• Title/Summary/Keyword: dynamic column

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Dynamic Adsorptive Characteristics of Dual Adsorbents Bed Packed with Activated Carbon and Zeolite 13X for Benzene Adsorption (활성탄 및 제올라이트 13X를 충진한 이중흡착층 내에서 벤젠의 동적흡착 특성)

  • Kang, Sung-Won;Suh, Sung-Sup;Min, Byung-Hoon
    • Clean Technology
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    • v.10 no.3
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    • pp.159-168
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    • 2004
  • Benzene adsorption experiment was carried out for activated carbon and zeolite 13X adsorbents. Single column and dual column packed with two adsorbents were used to investigate the dynamic adsorptive characteristics. Effect of feed flow rate on the breakthrough curve was not significant. Specific adsorption amount of benzene for activated carbon was larger than that for zeolite 13X. On the contrary, adsorption amount per column volume was larger for zeolite 13X column because the density of zeolite 13X was larger. In the dynamic experiment using dual adsorbents column, length of mass transfer zone was changed by the feed direction. Breakthrough time was longer and breakthrough curve was sharper when activated carbon was packed in feed inlet and zeolite 13X was packed in column outlet. Also breakthrough time and breakthrough curve slope were affected by the packing ratio of the two adsorbents.

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Theoretical study of UHPCC composite column behaviors under axial compression

  • Wu, Xiang-Guo;Zou, Ruofei;Zhao, Xinyu;Yu, Qun
    • Structural Engineering and Mechanics
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    • v.55 no.5
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    • pp.931-951
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    • 2015
  • To improve the durability and service life of reinforced concrete column such as bridge piers, an advanced composite column made of Ultra High Performance Cementitious Composites (UHPCC) permanent form is proposed. Based on elasticity plasticity theory, axial compression behavior of the composite column was studied theoretically. The first circumferential cracking load and ultimate limit loading capacity are derived for the composite column. Short composite column compression tests and numerical simulations using FEM method were carried out to justify the theoretical formula. The effects of UHPCC tube thickness on the axial compression behavior were studied. Using the established theoretical model and numerical simulation, the large dimension composite columns are calculated and analyzed with different UHPCC tube thickness. These studies may provide a reference for advanced composite column design and application.

Research of geothermal analysis and experimental test for Standing Column Well type system (우물관정(SCW: Standing Column Well)형 냉난방 시스템의 지중열 해석과 실증 실험에 관한 연구)

  • Kwon, Iksang;Hong, Gibae
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.06a
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    • pp.173-173
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    • 2010
  • This thesis identified basic design elements (Sustainable Yield, Temperature of Groundwater, Depth of Well, Separation Distance between wells) regarding installation of Standing Column Well, Geothermal Heat pump System by dynamic analysis.

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Research for geothermal analysis on design of Standing Column Well type system (우물관정(SCW: Standing Column Well)형 지열 냉난방 시스템 설계를 위한 지중열 해석에 관한 연구)

  • Kwon, Ik-Sang;Rhee, Kwon-Joong;Kim, Tae-Won
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.576-580
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    • 2009
  • This thesis identified basic design elements(Sustained Yield, Depth of Well, Separation Distance between wells) regarding installation of Standing Column Well, Geothermal Heat pump System by dynamic analysis.

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Global seismic performance of a new precast CFST column to RC beam braced frame: Shake table test and numerical study

  • Xu, S.Y.;Li, Z.L.;Liu, H.J.
    • Steel and Composite Structures
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    • v.21 no.4
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    • pp.805-827
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    • 2016
  • A new type of precast CFST column to RC beam braced frame is proposed in this paper. A series of shake table tests were conducted to excite a one-third scale six-story model for investigating the global seismic performance of this type of structure against earthquake actions. Particular emphasis was given to its dynamic property, global seismic responses and failure path. Correspondingly, a numerical model built on the basis of fiber-beam-element model, multi-layer shell model and element-deactivation method was developed to simulate the seismic performance of the prototype structure. Numerical results were compared with the measured values from shake table tests to verify the validity and reliability of the numerical model. The results demonstrated that the proposed novel precast CFST column to RC beam braced frame performs excellently under strong earthquake excitations; the "strong CFST column-weak RC beam" and "strong connection-weak member" anti-seismic design principles can be easily achieved; the maximum deflections of precast CFSTC-RCB braced frame satisfied the deflection limitations proposed in national code; the numerical model can properly simulate the dynamic property and responses of the precast CFSTC-RCB braced frame that are highly concerned in engineering practice.

A Study on the Vibration Analysis of an Automobile Steering System (승용차 스티어링 칼럼 시스템의 진동해석에 관한 연구)

  • 김찬묵;김도연
    • Journal of KSNVE
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    • v.8 no.3
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    • pp.494-503
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    • 1998
  • In this paper, in order to analyze dynamic characteristics of an automobile steering system consisting of many components, natural frequencies and transfer functions of each component and the total system are found on a FFT analyzer by experiments. Then, the data are transmitted to a commercial package program, CADA-PC. By analyzing the data, the mode shape of each natural frequency and damping values are obtained. Also, the function of a rubber coupling in column and telescoping effects on system are considered. C.A.E commercial programs are used to compare with the results of experiments. For the finite element modeling, I-DEAS is used. Data processing and post processing are operated on NASTRAN and XL, respectively. The ball-bearing and the linkage of shaft with column are modeled by spring element. Stiffness is modified from the results of experiments. The results of those show close agreement. In the mode shape of total system, wheel mode is dominant at lower frequency, while the column mode is main mode at higher. The role of rubber coupling in vibration isolation is clear on mode shape. Telescoping function makes natural frequency of column changed.

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Dynamic Properties of Hydraulic Mechanically Stabilized Slag as Railroad Material (철도노반재로서 수경성입도조정고로슬래그의 동적 물성특성)

  • 황선근;이일화;이성혁;최찬용
    • Proceedings of the Korean Geotechical Society Conference
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    • 1999.03a
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    • pp.391-398
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    • 1999
  • Dynamic properties of hydraulic mechanically stabilized slag(HMS25) was studied for utilizing it as a roadbed material. HMS25 is a by product material during pig iron production process. It has a very good potential application as a roadbed material. Therefore, the resonant column and torsional shear tests were carried out to evaluate the dynamic properties of HMS25 which are necessary for designing roadbed of railroad track. As a result, it was found that HMS25 has excellent dynamic properties required for roadbed material used in railroad track.

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Deformational Characteristics of Dry Sand Using Resonant Column / Torsional Shear Testing Equipment (공진주/비틂 전단(RC/TS)시험기를 이용한 건조 사질토의 변형특성)

  • 김동수
    • Geotechnical Engineering
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    • v.11 no.1
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    • pp.101-112
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    • 1995
  • Deformational characteristics of soils, often expressed in terms of shear modulus and material damping ratios, are important parameters in the design of soil-structure systems subjected to cyclic and dynamic loadings. In this paper, deformational characteristics of dry sand at small to intermediate strains were investigated using resonant column/torsional shear(RC 175) apparatus. Both resonant column(dynamic) and torsional shear (cyclic) tests were performed in a sequential series on the same specimen. With the modification of motion monitoring system, the elastic zone, where the stress strain relationship is independent of loading cycles and strain amplitude, was veri tied and hysteretic damping was found even in this zone. At strains above cyclic threshold, shear modulus increases and damping ratio decreases with increasing number of loading cycles. Moduli and damping ratios of dry sand are independent of loading frequency and values obtained from pseudostatic torsional shear tests are Identical with the values from the dynamic resonant column test, provided the effect of number of loading cycles is considered in the conlparison. Therefore, deformational characteristics determined by RC/TS tests may be applied in both dynamic and static analyses of soil-structure systems.

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Seismic Object Performance Evaluation of Braced Steel Moment Resisting Frames with Low Rise Building under Different Site Stiffness (지반강성을 고려한 중저층 가새모멘트저항골조의 내진 목표성능평가)

  • Kim, Soo Jung;Choi, Byong Jeong;Park, Ho Young;Lee, Jinwoo
    • Journal of the Earthquake Engineering Society of Korea
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    • v.20 no.2
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    • pp.91-101
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    • 2016
  • This study is the compared seismic performance that are difference between the performance of structures on various site classes and beam-column connection. this analysis model was designed the previous earthquake load. To compare the performance levels of the structure was subjected to nonlinear static and nonlinear dynamic analysis. Nonlinear analysis was used to The Perform 3D program. Nonlinear static analysis was compared with the performance point and Nonlinear dynamic analysis was compared the drift ratio(%). Analysis results, the soft site class of the displacement was more increase than rock site classes of the displacement. Also The smaller the displacement was increased beam-column connection stiffness.

Response of a rectangular plate-column system on a tensionless Winkler foundation subjected to static and dynamic loads

  • Guler, K.;Celep, Z.
    • Structural Engineering and Mechanics
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    • v.21 no.6
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    • pp.699-712
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    • 2005
  • The response of a plate-column system having five-degree-of-freedom supported by an elastic foundation and subjected to static lateral load, harmonic ground motion and earthquake motion is studied. Two Winkler foundation models are assumed: a conventional model which supports compression and tension and a tensionless model which supports compression only. The governing equations of the problem are obtained, solved numerically and the results are presented in figures to demonstrate the behavior of the system for various values of the system parameters comparatively for the conventional and the tensionless Winkler foundation models.