• Title/Summary/Keyword: iso-beam

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An Analytic Method for the Residual Strength Evaluation of Fire-Damaged Reinforced Concrete Beam

  • Park, Won-jun;Park, Ki-bong;Lee, Han-seung
    • Architectural research
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    • v.10 no.2
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    • pp.37-42
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    • 2008
  • This study is to get the proper evaluation of the residual property of reinforced concrete beam exposed to fire. This study focused on the strength resistance and analytical evaluation of RC members exposed high temperature. And this study is the basis analytical research to conduct the other studies. To analysis by the finite element method, the Total-RC program was used to analysis it and the Total-Temp program was also used to analysis the temperature distributions at the section. All of results were compared with the pre-existing experimental data of simple supported beam. Using it, the parameters influencing the structural capacity of the high temperature-damaged RC members and residual strength estimation are investigated. The temperature distribution and the structural capacity at the section are calculated in this step. An application of this method is compared with the heating test result and residual property test for simple supported beam which is subjected to ISO 834 test fire. The results of this study are as follows; 1) The loads-displacement relationship of RC beam, considering initial thermal stress of cross section and heat transfer analysis are estimated comparing analytical value with pre-existing experimental results. 2) by the heating time (0, 1, 2 hours), the results of analysis with parameters show that the load capacity exposing at fire is affected.

Study on Structural Analysis of DCB Specimen Bonded with Aluminum Foam Composite (알루미늄 폼 복합재료로 된 접합된 DCB 시험편의 구조 해석에 관한 연구)

  • Choi, Hae-Kyu;Kim, Sei-Hwan;Cho, Jae-Ung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.4
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    • pp.1488-1495
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    • 2012
  • In this study, the fracture behaviour of DCB(double cantilever beam) specimen with aluminum foam composite materials is analyzed by simulation. The used model is 3D configuration on the basis of British industrial standard and ISO international standard. As the thickness of model is increased, the length of propagated crack is increased and the load becomes higher. The analysis result obtained by this study can be applied at the practical composite structure bonded with aluminum foam materials. The fracture behaviour is analyzed and the mechanical property can be understood.

A Study on Superficial Dose of 6MV-FFF in HalcyonTM LINAC: Phantom Study (HalcyonTM 선형가속기 6MV-FFF 에너지의 표재 선량에 대한 고찰: Phantom Study)

  • Choi, Seong Hoon;Um, Ki Cheon;Yoo, Soon Mi;Park, Je Wan;Song, Heung Kwon;Yoon, In Ha
    • The Journal of Korean Society for Radiation Therapy
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    • v.32
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    • pp.31-39
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    • 2020
  • Purpose: The aims of this study were to compare the superficial dose with Optically Stimulated Luminescence Dosimeter(OSLD) measurement and Treatment Planning System(TPS) calculation for 6MV-Flattening Filter Free(FFF) energy using HalcyonTM and TrueBeamTM. Materials and methods: Phantom study was performed using the CT images of human phantom. In the treatment planning system, the Planning Target Volume(PTV) was contoured which is similar to Glottic cancer. Furthermore, Point(M), Point(R), and Point(L) were contoured at the iso-center of head and neck region and 5mm bolus was applied to the body contour. Each treatment plans using 6MV-FFF energy from HalcyonTM and TrueBeamTM with static Intensity Modulated Radiation Therapy(IMRT) and Volumetric Modulated Arc Therapy(VMAT) were established with eclipse. To reproduce the same position as the TPS, OSLDs were placed at the iso-center point and 5mm bolus was applied to compare the error rate after the dose delivery. Result: The results of the study using human phantom are as follows. In case of HalcyonTM, the mean absolute error rates of the point dose using the treatment planning system and the dose measured by OSLD were 1.7%±1.2% for VMAT and 4.0±2.8% for IMRT. Also TrueBeamTM was identified as 2.4±0.4% and 8.6±1.8% respectively for VMAT and IMRT. Conclusion: Through the results of this study, TrueBeamTM confirmed that the average error rate was 2.4 times higher for VMAT and 3.6 times higher for IMRT than HalcyonTM. Therefore, based on the results of this study, If we need a more accurate dose assessment for the superficial dose, It is expected that using HalcyonTM would be better than TrueBeamTM.

Study on the Fire Behaviour of Composite Beam (H형강 합성보의 화재거동에 관한 실험적 연구)

  • Kim, Sung-Bae;Choi, Seung-Kwan;Han, Sang-Hoon
    • Fire Science and Engineering
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    • v.22 no.2
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    • pp.84-90
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    • 2008
  • This paper aims to experimentally investigate the in-fire performance of composite beams with respect to the effects of load ratio and shear interaction. Under a Standard ISO834 fire, the development of temperature and deflection of simply supported composite beams were recorded. In particular, the transition of temperature distribution across the cross-section. The fire resistance of composite beam was interpreted regarding the level of shear interaction.

Fire Resistance of U-shape Hybrid Composite Beam (신형상 U형 하이브리드 합성보의 내화성능에 관한 연구)

  • Kim, Sung Bae;Kim, Sang Seup;Ryu, Deog Su;Choi, Seng Kwan
    • Journal of Korean Society of Steel Construction
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    • v.25 no.4
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    • pp.379-388
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    • 2013
  • This paper aims to experimentally investigate the fire resistance of U-shaped hybrid composite beams protected by spay and paint insulations. Subjected to two and three hours of the Standard ISO fire, the flexural performance of 4.4m beams with/without imposed loadings was examined with respect to failure criteria such as deflection and deflection rate of the mid-span and temperatures measured in the steel section. The results demonstrated that the proposed configuration of the composite beam is able to achieve a very competitive 3-hour fire resistance rating in economical aspects.

Calculation of X-ray spectra characteristics and kerma to personal dose equivalent Hp(10) conversion coefficients: Experimental approach and Monte Carlo modeling

  • Arectout, A.;Zidouh, I.;Sadeq, Y.;Azougagh, M.;Maroufi, B.;Chakir, E.;Boukhal, H.
    • Nuclear Engineering and Technology
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    • v.54 no.1
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    • pp.301-309
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    • 2022
  • This work aims to establish some X-ray qualities recommended by the International Standard Organization (ISO) using the half-value layer (HVL) and Hp(10) dosimetry approaches. The HVL values of the following qualities N-60, N-80, N-100, N-150 and N-250 were determined using various attenuation layers. The obtained results were compared to those of reference X-ray beam qualities and a good agreement was found (difference less than 5% for all qualities). The GAMOS (Geant4-based Architecture for Medicine-Oriented Simulations) radiation transport Monte Carlo toolkit was employed to simulate the production of X-ray spectra. The characteristics HVLs, mean energy and the spectral resolution of simulated spectra have been calculated and turned out to be conform to the ISO reference ones (difference less than the limit allowed by ISO). Furthermore, the conversion coefficients from air kerma to personal dose equivalent for simulated and measured spectra were fairly similar (the maximum difference less than 4.2%).

A Study of Inspection of Weld Bead Defects using Laser Vision Sensor (레이저 비전 센서를 이용한 용접비드의 외부결함 검출에 관한 연구)

  • 이정익;이세헌
    • Journal of Welding and Joining
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    • v.17 no.2
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    • pp.53-60
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    • 1999
  • Conventionally, CCD camera and vision sensor using the projected pattern of light is generally used to inspect the weld bead defects. But with this method, a lot of time is needed for image preprocessing, stripe extraction and thinning, etc. In this study, laser vision sensor using the scanning beam of light is used to shorten the time required for image preprocessing. The software for deciding whether the weld bead is in proper shape or not in real time is developed. The criteria are based upon the classification of imperfections in metallic fusion welds(ISO 6520) and limits for imperfections(ISO 5817).

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A Study on Prediction Techniques about Fire Resistance of Modular Beam in ISO Fire (표준화재조건 모듈러보 내화성능 예측기법에 관한 연구)

  • Kim, Hyung-Jun;Kim, Heung-Youl;Kim, Gyeong-Ok
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2008.11a
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    • pp.518-523
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    • 2008
  • The modular beam made of steel material is wholly responsible for the load stress of the structure, therefore securing the fire-resistant capacity of the steel beam is absolutely important. The economic efficiency achieved by minimizing the thickness of the fire-resistant board attached, is also essential at the same time. Accordingly, a study of optimization of the thickness and interval of fire-resistant boards shall be conducted side by side. Therefore, in this study we have anticipated fire-resistant capacity by using a general-purpose S/W for finite elements, ABAQUS(6.7.1), in order to propose the configurable conditions that can secure the optimal fire-resisting capacity of modular beam. As a result of this analysis, it was impossible to secure the fire-resistance capacity when directly attaching fire-resistant board(30mm) on the modular board in accordance with KS F 2257-1, and the fire-resistant boards were manufactured in shape of module in consideration of its installation interval rather than direct application.

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Application of CRAMPS for a Phase Transition in H+-ion irradiated TlH2PO4

  • Kim, Se-Hun;Han, J.H.;Lee, Cheol-Eui;Lee, Kwang-Sei;Kim, Chang-Sam;Dalal, N.S.;Han, Doug-Young
    • Journal of the Korean Magnetic Resonance Society
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    • v.14 no.2
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    • pp.134-143
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    • 2010
  • We studied the hydrogen-bonded $TlH_2PO_4$ (TDP) ferroelectrics treated with the proton-beam bombardment. The TDP material was irradiated with 1-MeV proton beam at a dose of $10^{15}/cm^2$. In order to analyze the hydrogen environment in TDP, we carried out the $^1H$ high resolution nuclear magnetic resonance (NMR) - i.e., Combined Rotation And Multiple Pulse Spectroscopy (CRAMPS) measurement. The isotropic chemical shift of hydrogen indicates its displacive property is related to the $PO_4$ lattice deformation which occurs throughout the antiferroelectric-, the ferroelastic- and the paraelastic-phase transitions. The temperature dependence of $\sigma_{iso}$ reveals the electronic charge redistribution is induced by the proton-beam irradiation and the elastic property.

The Research Relating to QA of the Absorbed Dose in the 10 MeV E-beam Facility in Accordance with the International Standards (국제표준에 따른 10 MeV급 전자빔 조사시설의 흡수선량 품질보증에 관한 연구)

  • Ha, Tae-Sung;Ahn, Cheol;Jung, Pyeong-Hwan;Cho, Jeong-Hee;Lee, Jong-Seok;Lee, Hye-Nam;Yoo, Beong-Gyu
    • Journal of radiological science and technology
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    • v.33 no.4
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    • pp.387-394
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    • 2010
  • In the field of healthcare, the conventional sterilization treatments have been replaced by irradiation methods which are in accordance with internationally well established quality standards. The quality control in radiation sterilization assures that the absorbed dose of the irradiated material is in agreement with its requirements and standards. The electron beam irradiation requires technical assessments of more process parameters than gamma irradiation does. Korea has witnessed wide uses of electron accelerators since early 2000 but there hasn't been research experiences relating to quality system in accordance with international standards. The new large scale e-beam irradiation system with the specification of 10 MeV, 8 kW was installed and operated in 2008 by Seoul Radiology Services Co. It consists of the electron accelerator, product handling system, safety, documentation and control subsystems into an integrated system to meet the requirement of the Good Manufacturing Practice such as process quality assurance and management of product tracking records. To implement the international standard such as EN ISO11137, it is necessary to understand the purposes aimed in the standard and carry out the tests following the procedures required. This study presented the specification of the e-beam facility and showed what its design requirements and features are. The test results on a variety of process parameters were presented and validated it they are within the required limits.