• Title/Summary/Keyword: 수평 유지

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Modified Modulus of Elasticity of Concrete Column with Steel Bars (철근을 고려한 콘크리트 기둥의 수정탄성계수)

  • Yoon, Dong-Yong;Song, Hyung-Soo;Jang, Won-Seok;Min, Chang-Shik
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.9 no.1
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    • pp.101-111
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    • 2005
  • In this study, it is investigated the modified modulus of elasticity of the reinforced concrete columns including the longitudinal reinforcing steels as well as the confinement effect of the core concrete due to the transverse reinforced steel through the literature reviews. Equations are derived in order to evaluate the modified modulus of elasticity for the reinforced compressive concrete including the confinement effect. The finite element analysis for the 20 story reinforced concrete building is undertaken as a case study depending on the steel ratio and modulus of elasticity, and the analysis results are discussed.

Implementation of Intelligent Moving Target Tracking and Surveillance System Using Pan/Tilt-embedded Stereo Camera System (팬/틸트 탑제형 스테레오 카메라를 이용한 지능형 이동표적 추적 및 감시 시스템의 구현)

  • 고정환;이준호;김은수
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.4C
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    • pp.514-523
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    • 2004
  • In this paper, a new intelligent moving target tracking and surveillance system basing on the pan/tilt-embedded stereo camera system is suggested and implemented. In the proposed system, once the face area of a target is detected from the input stereo image by using a YCbCr color model and then, using this data as well as the geometric information of the tracking system, the distance and 3D information of the target are effectively extracted in real-time. Basing on these extracted data the pan/tilted-embedded stereo camera system is adaptively controlled and as a result, the proposed system can track the target adaptively under the various circumstance of the target. From some experiments using 80 frames of the test input stereo image, it is analyzed that standard deviation of the position displacement of the target in the horizontal and vertical directions after tracking is kept to be very low value of 1.82, 1.11, and error ratio between the measured and computed 3D coordinate values of the target is also kept to be very low value of 0.5% on average. From these good experimental results a possibility of implementing a new real-time intelligent stereo target tracking and surveillance system using the proposed scheme is finally suggested.

A Study of Earth Pressure and Deformation acting on the Flexible Wall in Soft Soil (연약지반 흙막이벽에 작용하는 토압 및 변위에 관한 연구)

  • Park, Yeong-Mog;Chung, Youn-In
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.7 no.3
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    • pp.215-222
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    • 2003
  • Recently the deep and large excavations are performed near the existing buildings in urban areas for the practical use of underground space. The earth pressure due to the excavation are varied according to the conditions of ground, the depth of excavation, the construction methods, and the method of supporting the earth pressure etc.. In this study, not only the behavior of axial load and distribution of earth pressure on the flexible wall according to stage excavation depth but also magnitude and distribution of lateral deformation, and the equivalent earth pressure from strut axial loads were analyzed by the results measured from instruments such as, load cells, strain gauges, and in-situ inclinometer, on the field of subway construction. According to the results of this study in the case of stage excavation the earth pressure of soft clayey soil is compounded with Terzaghi-Peck and Tschebotarioff.

An Evaluation on Punching Shear Capacity of R/C Flat Plate Slab (RC 플랫 플레이트 슬래브의 뚫림전단성능평가)

  • Kim, Jong-Keun;Shin, Sung-Woo;Yang, Ji-Soo;Lee, Li-Hyung
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.7 no.3
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    • pp.205-213
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    • 2003
  • The primary purpose of this study is to investigate punching shear capacity of flat plate slab using high strength concrete in column. It may be much contributed to economy efficiency and structural advantages that High Strength Concrete(HSC) used for vertical member and Normal Strength Concrete(NSC) for horizontal member. Therefore, six plate flat slab specimens with HSC column and NSC slab had been made and tested with real scale. The major variables were compressive strength of concrete(fck=285, 460kgf/cm2), extended length of HSC from column face and amount of shear reinforcements. As the result of this test, the maximum load and punching shear capacity of specimens is affected by extended length and shear reinforcements.

Behavior Analysis Using FEM for Earth Retaining Wall of Soft Rock Fracture Zone (FEM을 이용한 연암 파쇄대 지반의 흙막이 벽체 거동 분석)

  • Jang, Gi-Soo;Park, Min-Chul;Shin, Hyo-Hee;Lee, Song
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.17 no.4
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    • pp.30-37
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    • 2013
  • A soft rock fracture zone is an important element for rock slope or earth retaining, however stability studies of earth retaining wall have been lack. Therefore, this study is analyzed for a behavior of earth retaining wall with condition of fracture zone or no fracture zone and then a numerical analysis (Finite Element Method) was performed considering interaction with field monitoring data between ground and structures. As a result, applied horizontal displacement on retaining wall is correspond between result of numerical analysis and field monitoring data and displacement point stress distribution with fracture zone condition analyzed to be stable side but no fracture zone condition is expressed to be unstable side. The results of this study is purpose for applying safety construction as a top priority at field when designing for future.

Static Test and Suggestion of Shear Strength Equation on Shear Studs in Composite Bridge (합성형 교량에서 전단연결재에 대한 정적실험 및 강도식의 제안)

  • Yi, Seong-Tae
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.22 no.2
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    • pp.43-50
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    • 2018
  • In this study, to investigate the shear connection material for the composite of steel plate and bottom plate, design standards and research cases for shear connectors in various countries around the world were analyzed and shear tests were performed on the Push-out specimens with a shear connection, which transmits the horizontal shear force developed on the contact surface between the steel plate and the concrete slab due to various vertical loads acting on the bridge deck. Through Push-out tests of shear studs, of which FRP bar instead reinforcement is placed, the shear stud evaluation formula of the steel strap bottom plate was suggested. The suggested equation suggested in this study has the safety factor of approximately three times compared to allowable strength of highway bridge design criteria. In addition, compared to existing DIN standards and Viest assessment equation, the results showed similar values(approximately, 5% error).

Histological Characteristics of Korean Red Ginseng in Steaming Processes (증숙과정에서 고려인삼의 조직학적 특성)

  • Kim, Chun-Suk;Jang, Dae-Sig;Che, Sun-Yong
    • Korean Journal of Medicinal Crop Science
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    • v.14 no.1
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    • pp.36-40
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    • 2006
  • This study was carried out to investigate histological characteristics of Korean ginseng in steaming process. The Korean red ginseng were prerared with 6-years-old ginseng according to the steaming prcess and dried with 13±0.5 moisture and than cut in vertical section and horizontal section. The tissues are separated into epidermis, cortex, and xylem observed with Scanning Electron Microscope. The materials dried without steaming process contain cell membrane and crystallization of starch particle within them. But Korean red ginseng with prolonged steaming process are condensed, and the large hollows and cell membranes of vessel and resin duct are disappeared. In addition, Ca-oxalate rosette crystal is not found in the case of above 60-minute steaming time. The reason is that the tissues are condensed because of dry after elements' gelatinization.

An Experimental Study on Development Connection System of Concrete Barrier in Modular Bridges (조립식교량의 콘크리트 방호울타리 연결시스템 개발을 위한 실험적 연구)

  • Jung, Ho Sung;Lee, Sang Seung;Choi, Jin Woong;Kim, Tae Wan;Park, Sun Kyu
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.16 no.2
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    • pp.49-57
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    • 2012
  • Recently, in field of bridge construction, modular technology has been studied to reduce construction period. However, main stream of the study is limited to the pier, girder and deck of bridge, which are huge or main members. Studies on incidental facilities like concrete barrier is out of sight. Thus, in this study, connection system of concrete barrier was developed to apply to modular bridges and static experiment was performed in order to verify structural capability of proposed system. Variables of experiment are composed of bolt direction such as vertical and horizontal. The experimentation due to the designed variables was conducted by comparison with a standard concrete barrier, which is a traditional barrier. As a result, vertical joint way of the bolt showed nearly identical structural performance and healthy to standard specimen's. it can be applied to modular bridges.

A Study on the Influence of Behavior of Underground Cavern to Cavern Size and Joint Orientation (공동 규모와 절리 방향성이 지하공동의 거동에 미치는 영향에 대한 연구)

  • Kim, Sang-Hwan;Shin, Beom-Seok
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.14 no.1
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    • pp.84-92
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    • 2010
  • This paper presents the influence of the underground structure (such as cavern and tunnels) behavior according to the rock joint orientation and underground cavern size. In order to perform this research, numerical and experimental studies are carried out. Stress aspect was assessed by quantitative according two kind of factor. In the experimental study, the laboratory model tests are performed in the several ground conditions with different underground cavern size. The results obtained from the model tests are also verified and evaluated using the numerical analysis. Due to the underground cavern, it is found from this study that the stresses developed in archcrown, side wall of underground are increased with increasing the underground cavern size. It is also investigated that the rock joint direction is one of main influence factor as risk factor, to maintain the underground cavern stability. It may be expected that this research will provide the very useful information to evaluate the underground cavern stability.

A Study on Seismic Protection Equipment for Fire Pipes Installed on Buildings (건축물에 설치되는 소방용 배관의 내진장치에 관한 연구)

  • Lim, Geon-Tae;Lim, Sang-Ho
    • Industry Promotion Research
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    • v.4 no.1
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    • pp.1-9
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    • 2019
  • This study is a technology related to a seismic protection device for a fire pipe for installation in a building such as an apartment or a building. The fire pipe is fixed to the base panel by fastening bolts so as to flow left and right. The present invention relates to an earthquake-resistant apparatus for a fire-extinguishing piping, which is capable of minimizing damages caused by an earthquake in order to prevent damages and breakage of a fire-extinguishing pipe by mitigating earthquakes, vibrations, It is connected to an insert plate embedded in concrete or ceiling hanger bolts formed at regular intervals on the ceiling to keep the piping constant from the ceiling and to keep the horizontal condition of the piping always constant so that the piping relaxes or sags And to effectively prevent damage to the piping. The can get.