

유한요소해석에서 탄성 및 비탄성 기둥에 대한 유효길이 계수의 자동산정 (Automatic Generation of Effective Length Factor of Elastic and Inelastic Column in the Finite Element Analysis)

  • 이성우;이선구;이형우
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 1993년도 가을 학술발표회논문집
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    • pp.24-31
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    • 1993
  • In the design of column, computation of effective length factor for calculation of allowable compressive stress is inevitable. In this study. computer code which automatically generates effective length factor in the finite element analysis is developed. The program is developed to be used for orthogonal and nonorthogonal frame structure. Some i1lustrative examples verify that the computation results we correct for various cases.

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FRP로 보강된 콘크리트 부재의 유효부착길이 평가방법 제안 (Develop Evaluation Method of Effective Bond Length Between Concrete and Fiber Reinforcement Polymer)

  • 이원호;우현수;최기선;강대언;양원직;유영찬
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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    • pp.125-128
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    • 2005
  • Recently new materials, such as fiber reinforced polymer(FRP) and other composite materials are being applied in reinforcing plate or plate or prestressing cables of concrete structures. Although these new materials themselves show the excellent durability and high strength, the bond behaviour between concrete surface and FRP is not well recognized. Therefore, this paper propose a evaluation method for effective bond length between fiber reinforced polymer(FRP) and concrete. To develop the evaluation method, this paper presents a review of current evaluation methods for effective bond length. These methods are compared by single face test, expose merits and demerits. And based on them, new evaluation method was developed. Finally, the new method was compared with existing methods to verify a adequateness for evaluation of effective bond length.

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Effects of shear deformation on the effective length of tapered columns with I-section for steel portal frames

  • Li, Guo-Qiang;Li, Jin-Jun
    • Structural Engineering and Mechanics
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    • 제10권5호
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    • pp.479-489
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    • 2000
  • Based on the stiffness equation of the tapered beam element involving the effects of axial force and shear deformation, numerical investigations are carried out on elastic instability for web-linearly tapered columns with I-section of steel portal frames. Effects of shear deformation on the effective length of the tapered columns with I-section are studied. An efficient approach for determining the effective length of the tapered portal frame columns considering effects of shear deformation is proposed.

정현상 변단면 기둥의 유효길이 계수 (Effective Length Factors of Framed Columns with Sinusoidally Tapered Sections)

  • 박재영;송상용;김순철;이수곤
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 2003년도 가을 학술발표회 논문집
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    • pp.243-250
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    • 2003
  • A method for the determination of effective length factors of the framed columns with sinusoidally tapered sections is proposed. In the study, the stability analysis of the single story-two equal bay, frame with tapered columns is performed first by finite element method. The changes of the critical load coefficients of frames are reprersented by algebraic equations of the analysis parameters. The effective length factor formula is expressed in terms of proposed algebraic equation. The effective length factors for the prismatic columns (α=0.0) estimated by the proposed method coincide fairly well with those determined by the analytical method.

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Accuracy Analysis of Extraction Methods for Effective Channel Length in Deep-Submicron MOSFETs

  • Kim, Ju-Young;Choi, Min-Kwon;Lee, Seong-Hearn
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제11권2호
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    • pp.130-133
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    • 2011
  • A comparative study of two capacitance methods to measure the effective channel length in deep-submicron MOSFETs has been made in detail. Since the reduction of the overlap capacitance in the accumulation region is smaller than the addition of the inner fringe capacitance at zero gate voltage, the capacitance method removing the parasitic capacitance in the accumulation region extracts a more accurate effective channel length than the method removing that at zero gate voltage.

Accurate RF C-V Method to Extract Effective Channel Length and Parasitic Capacitance of Deep-Submicron LDD MOSFETs

  • Lee, Sangjun;Lee, Seonghearn
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제15권6호
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    • pp.653-657
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    • 2015
  • A new paired gate-source voltage RF capacitance-voltage (C-V) method of extracting the effective channel length and parasitic capacitance using the intersection between two closely spaced linear regression lines of the gate capacitance versus gate length measured from S-parameters is proposed to remove errors from conventional C-V methods. Physically verified results are obtained at the gate-source voltage range where the slope of the gate capacitance versus gate-source voltage is maximized in the inversion region. The accuracy of this method is demonstrated by finding extracted value corresponding to the metallurgical channel length.

프리텐션 프리스트레스트 콘크리트 부재의 정착길이 평가 (Experimental study on development length of prestressing strand in pretensioned prestressed concrete members)

  • 김의성
    • 건설안전기술
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    • 통권49호
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    • pp.84-91
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    • 2009
  • By bond mechanism between the prestressing strand and the concrete surrounding it, the effective force of prestressing must be transferred to the concrete entirely. The distance required to transfer the effective force of prestressing is called the transfer length, and the development length is the bond length required to anchor the strand as it resists external loads on the member. Transfer length was determined from the concrete strain profile at the level of the strands at transfer and development length was determined from various external loading lengths and compared with current code equation. Through the test results, bond failure is predicted based on the distress caused by cracks when they propagate within the transfer zone of prestressing strand. The current code equation was found to be conservative in comparison with the measured value.

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프리텐션 프리스트레스트 콘크리트 부재의 정착길이 정가 (Experimental Study on Development Length of Prestressing Strand in Pretensioned Prestressed Concrete Members)

  • 김의성
    • 한국안전학회지
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    • 제23권6호
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    • pp.115-121
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    • 2008
  • By bond mechanism between the prestressing strand and the concrete surrounding it, the effective force of prestressing must be transferred to the concrete entirely. The distance required to transfer the effective force of prestressing is called the transfer length, and the development length is the bond length required to anchor the strand as it resists external loads on the member. Transfer length was determined from the concrete strain profile at the level of the strands at transfer and development length was determined from various external loading lengths and compared with current code equation. Through the test results, bond failure is predicted based on the distress caused by cracks when they propagate within the transfer zone of prestressing strand. The current code equation was found to be conservative in comparison with the measured value.