• Title/Summary/Keyword: 경제적 단면

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New Suggestion of Effective Moment of Inertia for Beams Reinforced with the Deformed GFRP Rebar (이형 GFRP Rebar로 보강된 보의 유효단면이차모멘트 산정식 제안)

  • Sim, Jong-Sung;Oh, Hong-Seob;Ju, Min-Kwan;Lim, Jun-Hyun
    • Journal of the Korea Concrete Institute
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    • v.20 no.2
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    • pp.185-191
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    • 2008
  • To fundamentally solve the problem of deterioration of concrete structures, it has been researched that the high durable concrete structure reinforced with the FRP rebar can be one of major solution to the newly-developed concrete structure. FRP rebar has lots of advantages such as non-corrosive, high performance and light weight against the conventional steel rebar. Among these kinds of FRP rebars, GFRP rebar has usually been considered as the best reinforcement because of its economic point of view. Even though the material capacity of the GFRP rebar was already investigated, there are some problems such as low modulus of elastic that will be cause for degrade of the serviceability of flexural concrete member reinforced with the GFRP rebar. Thus, the deflection characteristics of the GFRP rebar reinforced concrete structure should be considered then investigated. In this study, ACI 440 guideline (2003), ISIS Canada Design Manual (2001) and Toutanji et al. (2000) was considered for predicting the moment of inertia of the concrete beam reinforced with the GFRP rebar. And it was also evaluated that load-deflection relationship had a good accordance with the test and analysis result. In the result of this study, it could be estimated that the load-deflection relationship using the suggested equation of moment of inertia in this study indicated better accordance with the test result than that of the others until failure.

Restricted partition method and gene-gene interaction analysis with Hanwoo economic traits (제한된 분할방법과 한우 경제형질에서 유전자들간의 상호작용)

  • Lee, Jea-Young;Kim, Dong-Chul
    • Journal of the Korean Data and Information Science Society
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    • v.20 no.1
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    • pp.171-178
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    • 2009
  • In order to make the high quality Korean cattle, it has been identified the gene which influence to various economic characters. In this paper, we introduce Restricted Partition Method for gene-gene interaction analysis. Further, economic traits, longissimus muscle dorsi area (LMA), carcass cold weight (CWT) and average daily gain (ADG) are applied with Restricted Partition Method (RPM). The SNP (19_1)$^*$SNP (28_2) was selected and was best marker on Single nucleotide polymorphisms (SNPs). It also influenced SNP (19_1)$^*$SNP (28_2) was an very important marker for economic character and to make the thing know it became.

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A preliminary study on economical efficiency of a room-and-pillar excavation method in comparison with 2-arch tunnelling method (2아치 터널 굴착 공법과의 비교를 통한 주방식 굴착 공법의 예비 경제성 검토 연구)

  • Lee, Chulho;Chang, Soo-Ho;Ahn, Sung-Youll;Shin, Hyu-Soung
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.15 no.6
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    • pp.599-612
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    • 2013
  • This study aims to investigate an economical efficiency of two excavation methods with respect to the room-and-pillar method for the underground space and conventional excavation method, i.e. 2-arch tunnelling method. For feasibility study, an excavation cost for both room-and-pillar method and 2-arch tunnelling method was estimated when the same space in operation was required. It was assumed that properties of reinforcements and rock were adopted from literatures. However, an excavation shape of the room-and-pillar method was assumed not to be the rectangular shape which is a general type in the room-and-pillar method but to be an arch shape in order to compare with the conventional excavation method (2-arch tunnelling) and to achieve the maximum bearing capacity of the structure during excavation. Consequently, the wider space in use or required and the better condition of rock we assumed, the more economical advantage we have in the room-and-pillar method than the 2-arch tunnelling method.

Analysis of flow conveyance considering the influence of vegetation in the downstream of Soyang reservoir (소양강댐 직하류 하천의 식생영향에 의한 통수능 분석)

  • No, Jun-U;Sin, Hyeon-Ho;Gang, Sin-Uk;Kim, Ho-Jun;Ku, Hye-Jin;Jun, Kyung-Soo
    • Proceedings of the Korea Water Resources Association Conference
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    • 2010.05a
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    • pp.971-976
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    • 2010
  • 과거에는 홍수조절의 관점에서 하도 내 식생은 통수단면적의 축소와 조도상승 등의 문제로 기피의 대상이 되어왔으나 최근 저수지자연하천의 생태계 보전 복원을 통한 하천 환경의 개선, 경제 성장 및 생활환경의 질적 향상에 의한 하천변 경관조성과 휴식처 조성 등 사회적 요구가 증대하여 하도내 식생의 영향을 고려한 하천관리의 중요성이 더욱 강조되고 있다. 본 연구에서는 소양강댐 직하류 하천을 대상으로 홍수기 방류시 식생에 의한 수위변동을 모의함으로써 대상하천의 통수능 검토를 실시하였다. 이를 위하여 대상유역의 식생분포를 현장조사를 통해 파악하였고 단면별 수위상승을 모의하기 위하여 1차원 및 2차원 수리학적 수치모형을 활용하여 식생을 고려한 흐름 해석을 실시하였다.

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An adaptive fuzzy control for closed-die ring-rolling process ("Ring 생산 Control System의 퍼지 적응제어")

  • 이용현
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.1476-1479
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    • 1996
  • The ring rolling process is one of the best known ring production method. The present model based control system was designed for rings with rectangle cross-section yet. An Adaptive Fuzzy Control for Closed-Die Ring-Rolling was developed in order to enhance the flexibility of the radial-axial ring rolling machine and to produce the rings with highly complex cross-section profile, roller bearing rings. A fuzzy method was implemented because of its simple application and to utilize the known process knowledge. The quality of the control system was estimated by die filling grad, which is strong dependent on the rising time of the controller. The rolling process parameters were also varied to determine their influence on filling of the ring profile. Die filling met the requirement of the industry.

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Multifactor Dimensionality Reduction(MDR) Analysis by Dummy Variables (더미(dummy) 변수를 활용한 다중인자 차원 축소(MDR) 방법)

  • Lee, Jea-Young;Lee, Ho-Guen
    • The Korean Journal of Applied Statistics
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    • v.22 no.2
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    • pp.435-442
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    • 2009
  • Multiple genes interacting is a difficult due to the limitations of parametric statistical method like as logistic regression for detection of gene effects that are dependent solely on interactions with other genes and with environmental exposures. Multifactor dimensionality reduction(MDR) statistical method by dummy variables was applied to identify interaction effects of single nucleotide polymorphisms(SNPs) responsible for longissimus mulcle dorsi area(LMA), carcass cold weight(CWT) and average daily gain(ADG) in a Hanwoo beef cattle population.

Flexural Characteristics of Model Composite Deck Fabricated with VARTM (진공성형 제작 모델 복합소재 바닥판의 실험적 휨 거동특성 분석)

  • Lee Sung-Woo
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.18 no.4 s.70
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    • pp.417-426
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    • 2005
  • Recent days composite bridge dock is gaining attraction due to many advantages such as light weight, high strength, corrosion resistance, and high durability. In this study, composite deck models of hat, box and triangular section type wore fabricated with VARTM Process. For these models, three point flexural tests wore carried out both in strong and weak axis. The experimental results were compared with each other to determine efficient section profile. It has been demonstrated that composite sandwich deck has strong potentials to be used as bridge deck in the new construction and rehabilitation works.

Proposal of a New Type of 4-Lane Soundproof Tunnel Girder and Structural Performance Evaluation (4차선급 신형식 방음터널 거더 제안 및 구조적 성능평가)

  • Goh, Won-Hui;Kim, Min-Jae;Ma, Chuan;Kang, Duck-Man;Zi, Goang-Suep
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.25 no.5
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    • pp.24-31
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    • 2021
  • The soundproof tunnels have been generally designed with H-beam girders, and the high weight of H-beam may cause the excessive design of the substructure. To solve this problem, this paper proposes a new soundproof tunnel girder design composed of pipes and discontinuous plates. First, the structural behavior of the straight girder according to the design parameters was examined through finite element analysis. The arrangement and shape of the plates were determined as the design parameter, to obtain the optimal design of girder. After then, the structural behavior and buckling stability of the arched girder were subsequently evaluated. As a result of the parameter analysis, it was confirmed that the axial force acting on the girder increased and the moment decreased as the ratio of unsupported sections decreased or the number of supporting plates increased. The stress concentration on the pipe member was relieved by increasing the long axis length of the elliptical plate. Arched girder analysis showed that the structural efficiency increase as the long axis of elliptical plate increase. As a result of the buckling evaluation, the buckling threshold load of the three connected girders was about 3.7 times higher than the design load. Consequently, it was confirmed that the proposed soundproof tunnel structure design satisfies both light weight and structural safety.

A study on the selection of optimal cross section according to the ventilation system in TBM road tunnels (TBM 도로터널의 환기방식에 따른 최적단면 선정에 관한 연구)

  • Lee, Ho-Keun;Kang, Hyun-Wook;Kim, Hyun-Soo;Kim, Hong-Moon
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.15 no.2
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    • pp.135-148
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    • 2013
  • Recently, road tunnels have become longer and the plans for long and deep road tunnel have been underway in urban areas. These long and deep tunnel excavations include NATM and TBM. Shield TBM is applied to around 80% of traffic tunnels in Europe, and approximately 30% of them in other developed countries. However, as much of equipment is imported from foreign countries at high prices and distribution rate of TBM tunnel is considerably low in Korea, NATM excavation method is commonly used. To increase TBM tunnel, it is necessary to do assure economic feasibility with the supply-demand of TBM equipment. For this, the selection of standardized TBM diameter is urgently needed. Therefore, the study aims to estimate the standardized optimum section properties of TBM by examining TBM excavation cross section utilization depending on the volume of traffic, the number of lane and its cross-section type(single or double deck), and ventilation system.

An Analytical Evaluation on Buckling Resistance of Tapered H-Section Deep Beam (춤이 큰 웨브 변단면 H형 보의 휨내력에 대한 해석적 평가)

  • Lee, Seong Hui;Shim, Hyun Ju;Lee, Eun Taik;Hong, Soon Jo;Choi, Sung Mo
    • Journal of Korean Society of Steel Construction
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    • v.19 no.5
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    • pp.493-501
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    • 2007
  • Recently, in the domestic amount of materials,curtailment and economic efficiency security by purpose, tapered beam application is achieved, but the architectural design technology of today based on the material non-linear method does not consider solutions to problems such as brittle fracture. So, geometric non-linear evaluation thatincludes initial deformation, width-thickness ratio, web stiffener and unbraced length is required. Therefore, in this study, we used ANSYS, a proven finite elementanalysis program,and material and geometric non-linear analysis to study existing and completed tapered H-section as deep beam's analysis model. Main parameters include the width-thickness ratio of web, stiffener, and flange brace, with the experimental result obtained by main variable buckling and limit strength evaluation. We made certain that a large width-thickness ratio of the web decreases the buckling strength and short unbraced web significantly improves ductility.