• Title/Summary/Keyword: 실물크기

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Vibration Test of a Full-Scale Five-Story Structure with Viscoelastic Dampers: Damper Design and Test for Response (점탄성 감쇠기가 설치된 실물크기 5층 건물의 진동실험: 감쇠기의 설계 및 응답실험)

  • 민경원;이상현;김진구;이영철;이승준;김두훈
    • Journal of the Earthquake Engineering Society of Korea
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    • v.7 no.3
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    • pp.9-15
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    • 2003
  • This paper presents a design procedure for viscoelastic dampers to be installed in a full-scale steel structure and observes their vibration control effect, based on the excitation method and the dynamic characteristics of the structure investigated in the companion paper, Additional damping ratios required to reduce the maximum displacement to a given level were obtained by convex model. The size of dampers was determined by observing the change in modal damping ratio due to the change in damper stiffness using the modal strain energy method, The effect of the supporting braces was also considered in the determination of the modal properties. Two viscoelastic dampers were installed at the first and second inter-stories, respectively and their response reduction is verified.

Excitation and System Identification of a Full-Scale Five-Story Structure for the Application of Viscoelastic Dampers (점탄성 감쇠기 적용을 위한 실물크기 5층 건물의 가진 및 시스템 식별)

  • 민경원;이상현;김진구;이영철;이승준;최현훈
    • Journal of the Earthquake Engineering Society of Korea
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    • v.7 no.3
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    • pp.1-7
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    • 2003
  • Excitation and system identification are carried out for a full-scale five-story structure to obtain fundamental data which will be used for the design of viscoelastic dampers, The hybrid mass driver(HMD) installed on the fifth floor was employed as external exciter to provide excitation for the building, Each floor response was measured and processed to find out where and how the viscoelastic dampers are located and designed. The sine-sweep and white noise loadings were applied to the structure by the HMD to obtain dynamic characteristics such as natural frequencies, damping ratios, and modes, The identified building was experimentally investigated again with the designed viscoelastic dampers installed at inter-stories to obtain the response behavior in the companion paper.

Magnification Device of Computed Tomography in Radiation Therapy Planning (방사선치료계획을 위한 진단용 CT 영상의 확대장치)

  • Yoon, Sei-Chul;Kim, Jong-Woo;Bahk, Yong-Whee
    • Radiation Oncology Journal
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    • v.4 no.2
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    • pp.179-181
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    • 1986
  • Computed tomography (CT) adds a new dimension in the study of body contour, organs, and tissues as well as various pathologic conditions. This modality provides a great degree of accuracy in radiation therapy Planning (RTP). However, CT images are usually taken on a small reduced format so that possible errors can be made during inputting the CT data into an automatic planner. Authors have designed a simple inexpensive magnifying device of CT images to obviate errors created by reduced image.

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A Study on the Similitude of member Behavior for Small-Scale Modeling of Reinforced Concrete Structure (철근콘크리트 축소모델의 부재거동 상사성에 관한 연구)

  • 이한선;장진혁
    • Magazine of the Korea Concrete Institute
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    • v.8 no.3
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    • pp.177-185
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    • 1996
  • Four types of experiments were performed to check the similitude of member behavior between prototype and 1 /10 scale models : (1) Test of slender columns with P-$\Delta$ effect, (2) Test of short columns with and without confinement steel, (3) Test of simple beams without stirrups, and (4) 'T-beam test. Based on the results of experiments, the conclusions were made as follows : (1) The P-$\Delta$ effect of slender columns can be almost exactly represented by 1/10 scale model. (2) The effect of confinement on short columns by the hoop steel can be also roughly simulated by 1/10 scale model. (3) The failure modes of simple beams without stirrups are brittle shear failures in prototype whereas those of 1/10 scale models are the ductile yielding of tension steel followed by large diagonal tension cracking and compressive concrete failure. (4) The behaviors of prototype and 1/10 scale model in T-beams appear very similar.

A Study on the Similitude of Precast Concrete Panel Structure Using one-third Scale Subassemblage Model (1/3 축적 모형실험에 의한 프리캐스트 콘크리트 판구조의 상사성에 관한 연구)

  • 윤재진
    • Magazine of the Korea Concrete Institute
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    • v.4 no.3
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    • pp.123-134
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    • 1992
  • 본연구는 실물크기의 프리캐스트 콘크리트 판구조물의 부분구조체를 모형화하여 실험한 결과를 분석한 것이다. 구조물의 역학적 특성과 파괴성상을 파악하기 위한 구조실험은 실물크기의 구조물과 부재로써 실시하는 것이 가장 좋은 방법이지만, 이것은 치수가 크므로 공간적으로 제한을 받고 많은 시간과 비용을 필요로 하기 때문에 모형실험을 이용하게 된다. 이러한 모형실험을 최소한의 오차범위내에서 원형실험과 같은 재현하고 예측하도록 실험을 준비하는 데에는 상사법칙이 필요하게 된다. 모형은 무엇보다도 원형과의 응력-변형도 관계 등 구성재료에 대한 상사요구조건을 만족시키는 것이 중요하지만, 본 연구의 대상은 1/3축척으로써 기하학적인 요소와 사용재료에 대한 강도의 상사성만을 고려한 모형이다. 본 연구에서는 이러한 모형구조물의 거동을 원형실험결과와 비교하여 상사성 확보의 문제와 가능성을 조사하였다.

Fire Damaged Behavior of Real Sized Normal Strength RC Columns (화해를 입은 실물크기 보통강도 RC 기둥의 거동)

  • Lee, Cha-Don;Shin, Yeong-Soo;Hong, Sung-Gul;Lee, Kyung-Ku;Lee, Seung-Whan
    • Journal of the Korea Concrete Institute
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    • v.15 no.6
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    • pp.866-876
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    • 2003
  • Experiments were performed for the real sized 12 reinforced concrete columns of 350${\times}$350${\times}$3350 mm with normal concrete in order to observe the fire-damaged behavior of these columns. Columns were heated according to the ISO heating curve. Main experimental parameters were: magnitude of axial load, heating time, cover thickness, and eccentricity. Effects of these parameters on the axial expansion and contraction, rotation, buckling, ISO fire resistance, and structural stability were experimentally quantified. It has been observed that the contraction rate of axial deformation was affected mostly by the duration of heating time and buckling of reinforcement or member by the magnitude of axial load, duration of heating time, cover thickness and eccentricity in order. Based on the experimental observations, ISO fire resistance criteria were qualiatively criticized.

지반하중조건에 따른 숏크리트 거동의 수치해석적 검증

  • Yu, Gwang-Ho;Jeong, Ji-Seong;Park, Yeon-Jun
    • Proceedings of the Korean Society for Rock Mechanics Conference
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    • 2007.10a
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    • pp.365-374
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    • 2007
  • 본 논문은 터널의 지반-지보재 상호 거동을 규명하기 위한 연구로서 주지보재인 숫크리트의 균열, 파괴하중 및 변형거동을 실물크기의 갱도모형실험을 통해 확인하고 3차원 수치 해석을 실시하여 각각의 결과를 비교 검증하였다. 갱도모형 실험은 실제 터널과 유사한 크기의 터널을 제작하여 11개 실린더에서 측압조건에 따라 하중을 가하여 실험을 수행하였다. 3차원 수치해석 모델링은 갱도모형실험과 가능하면 같은 조건으로 해석하기 위하여 모형실험으로부터 로드셀 및 LVDT를 통해 얻은 하중-변위곡선이 수치해석 시에도 재현되도록 하여 수행되었다.

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Construction Method and Durability Evaluation of Mock-up Test for Bobsleigh Track (실물크기형 봅슬레이 트랙 Mock-up Test 시공방법 및 내구성 평가)

  • Lee, Kyeo-Re;Han, Seung-Yeon;Nam-Gung, Kyeong;Yun, Kyong-Ku
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.1
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    • pp.315-323
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    • 2016
  • This study examined the durability and method for making a mockup of bobsled tracks for constructing a bobsled stadium, which is a sport in the Winter Olympics. As bobsleigh games are very fast and dangerous, a safety design for players and a precise construction using highly efficient shotcrete is necessary. Moreover, a general molding construction is difficult because bobsleigh tracks are composed of various curves and slopes, and it is necessary to construct them using high-strength and high durability materials. The developed method for making a mockup and performing durability evaluation of bobsleigh tracks through this research will be applied in the construction of the 2018 Pyeongchang Winter Olympics Sliding centre and bobsleigh tracks using domestic techniques.

Pseudo-Dynamic Test for the Bridges Retrofitted with Laminated Rubber Bearings (적층고무받침으로 내진보강된 교량의 유사동적실험)

  • Kwak, Im-Jong;Cho, Chang-Beck;Han, Kyoung-Bong;Kim, Young-Jin;Kwak, Jong-Won
    • Journal of the Earthquake Engineering Society of Korea
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    • v.9 no.1 s.41
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    • pp.43-50
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    • 2005
  • Many highway bridges in Korea need seismic retrofit because only one decade has passed since the seismic design criteria was introduced. For the highway bridges of which bearings are worn and dysfunctional, the validity of seismic retrofit method using laminated rubber bearings was discussed in this study. Real scale RC pier specimens without seismic details were constructed. And then, Pot bearing, Rubber bearing (RB), Lead-rubber bearing (LRB) were applied to these specimens. Through pseudo dynamic test method, dynamic behavior of these RC piers under earthquake was simulated and compared. From the test results, proposed seismic retrofit method was found to be valid.