• 제목/요약/키워드: rigidity

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Pile과 지반특성을 고려한 기초구조물의 거동해석 (Analysis far Behavior of Substructure Considering Characteristics of Pile and Soil)

  • 안주옥;공천석;정영묵;임정열
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 2000년도 봄 학술발표회논문집
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    • pp.253-259
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    • 2000
  • This thesis investigated the behavior of super structure by varying the factors such as the change of pile rigidity, the characteristics of soil and the constraint condition of support. The results of this study are as follows; 1. The pile rigidity in the Fig 3.3 computed by the rotating deformed plane method becomes the elastic range at approximately about 5.1 m (D : 1.0 m) below the ground level. This result is consistent with the previous study that the pile deformation occurs approximately 3 to 6 times pile diameter from the pile head. 2. The values of forces and deformations for the structure-pile system in Y-direction appeared larger than that in X-direction, since the pile rigidity and constraint condition of support were changed as shown Fig.3.5 to 3.8. 3. The current practice for the analysis of structure-pile system has not considered the variation of pile rigidity and the constraint condition of support. So, the analysis of structure-pile system with large difference in super-structure rigidity must includes these factors in both X and Y directions.

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CFRP적층판의 충격손상특성 및 손상거동에 미치는 초기굽힘의 영향 (Effect of pre-bending on the properties of impact damage in CFRP laminates)

  • 신형섭;서창민;황남성
    • 대한기계학회논문집
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    • 제18권5호
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    • pp.1144-1149
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    • 1994
  • Damage caused in CFRP laminates by low energy impact of steel ball are investigated ultrasonically. Two types of laminated specimens having different stacking sequence are used as a target material. The effects of pre-bending on the behaviors of impact damage are specifically discussed. The initiation and progagation behaviors of delamination were largely dependent upon the bending rigidity of each specimen. Specimen C having higher bending rigidity produced larger delamination damage than the Specimen D having relatively low bending rigidity, however it was little for the Specimen C. Application of pre-bending increased the apparent bending rigidity of target during impacting, it produced delamination at lower impact energy level compared to the case of no preload.

긴장성 기흉으로 오인된 지연 발현된 아편양 제제 유발 근경축 -증례보고- (Opioid-induced Muscle Rigidity with a Delayed Manifestation Misunderstood as a Tension Pneumothorax -A case report-)

  • 강봉진;김성훈
    • The Korean Journal of Pain
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    • 제21권1호
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    • pp.66-70
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    • 2008
  • Opioid-induced rigidity is a potentially life-threatening complication that can occur after treatment with large doses of opioids, but with early recognition it can be treated effectively with naloxone or with muscle relaxants. Regarding its onset time, there have been few case reports that have described delayed manifestations of opioid-induced rigidity. The mechanism of this complication is not well understood. In this report we describe a case of incidental overdose injection of sufentanil and subsequently review the confusing clinical features that require immediate diffenrentiation and the possible mechanim of this complication.

연속식 자외선/오존 조사처리가 PET와 PTT 직물의 물성에 미치는 영향 (Effect of Continuous UV/$O_{3}$ Irradiation on the Physical Properties of PET and PTT Fabrics)

  • 김민지;장진호;정영진
    • 한국섬유공학회지
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    • 제41권2호
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    • pp.80-85
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    • 2004
  • Continuous UV irradiation on textiles has been recently exploited as a practical surface treatment due to the commercial development of high intensity UV light source. In this study PET and PTT fabrics were continuously irradiated with an electrodeless UV lamp for different periods of time. The effect of UV/O$_3$ treatment on the mechanical properties of the polyester fabrics relevant to the apparel manufacturing process, such as fabric thickness, crimp, modulus, extensibility, bending and shear rigidity, were studied. The physical properties of PTT fabric were more influenced by the UV treatment than PET fabric. The widthwise extensibility of treated PTT fabric increased with UV/O$_3$ irradiation time due to crimp increase and fabric shrinkage which occur during UV/O$_3$ irradiation. The shrunken fabric structure resulted in increased bending rigidity. However the shear rigidity of treated fabrics decreased due to stress relaxation, presumably by infra-red emitted with UV irradiation.

2합 멀티필라멘트사의 굽힘특성에 관한 연구 (III) (A Study of Bending Properties of 2- Ply Muitifilament Yarns (III))

  • 김승진;박장환;오애경;김덕리
    • 한국섬유공학회지
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    • 제29권10호
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    • pp.38-46
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    • 1992
  • Bending rigidity of a 2-ply multifilament yarn was derived in terms of physical and mechanical characteristics of its constituent filaments and yarn structural parameters. Experime-ntal and theoretical results were compared for the multifilament yarn and with various structural parameters. The maximum bending rigidity of 2-ply multifilament yarns was observed around ply helix angle of 15 degree for both theoretical and experimental results. Theoretical analysis shows that bending rigidity of 2-ply multifilament yarn increases with the ratio of filament torsional rigidity to its bending rigidity. The theoretical results show good agreement to experimental one when the ply helix angle is lower than 10 degree, however, experimental results show much higher value than theoretical ones when the ply helix angle is higher than 15 degree.

Simplified dynamic analysis of slender tapered thin-walled towers with additional mass and rigidity

  • Takabatake, Hideo;Mizuki, Akira
    • Structural Engineering and Mechanics
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    • 제3권1호
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    • pp.61-74
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    • 1995
  • A linearly tapered, doubly symmetric thin-walled closed member, such as power-transmission towers and tourist towers, are often characterized by local variation in mass and/or rigidity, due to additional mass and rigidity. On the preliminary stage of design the closed-form solution is more effective than the finite element method. In order to propose approximate solutions, the discontinuous and local variation in mass and/or rigidity is treated continuously by means of a usable function proposed by Takabatake(1988, 1991, 1993). Thus, a simplified analytical method and approximate solutions for the free and forced transverse vibrations in linear elasticity are demonstrated in general by means of the Galerkin method. The solutions proposed here are examined from the results obtained using the Galerkin method and Wilson-${\theta}$ method and from the results obtained using NASTRAN.