• Title/Summary/Keyword: Hybrid column

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Prediction and Measurement of Differential Column Shortening in High-rise Building Structures (고층건물의 부등축소량 예측 및 계측)

  • 정금진;양근혁;이정한;홍재원;이원호;정헌수
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10a
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    • pp.511-516
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    • 2000
  • A Hybrid Wall System(HWS) building, Kolon Bundang Tripolis was instrumented to measure the vertical deformation of core-walls and columns. The vertical shortening of individual members were measured at selected floor levels such as 1F, 12F, 25F, and 34F. The measurement has been taken during one year after the construction was started. Together with the measurement, concrete property tests were performed in the laboratory using the concrete obtained in the field. The measured vertical shortenings were compared with the calculated prediction values and the satisfactory agreement was obtained.

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Preparation of High Performance Hybrid Chemical Filter using Hot Melt Adhesive by Web Spray and Their Adsorption Properties (핫멜트 Web spray법을 이용한 고기능성 복합 화학필터의 제조 및 흡착특성)

  • Choi, Yong Jae;Shin, Kyoung Sub;Hwang, Taek Sung
    • Journal of Adhesion and Interface
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    • v.10 no.3
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    • pp.141-147
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    • 2009
  • In this study, the high performance hybrid chemical filter (HPHCF) was prepared by web spray using hot melt adhesive. The material of HPHCF was conditionally made of ion exchange resin and PP non-woven fabric. The optimum temperature and pressure for manufacturing of HPHCF conditions were such as $170^{\circ}C$ and 50 psi, respectively. The characteristics of preparated HPHCF and their adsorption properties of ammonia gas were investigated. The ion exchange capacity (IEC) of HPHCF was increased with increasing the resin contents and their values were higher than pure resin and ion exchange fabrics. The removal efficiency for ammonia gas increased with the increase of packing density of hybrid ion exchange fabrics in the column. It showed 13 min which the adsorption breakthrough time was slower than resin and fibers. The maximum value of adsorption for ammonia gas was 98 percent. And also, the velocity was increased with increasing concentration and flow rate of ammonia gas.

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Preparation of Hybrid Cation Ion Exchange Fibers by Web Spray and Their Adsorption Properties for Ammonia Gas (Web Spray 법을 이용한 복합 양이온교환섬유의 제조 및 암모니아 흡착특성)

  • Park, Seong-Wook;Lee, Hoo-Kun;Rhee, Young-Woo;Jung, Boo-Young;Hwang, Taek-Sung
    • Polymer(Korea)
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    • v.31 no.6
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    • pp.479-484
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    • 2007
  • In this study, the hybrid ion exchange fibers (HIEF) were prepared by using web spraying muthod with hot melt adhesive. Characteristics of HIEF and their adsorption properties for ammonia gas were investigated. The ion exchange capacity (IEC) of HIEF was increased with increasing the resin contents and their values were higher than those of pure resin and ion exchange fabrics. The removal efficiency for ammonia gas increased with an increase in packing density of hybrid ion exchange fabrics in the column. The adsorption breakthrough time was 270 min, which was slower than those of the resin and fibers. The maximum value of adsorption for ammonia gas was 94%. The breakthrough time was also increased with increasing the concentration and flow rate of ammonia gas. The reaction constant(k) for ammonia gas was increased with increasing the concentration and flow rate of the gas, while it was decreased an the mass was increased.

Facility to study neutronic properties of a hybrid thorium reactor with a source of thermonuclear neutrons based on a magnetic trap

  • Arzhannikov, Andrey V.;Shmakov, Vladimir M.;Modestov, Dmitry G.;Bedenko, Sergey V.;Prikhodko, Vadim V.;Lutsik, Igor O.;Shamanin, Igor V.
    • Nuclear Engineering and Technology
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    • v.52 no.11
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    • pp.2460-2470
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    • 2020
  • To study the thermophysical and neutronic properties of thorium-plutonium fuel, a conceptual design of a hybrid facility consisting of a subcritical Th-Pu reactor core and a source of additional D-D neutrons that places on the axis of the core is proposed. The source of such neutrons is a column of high-temperature plasma held in a long magnetic trap for D-D fusionreactions. This article presents computer simulation results of generation of thermonuclear neutrons in the plasma, facility neutronic properties and the evolution of a fuel nuclide composition in the reactor core. Simulations were performed for an axis-symmetric radially profiled reactor core consisting of zones with various nuclear fuel composition. Such reactor core containing a continuously operating stationary D-D neutron source with a yield intensity of Y = 2 × 1016 neutrons per second can operate as a nuclear hybrid system at its effective coefficient of neutron multiplication 0.95-0.99. Options are proposed for optimizing plasma parameters to increase the neutron yield in order to compensate the effective multiplication factor decreasing and plant power in a long operating cycle (3000-day duration). The obtained simulation results demonstrate the possibility of organizing the stable operation of the proposed hybrid 'fusion-fission' facility.

Properties of TiN Films Fabricated by Oblique Angle Deposition (빗각 증착으로 제조된 TiN 박막의 특성)

  • Jung, Jae-Hun;Yang, Ji-Hoon;Park, Hye-Sun;Song, Min-A;Jeong, Jae-In
    • Journal of the Korean institute of surface engineering
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    • v.45 no.3
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    • pp.106-110
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    • 2012
  • Oblique angle deposition (OAD) is a physical vapor deposition where incident vapor flux arrives at non-normal angles. It has been known that tilting the substrate changes the properties of the film, which is thought to be a result of morphological change of the film. In this study, OAD has been applied to prepare single and multilayer TiN films by cathodic arc deposition. TiN films have been deposited on cold-rolled steel sheets and stainless steel sheet. The deposition angle as well as substrate temperature and substrate bias was changed to investigate their effects on the properties of TiN films. TiN films were analyzed by color difference meter, scanning electron microscopy, nanoindenter and x-ray diffraction. The color of TiN films was not much changed according to the deposition conditions. The slanted and zigzag structures were observed from the single and multilayer films. The relation between substrate tilting angle (${\alpha}$) and the growth column angle (${\beta}$) followed the equation of $tan{\alpha}=2tan{\beta}$. The indentation hardness of TiN films deposited by OAD was low compared with the ones prepared at normal angle. However, it has been found that $H^3/E^2$ ratio of 3-layer TiN films prepared at OAD condition was a little higher than the ones prepared at normal angle, which can confirm the robustness of prepared films.

Investigation of the Effect of Calculation Method of Offset Correction Factor on the GEMS Sulfur Dioxide Retrieval Algorithm (GEMS 이산화황 산출 현업 알고리즘에서 오프셋 보정 계수 산정 방법에 대한 영향 조사)

  • Park, Jeonghyeon;Yang, Jiwon;Choi, Wonei;Kim, Serin;Lee, Hanlim
    • Korean Journal of Remote Sensing
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    • v.38 no.2
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    • pp.189-198
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    • 2022
  • In this present study, we investigated the effect of the offset correction factor calculation method on the sulfur dioxide (SO2) column density in the SO2 retrieval algorithm of the Geostationary Environment Monitoring Spectrometer (GEMS) launched in February 2020. The GEMS operational SO2 retrieval algorithm is the Differential Optical Absorption Spectroscopy (DOAS) - Principal Component Analysis (PCA) Hybrid algorithm. In the GEMS Hybrid algorithm, the offset correction process is essential to correct the absorption effect of ozone appearing in the SO2 slant column density (SCD) obtained after spectral fitting using DOAS. Since the SO2 column density may depend on the conditions for calculating the offset correction factor, it is necessary to apply an appropriate offset correction value. In this present study, the offset correction values were calculated for days with many cloud pixels and few cloud pixels, respectively. And a comparison of the SO2 column density retrieved by applying each offset correction factor to the GEMS operational SO2 retrieval algorithm was performed. When the offset correction value was calculated using radiance data of GEMS on a day with many cloud pixels was used, the standard deviation of the SO2 column density around India and the Korean Peninsula, which are the edges of the GEMS observation area, was 1.27 DU, and 0.58 DU, respectively. And around Hong Kong, where there were many cloud pixels, the SO2 standard deviation was 0.77 DU. On the other hand, when the offset correction value calculated using the GEMS data on the day with few cloud pixels was used, the standard deviation of the SO2 column density slightly decreased around India (0.72 DU), Korean Peninsula (0.38 DU), and Hong Kong (0.44 DU). We found that the SO2 retrieval was relatively stable compared to the SO2 retrieval case using the offset correction value on the day with many cloud pixels. Accordingly, to minimize the uncertainty of the GEMS SO2 retrieval algorithm and to obtain a stable retrieval, it is necessary to calculate the offset correction factor under appropriate conditions.

Cyclic behavior of steel beam-concrete wall connections with embedded steel columns (II): Theoretical study

  • Li, Guo-Qiang;Gu, Fulin;Jiang, Jian;Sun, Feifei
    • Steel and Composite Structures
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    • v.23 no.4
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    • pp.409-420
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    • 2017
  • This paper theoretically studies the cyclic behavior of hybrid connections between steel coupling beams and concrete shear walls with embedded steel columns. Finite element models of connections with long and short embedded steel columns are built in ABAQUS and validated against the test results in the companion paper. Parametric studies are carried out using the validated FE model to determine the key influencing factors on the load-bearing capacity of connections. A close-form solution of the load-bearing capacity of connections is proposed by considering the contributions from the compressive strength of concrete at the interface between the embedded beam and concrete, shear yielding of column web in the tensile region, and shear capacity of column web and concrete in joint zone. The results show that the bond slip between embedded steel members and concrete should be considered which can be simulated by defining contact boundary conditions. It is found that the loadbearing capacity of connections strongly depends on the section height, flange width and web thickness of the embedded column. The accuracy of the proposed calculation method is validated against test results and also verified against FE results (with differences within 10%). It is recommended that embedded steel columns should be placed along the entire height of shear walls to facilitate construction and enhance the ductility. The thickness and section height of embedded columns should be increased to enhance the load-bearing capacity of connections. The stirrups in the joint zone should be strengthened and embedded columns with very small section height should be avoided.

Single Degree of Freedom Hybrid Dynamic Test with Steel Frame Structure (강 뼈대 구조물의 단자유도 하이브리드 동적 실험)

  • Kim, Se-Hoon;Na, Ok-Pin;Kim, Sung-Il;Lee, Jae-Jin;Kang, Dae-Hung
    • Journal of the Korean Society for Railway
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    • v.15 no.4
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    • pp.413-421
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    • 2012
  • The purpose of this study is to evaluate the structural dynamic behavior under hybrid control system. The hybrid test is to consider the interaction between the numerical and physical models. In this paper, single degree of freedom hybrid test was performed with one-bay, two-story steel frame structure. One column at the first floor was selected as a physical substructure and one actuator was used for applying the displacement load in horizontal direction. El Centro as earthquake waves was inputted and OpenSees was employed as the numerical analysis program for the hybrid real-time simulation. As a result, the total time of the hybrid test was about 9.6% of actual measured seismic period. The experimental results agreed well with the numerical one in terms of the maximum displacement. In nonlinear analysis, however, material nonlinearity made a difference of residual strain. Therefore, this hybrid dynamic test can be used to predict the structural dynamic performance more effectively than shaking table test, because of the spatial and economic limitations.

Reversed Cyclic Load Tests on Deep Beam-and-Exterior Column Joints (깊은보-외부기둥 접합부의 반복 횡하중 실험)

  • Ko, Dong-Woo;Lee, Han-Seon
    • Journal of the Korea Concrete Institute
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    • v.19 no.3
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    • pp.265-273
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    • 2007
  • The most common structural system for apartment buildings in Korea is adopted to combine structural systems: for example, a moment-resisting frame will be used for lower stories and bearing wall system for the upper stories. This type of buildings have soft and/or weak stories in lower stories, and it may lead to collapse of those buildings during the large earthquake. Reversed cyclic load tests were conducted to estimate the performance and behavioral characteristics of deep beam and exterior column Joints. Experimental parameter is the amount of transverse reinforcement (designed by ACI code and Sheikh's procedure). The results of this study are as follows: (1) The required transverse reinforcement of column designed by Sheikh's procedure requires 2.9 times larger than that designed by ACI procedure. Large amount of transverse reinforcement increase the ductility of the column. (2) Most of the lateral drift in the column is due to the flexural deformation in the joint and plastic hinge region and up-lift rotation. (3) Transverse reinforcement in the exterior column shall be required not only in the hinge region but also in the joint.

Evaluation on Flexural Behavior of Hybrid Beams with Rigid Joint Connecting Steel and Precast Concrete Elements (강재 보-PC 보가 강접합 연결된 하이브리드 보의 휨 거동 평가)

  • Seo, Eun-A;Yang, Keun-Hyeok;Hong, Seung-Hyun
    • Journal of the Korea Concrete Institute
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    • v.28 no.1
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    • pp.13-21
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    • 2016
  • A hybrid precast concrete beam system with a simple rigid connection was proposed to compensate the limitations and shortcomings of the conventional bolt connection associated with the H-beams embedded into concrete beams. Three beam specimens with fixed both ends were tested under one-point top cyclic loading to explore the effectiveness of the developed hybrid beam system in transferring externally applied flexure to a column. The main parameter considered was the length ($L_s$) of H-beam, which was selected to be $0.25L_I$, $0.5L_I$, and $1.0L_I$, where $L_I$ is the distance from the support to the point of inflection. All beam specimens showed a better displacement ductility ratio than the reinforced concrete beams with the same longitudinal reinforcement index, indicating that the cyclic load-deflection curve and ductility were insignificantly affected by $L_s$. The continuous strain distribution along the beam length and the prediction of the ultimate load based on the collapse mechanism ascertained the structural adequacy of the developed rigid connection.