• Title/Summary/Keyword: location of the bar

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The Development of Flaw Detection in Concrete by the Impact-Echo Testing Method (충격탄성파법을 이용한 콘크리트 내부의 결함탐상 기술개발)

  • 박선균;임창덕
    • Proceedings of the Korea Concrete Institute Conference
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    • 1991.04a
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    • pp.105-110
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    • 1991
  • The conventional high-frequency testing method is difficult to detect flaw in concrete because the high frequency stress wave is strongly attenuated due to the large grain size and heterogeneous structure. For restoration of this problem, we develop the stu요 of flaw detection in large concrete block containing various artificial flaws by low frequency spectrum anlysis of impact-echo waveforms. This impact-echo testing method is possible to determine the flaw size, shape and location in large concrete block even if required some attention in case of containing reinforcing steel bar.

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Flexural-Shear Failure Behavior in I-Shape RC Beams (I형 단면 RC보의 휨-전단파괴 거동에 관한 연구)

  • Moon, Jong-Soo;Yum, Hwan-Seok;Kim, Woo
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.10a
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    • pp.377-380
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    • 1999
  • This paper dscribes an experimental investigation into the cause of flexural-shear failure in RC beams. The experimental variables are bottom flange width and tension bar location. Then these test results were compared and analyzed to deduce the major cause of critical-shear cracking. As a result, it was found that the propagation of the critical shear crack depended exclusively on the intensity of horizontal cracking.

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Effect of Dowel Bar on the transverse joint at the cement concrete pavement by model test (모형실험에 의한 강성포장체 가로줄눈에 다우웰바가 미치는 영향)

  • 배주성;고영주;김평수
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.10b
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    • pp.633-636
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    • 1998
  • The use of concrete pavements is increasing by virtue of durability and excellent load resisting capacity. But cracks and demage in concrete pavements may be occurred by continuous reciclic load, as time goes by. Therefore, transverser contraction joints are constructed in concrete pavements to relieve tensile stresses, and when properly spaced they control the location of transverse cracks.

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Fuzzy data fusion technique for strain measurements (변형도 계측을 위한 퍼지 정보융합 기법)

  • Choi, Ju-Ho;Lyou, Joon
    • Journal of the Korean Institute of Telematics and Electronics B
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    • v.33B no.4
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    • pp.41-51
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    • 1996
  • This paper presents a fuzzy data fusion scheme which can analyze the sensor condition, the strength and location of a force applied to a test material. These can be realized by the modelling and fusioning of sensor signals and sensor properties. The technique uses, as the inference variables, relative magnitude of data (RMD), absolute magnitude of data (AMD) initial state (IS), synchronized relational function (SRF) and asynchronized relational function (ARF). To show the usefulness of this scheme, an experiment on the cantilever bar and six strain gages is carried out. The location of the force is inferred from SRF and ARF and the strength from RMD and AMD. In particular, the strength is compared with the measurement data of the force sensor.

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A Study on the Development of Concrete showing Self-damage (자기 손상을 나타내는 콘크리트의 개발 연구)

  • 박신일;박준영;전철송;임병호;김화중
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10a
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    • pp.129-133
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    • 2000
  • The purpose of this paper is to develope concrete which presents self-damage as soon as the crack by external force occur. In experiment, when concrete specimens inserted glass filled with mixed liquid into were loaded, glass tube was break and crack around became red color. Failure properties were investigated according to type, location of sensor and existence of reinforced bar.

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A Study on Development of Tire Identification System (ICCAS 2005)

  • Lee, Ki-Seong;Jeong, Tae-Woon
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.1917-1921
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    • 2005
  • The Bar code, RFID in the standard recognition method for the goods automation of tire manufacture process, sometimes problem occurs with the damage due to a high tension, high fever. So it has problem that needs many instruments to attach it. In this paper, in the letter of tire's surface the Mold ID which has a specific feature it proposed the algorithm for the location detection of acquisition and Mold ID of the image which uses 3 dimension cameras.. It described the method which recognizes the each letter of Mold ID from the location which is detected.

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New methodology of backbone curve for RC perforated shear walls

  • Yang, Jing-Shyang;Cheng, Franklin Y.
    • Structural Engineering and Mechanics
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    • v.14 no.3
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    • pp.365-380
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    • 2002
  • Following a series of experiments on isolated low-rise RC shear walls with openings, a theoretical study on the backbone curve of a perforated shear wall shows that there are some important observations from experimental results that make clear a semi-empirical formula of the backbone curve of a perforated wall. Critical shear zones can be depicted from the configuration of shear walls with openings. Different factors, including the size and location of shear wall openings, the wall's height/width ratio, horizontal and vertical steel bar ratios, and location and amount of diagonal steel bars are involved in the derivation of the backbone curve. Bending and shear effects are also considered in the paper. In addition, a comparison of load and displacement for solid and perforated shear walls is discussed. Generally, the comparison between experimental curves and computed backbone curves is favorable.

Numerical study on the effects of nozzle geometry and substrate location in the supersonic flow (노즐 형상과 기판의 위치 변화가 초음속 유동에 미치는 영향에 관한 수치해석 연구)

  • Park, Jung Jae;Yoon, Suk Goo;Kim, Ho Young
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.06a
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    • pp.58.2-58.2
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    • 2010
  • This paper deals with the simulation of solid particle coating technology via supersonic nozzle in vacuum environment to devote as an aerosol-deposition device. In order to improve efficiencies of nozzle and coating process, effects of shockwave, nozzle geometry, and substrate location were studied computationally under a fixed chamber pressure of 0.01316 bar which is nearly vacuous. Shockwave is the important factor affect to entire flow because shockwave in the jet flow dissipates the kinetic energy of the flow in the supersonic condition. Results show that various nozzle geometries have significant effect on the supersonic flow and we know that the supersonic nozzle should be optimized to minimize the loss of the flow. Another parameter, the distance between substrate and nozzle tip, shows little effect in this study.

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A Study on the Transitions and Preservation of Namganjeongsa (남간정사의 변천과정과 보존에 관한 연구)

  • Do, Yong Ho
    • Journal of the Korean Institute of Rural Architecture
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    • v.13 no.4
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    • pp.35-42
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    • 2011
  • This thesis investigated construction aims, transitions, and preservation strategies through literatures, old documents, old maps, drawings, and photos and attained results as followings. 'Namganjeongsa' was built and located, centering on the thoughts of 'Song Si Yeol' who adored '$zh{\bar{u}}z{\check{i}}xu{\acute{e}}$'. 'Song Si Yeol' constructed 'Namganjeongsa' on a valley which was situated at a beautiful surrounding with a stream. No writing mentioned that he constructed 'Namganjeongsa', for there was a pond. It seems that the pond was constructed, going through many transitions, after its construction. Neighboing circumstances were damaged when 'Gigukjeong was moved in, 'Namgansa' was constructed, and 'Uamsajeok Park' was formed. So, preservation of cultural assets, together with buildings and environment of location, are meaningful.

Optimization of Handle Vibration of Walking-type Cultivator (보행형 관리기 핸들의 진동 최적화)

  • Park S.B.;Park Y.J.;Kim K.U.
    • Journal of Biosystems Engineering
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    • v.31 no.3 s.116
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    • pp.139-145
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    • 2006
  • A previous study showed that the handle vibration of a walking type cultivator can be reduced by adding a mass to the handle. This study was conducted to determine the optimum magnitude and location of the mass to be added for the same cultivator. The possible locations of added mass were determined by investigating nodal points of the handle vibration by an ODS (operational deflection shapes) test at an engine frequency of 52 Hz. The optimum location was then determined as one that moved the nodal points to the hand grip of the handle bar. To determine the optimum magnitude of the mass, the possible locations were added by a mass from 0.2 to 2.0 kg in an increment of 0.2 kg. The optimum magnitude was then determined as a mass which minimized the vibration level at the hand grip. For the case of this study, the z-axis vibration at the hand grip was reduced from $2.67m/s^2\;to\;0.88m/s^2$ resulting in a reduction of 67% and the total vibration from $4.09m/s^2\;to\;3.27m/s^2$ resulting in a 20% reduction by adding an optimum mass to the optimum location.