• Title, Summary, Keyword: 에너지 소산

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Evaluation of Seismic Performance for an Internally Confined Hollow CFT Column (내부 구속 중공 CFT 기둥의 내진 성능 평가)

  • Han, Taek Hee;Kim, Sung Nam;Kang, Young Jong
    • Journal of Korean Society of Steel Construction
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    • v.19 no.1
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    • pp.53-65
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    • 2007
  • Column tests were performed for a new type of column, the internally confined hollow concrete filled tube column (ICH CFT column), to evaluate its seismic performance. The seismic performances for two types of ICH CFT columns and a general solid RC column were evaluated and compared by quasi-static tests. The displacements and the lateral loads of column specimens were measured during tests. Ductilities, absorbed energy, equivalent damping ratios, damage indices were calculated from recorded data. From the test results, the ICH CFT column shows superior seismic performances with double moment capacity and larger energy absorbing capacity over that of a solid RC column.

Seismic Performance of a Hollow Composite Column (강합성 중공 기둥의 내진 성능)

  • Han, Taek Hee;Kim, Jung Hun;Lim, Nam Hyoung;Kang, Young Jong
    • Journal of Korean Society of Steel Construction
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    • v.20 no.2
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    • pp.215-226
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    • 2008
  • A column test was performed for a hollow composite column to evaluate its seismic performance. The seismic performances of a hollow composite column and a reinforced concrete (RC) column were evaluated and compared by quasi-static tests. Lateral displacements and lateral loads of the column specimens were measured during tests. Ductilities, absorbed energy, equivalent damping ratios, and damage indices were calculated from the recorded data. From the test results, the hollow composite column showed a seismic performance superior to the column in terms of double moment capacity, ultimate energy, and energy absorption.

Behavior of Steel Beam Connections under Cyclic Loading (반복하중을 받는 철골보 접합부의 거동)

  • 이승준;김상배
    • Journal of the Earthquake Engineering Society of Korea
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    • v.3 no.4
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    • pp.23-32
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    • 1999
  • Behavior of H-beam connections under cyclic loadings is investigated experimentally in this study. The purpose of this study is to study the effect of steel properties and coping shape on the hysteretic behavior of H-beam connections. Five beam-to-column connection specimens were fabricated and tested under cyclic loadings. The load-rotation curves of the beam connections were mainly obtained. Deformation capacity and energy dissipation capacity of the connections are compared each other. The connections fabricated from SS400 showed good deformability and energy dissipation capacity, but those from SM490 showed brittle fracture at the connection. The coping shape at the connections showed a little difference in cyclic behavior.

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Capacity Development of Existing Frame by Aramid Sheet and Energy Dissipation Device (아라미드 시트와 에너지 소산 장치에 의한 기존 골조의 능력 향상)

  • Lee, Hyun-Ho
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.19 no.5
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    • pp.112-119
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    • 2015
  • In this paper, the strengthening method was proposed for improving the seismic performance of the vulnerable structural frames. To improve the brittle characteristics of columns, aramid fiber sheet was used for the lateral confinement of columns. And to introduce the energy dissipation capacity, a steel damper with S-shaped struts was installed. By making the unreinforced and reinforced specimens with full size specimens were evaluated for lateral load resistance capacity. It was confirmed the strengthening effects by the evaluation of failure shape, strength, stiffness degradation, and energy dissipation capacity. Also from the FE analysis using ABAQUS, the hysteretic behavior of the specimens were predicted and evaluated.

Behavior characteristics of Pile-type vessel collision protective structure (파일형 선박충돌방호공의 거동특성)

  • Lee, Jeong-Woo;Park, Jun-Seok;Lee, Gye-Hee
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.433-436
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    • 2010
  • 본 논문에서는 파일형 선박충돌 방호공에 선박이 충돌하였을 때 방호공의 거동을 해석하였다. 방호공의 구조는 상부슬래브, RCP 말뚝 및 이를 지지하는 지반은 비선형 지반스프링으로 모델링 하였다. 상부슬래브 8절점요소로 모델링 하였으며 철근과 콘크리트로 구성되어있다. RCP 말뚝은 철근망과 충진콘크리트로 구성되어있으며 충돌 시 파괴거동을 표현할 수 있는 Damaged Plasticity로 모델을 사용하였고 Shell 요소로 모델링 하였다. 선박충돌 시 선박의 강성에 따른 거동 특성을 파악하기 위해 선박을 강체모델과 실제모델에 대한 해석을 수행하였다. 선박과 교량의 충돌은 정면충돌로 고려하였으며, 충돌속도는 3.3m/sec로 가정하였다. 선박과 방호공과의 충돌 해석은 비선형 해석 프로그램인 ABAQUS/Explicit을 이용하여 수행하였으며, 이를 통하여 선박 충돌 시 방호공의 에너지 거동을 분석하였다. 해석결과 선박의 강성이 커질수록 슬래브의 변형 및 소산 에너지량이 커지는 것을 확인할 수 있었다.

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The Limiting Drift and Energy Dissipation Ratio for Shear Walls Based on Structural Testing (전단벽의 최소 층변위 및 에너지 소산성능)

  • ;;N.M.Hawins
    • Magazine of the Korea Concrete Institute
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    • v.10 no.6
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    • pp.335-343
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    • 1998
  • Recently, new experimental criteria for reinforced concrete frame structures in high seismic regions have been reported in United States. The objective of the criteria is to get more reliable test data which are valid to compare with other test data done by different researchers. The criteria precribe test method of specimens, analysis method of test data, and limiting values needed to specimens like drift angle, energey dissipation ratio, stiffness, and strength. These criteria might be usefel to get objective conclusion. Shear wall structures, which belong to one of earthquake resisting systems, also need this kind of criteria. But, the general response of shear wall structures is a little bit different from that of frame structures since shear wall restrains the horizontal displacement caused by horizontal force and increases the stiffness and strength. The objective of this paper is to propose a criterion for limiting drift and energy dissipation ratio of shear walls based on structural testing. These are the most important values for presenting the capacity of shear walls. Limiting drift and energy dissipation ratios were examined for tests on shear walls having ductile type failures. Test data were analyzed and compared to the results for a suggested acceptance criteria that involve a limiting drift that is a function of aspect ratio and a limiting energy dissipation ratio that is a function of displacement ductility and damping.

Mineralogical Phase Transform of Salt-roasted Concentrate and Enhancement of Gold Leaching by Chlorine-hypochlorite Solution (소금-소성정광에 대한 광물학적 상변화와 염소-차아염소산 용액을 이용한 금 용출 향상)

  • Kim, Bong-Ju;Cho, Kang-Hee;Oh, Su-Ji;Choi, Seoung-Hwan;Choi, Nag-Choul;Park, Cheon-Young
    • Journal of the Mineralogical Society of Korea
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    • v.26 no.1
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    • pp.9-18
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    • 2013
  • In order to optimize the gold leaching process from refractory sulfide concentrate, a chlorine-hypochlorite solution with varying concentrations and temperatures were applied to salt-roasted concentrate. The concentrate consisted of pyrite, chalcopyrite, and galena, which were turned into hematite through air-roasting at $750^{\circ}C$. Also these concentrates were changed into hematite and nantokite (CuCl)) through salt (NaCl)-roasting at $750^{\circ}C$. The results of the gold leaching experiments showed that the best gold leaching parameters were obtained when the hydrochloric acid-sodium hypochlorite mix was at a ratio of 1 : 2, the added concentration was 1.0 M concentration, the pulp density was 1.0%, and the leaching was done at a $60^{\circ}C$ leaching temperature. The leaching rate for gold was much greater in the roasted concentrate than in the raw concentrate. The leaching rate was greater in the salt-roasted concentrate than in the plain roasted concentrate too. From XRD analysis, quartz was found in the salt-roasted concentrate and in the solid residue from the chlorine-hypochlorite leaching solution at $60^{\circ}C$.

Energy Dissipation Demand of Braces Using Non-linear Dynamic Analyses of X-Braced Frame (비선형 동적 해석을 통한 X형 가새골조 내 가새 부재의 에너지 소산)

  • Lee, Kangmin
    • Journal of Korean Society of Steel Construction
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    • v.15 no.4
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    • pp.379-388
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    • 2003
  • The response of single story buildings and other case studies were investigated to observe trends and develop a better understanding of the impact of some design parameters on the seismic response of Concentrically Braced Frames (CBF). While many parameters are known to influence the behavior of braced frames, the focus of this study was mostly on quantifying energy dissipation in compression and its effectiveness on seismic performance. Based on dynamic analyses of single story braced frame and case studies, a bracing member designed with bigger R and larger KL/r was found to result in lower normalized cumulative energy ratio in both cases.

Investigation on Damping of Steel Fiber Reinforced Concrete (강섬유철근콘크리트보의 에너지감쇠에 관한 연구)

  • 강보순
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.159-169
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    • 2000
  • 본논문에서는 강섬유 철근 콘크리트 보(SFRC) 의 감쇄 거동에 대해서 실험적인 방법과 수치 해석적인 방법으로 연구를 수행하였다 SFRC는 보다 향상된 에너지 소산능력으로 일반 철근 콘크리트보에 비하여 뛰어난 감쇄 거동을 보인다. 감쇄거동은 종방향 철근비강섬유의 형태와 부피 콘크리트 강도 응력 수준등에 의해 영향을 받는다 SFRC보의 감쇠는 다양한 수준의 균열상태에서의 동적실험 데이터를 통하여 평가하였다 곡률과 감쇠의 관계식에 기초한 유한요소 프로그램(TICAL) 이 개발되었으며 0.44%의 강섬유를 혼입한 보의 경우 5-35%의 감쇠비 증가를 보였다

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Experimental Study on Functional Improvement of Porous Floating Breakwaters (유공부유식방파제의 방파성능에 관한 실험적 연구)

  • Yoon, Jae-Seon;Han, Sae-Jong;Cho, Yong-Sik
    • Proceedings of the Korea Water Resources Association Conference
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    • pp.44-48
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    • 2011
  • 본 연구에서는 구조물 상치에 에어챔버를 설치하여 챔버 내부의 공기주입량에 따라 흘수심을 조절 할 수 있는 유공 및 투수성부유식방파제를 사용하였으며, 부유식방파제의 흘수심구간에 유공을 두어 내부의 흐름에 따른 에너지소산 효과를 수리모형실험을 통하여 분석하였다. 기존 연구에 의하여 선행되어진 부유식방파제의 형상은 구조물 제체의 입사면과 투과면이 막힌 형태의 연구가 대다수였으나, 계류라인의 장력에 따른 부체의 안정성을 고려하여 본 수리모형실험에서는 입사면 흘수심구간과 투과면 흘수심구간에 유공 및 투수층을 두어 진행하는 입사파랑을 일부 흡수하도록 하였다. 또한, 부유식방파제 흘수심단면의 내부에서 흐름변화에 의한 에너지소산 효과와 입사면과 투과면의 유공률 변화에 따른 방파성능을 무공 부유식방파제와 비교하며 효율성을 분석하였다.

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