• 제목/요약/키워드: full-scale test

검색결과 1,165건 처리시간 0.03초

준능동 MR감쇠기가 설치된 실물크기 구조물의 분산제어 알고리즘 성능평가 (Performance Evaluation of Decentralized Control Algorithm of a Full-scale 5-story Structure Installed with Semi-active MR Damper Excited by Seismic Load)

  • 윤경조;박은천;이헌재;문석준;민경원;정형조;이상현
    • 한국소음진동공학회논문집
    • /
    • 제18권2호
    • /
    • pp.255-262
    • /
    • 2008
  • In this study, seismic response control performance of decentralized response-dependent MR damper which generates the control force using only the response of damper-installed floor, was experimentally investigated through the tests of a full-scale structure installed with large MR dampers. The performance of the decentralized control algorithm was compared to those of the centralized ones such as Lyapunov, modulated homogeneous friction, and clipped-optimal control. Hybrid mass damper were controlled to induce seismic response of the full-scale structure under El Centro earthquake. Experimental results indicated that the proposed decentralized MR damper provided superior or equivalent performance to centralized one in spite of using damper-installed floor response for calculating input voltage to MR damper.

고강도 표면매립용철근과 탄소섬유시트로 보강된 비연성 철근콘크리트 골조의 실물 진동기 실험 (Full-Scale Shaker Testing of Non-Ductile RC Frame Structure Retrofitted Using High-Strength Near Surface Mounted Rebars and Carbon FRP Sheets)

  • 신지욱;전종수
    • 한국지진공학회논문집
    • /
    • 제23권1호
    • /
    • pp.43-54
    • /
    • 2019
  • Existing reinforced concrete frame buildings designed for only gravity loads have been seismically vulnerable due to their inadequate column detailing. The seismic vulnerabilities can be mitigated by the application of a column retrofit technique, which combines high-strength near surface mounted bars with a fiber reinforced polymer wrapping system. This study presents the full-scale shaker testing of a non-ductile frame structure retrofitted using the combined retrofit system. The full-scale dynamic testing was performed to measure realistic dynamic responses and to investigate the effectiveness of the retrofit system through the comparison of the measured responses between as-built and retrofitted test frames. Experimental results demonstrated that the retrofit system reduced the dynamic responses without any significant damage on the columns because it improved flexural, shear and lap-splice resisting capacities. In addition, the retrofit system contributed to changing a damage mechanism from a soft-story mechanism (column-sidesway mechanism) to a mixed-damage mechanism, which was commonly found in reinforced concrete buildings with strong-column weak-beam system.

Full-scale simulation of wind-driven rain and a case study to determine the rain mitigation effect of shutters

  • Krishna Sai Vutukuru;James Erwin;Arindam Gan Chowdhury
    • Wind and Structures
    • /
    • 제38권3호
    • /
    • pp.171-191
    • /
    • 2024
  • Wind Driven Rain (WDR) poses a significant threat to the building environment, especially in hurricane prone regions by causing interior and content damage during tropical storms and hurricanes. The damage due to rain intrusion depends on the total amount of water that enters the building; however, owing to the use of inadequate empirical methods, the amount of water intrusion is difficult to estimate accurately. Hence, the need to achieve full-scale testing capable of realistically simulating rain intrusion is widely recognized. This paper presents results of a full-scale experimental simulation at the NHERI Wall of Wind Experimental Facility (WOW EF) aimed at obtaining realistic rain characteristics as experienced by structures during tropical storms and hurricanes. A full-scale simulation of rain in strong winds would allow testing WDR intrusion through typical building components. A study of rain intrusion through a sliding glass door is presented, which accounted for the effects of multiple wind directions, test durations and wind speeds; configurations with and without shuttering systems were also considered. The study showed that significant levels of water intrusion can occur during conditions well below current design levels. The knowledge gained through this work may enhance risk modeling pertaining to loss estimates due to WDR intrusion in buildings, and it may help quantify the potential reduction of losses due to the additional protection from shuttering systems on sliding glass doors during winds.

Peak pressures on low rise buildings: CFD with LES versus full scale and wind tunnel measurements

  • Aly, Aly Mousaad;Gol-Zaroudi, Hamzeh
    • Wind and Structures
    • /
    • 제30권1호
    • /
    • pp.99-117
    • /
    • 2020
  • This paper focuses on the processes of wind flow in atmospheric boundary layer, to produce realistic full scale pressures for design of low-rise buildings. CFD with LES turbulence closure is implemented on a scale 1:1 prototype building. A proximity study was executed computationally in CFD with LES that suggests new recommendations on the computational domain size, in front of a building model, apart from common RANS-based guidelines (e.g., COST and AIJ). Our findings suggest a location of the test building, different from existing guidelines, and the inflow boundary proximity influences pressure correlation and reproduction of peak loads. The CFD LES results are compared to corresponding pressures from open jet, full scale, wind tunnel, and the ASCE 7-10 standard for roof Component & Cladding design. The CFD LES shows its adequacy to produce peak pressures/loads on buildings, in agreement with field pressures, due to its capabilities of reproducing the spectral contents of the inflow at 1:1 scale.

Prediction of nonlinear characteristics of soil-pile system under vertical vibration

  • Biswas, Sanjit;Manna, Bappaditya;Choudhary, Shiva S.
    • Geomechanics and Engineering
    • /
    • 제5권3호
    • /
    • pp.223-240
    • /
    • 2013
  • In the present study an attempt was made to predict the complex nonlinear parameters of the soil-pile system subjected to the vertical vibration of rotating machines. A three dimensional (3D) finite element (FE) model was developed to predict the nonlinear dynamic response of full-scale pile foundation in a layered soil medium using ABAQUS/CAE. The frequency amplitude responses for different eccentric moments obtained from the FE analysis were compared with the vertical vibration test results of the full-scale single pile. It was found that the predicted resonant frequency and amplitude of pile obtained from 3D FE analysis were within a reasonable range of the vertical vibration test results. The variation of the soil-pile separation lengths were determined using FE analysis for different eccentric moments. The Novak's continuum approach was also used to predict the nonlinear behaviour of soil-pile system. The continuum approach was found to be useful for the prediction of the nonlinear frequency-amplitude response of full-scale pile after introducing the proper boundary zone parameters and soil-pile separation lengths.

점탄성 감쇠기가 설치된 실물크기 5층 건물의 진동실험: 감쇠기의 설계 및 응답실험 (Vibration Test of a Full-Scale Five-Story Structure with Viscoelastic Dampers: Damper Design and Test for Response)

  • 민경원;이상현;김진구;이영철;이승준;김두훈
    • 한국지진공학회논문집
    • /
    • 제7권3호
    • /
    • pp.9-15
    • /
    • 2003
  • 본 논문에서는 동반논문에서 연구된 가진방법과 응답특성을 바탕으로, 실물크기의 철골건물에 설치될 점탄성 감쇠기의 설계과정을 다루었으며 가진실험을 수행하여 감쇠기의 진동제어효과를 검증하였다. 최대변위응답을 주어진 수준까지 감소시키기 위하여 요구되는 추가적인 감쇠비를 컨벡스 모델을 이용하여 구하였다. 모드변형에너지법을 이용하여 감쇠기 강성 변화에 따른 모드 감쇠비의 차이를 분석함으로써 감쇠기의 크기를 구하였다. 가새 강성의 효과 또한 모드의 특성을 구하는 과정에 반영하였다. 점탄성 감쇠기는 1층과 2층의 층간에 각각 2개씩 설치되었으며 응답효과를 검증하였다.

선박기관구역 미분무수 소화설비 화재진압 성능 평가 (The Assessment of Fire Suppression Capability of Water-Mist System for Machinery Engine Room)

  • 최병일;한용식;오창보;김명배;김창
    • 한국화재소방학회논문지
    • /
    • 제21권2호
    • /
    • pp.111-117
    • /
    • 2007
  • IMO MSC/circ. 1165 규정에 따라 미분무수를 이용한 선박 기관구역($20m{\times}15m{\times}10m$)에서의 실물화재 소화실험을 수행하였다. K-factor 2.4인 노즐을 사용하였으며 작동압력은 80 bar이다. 미분무수의 화재진압 특성을 수치적으로 예측하기 위하여 FDS를 사용하여 실험과 같은 조건에서의 전산시뮬레이션을 수행하였다. 전산 시뮬레이션 결과 화재 전산 시뮬레이션 기법이 화재소화시간 예측에는 한계를 가지나, IMO MSC/circ. 1165 규정의 공간 내 온도분포 제어 성능의 예측을 위해서 유용하게 활용될 수 있음을 보였다.

Evaluation on bridge dynamic properties and VIV performance based on wind tunnel test and field measurement

  • Yang, Yongxin;Ma, Tingting;Ge, Yaojun
    • Wind and Structures
    • /
    • 제20권6호
    • /
    • pp.719-737
    • /
    • 2015
  • Full scale measurement on the structural dynamic characteristics and Vortex-induced Vibrations (VIV) of a long-span suspension bridge with a central span of 1650 m were conducted. Different Finite Element (FE) modeling principles for the separated twin-box girder were compared and evaluated with the field vibration test results, and the double-spine model was determined to be the best simulation model, but certain modification still needs to be made which will affect the basic modeling parameters and the dynamic response prediction values of corresponding wind tunnel tests. Based on the FE modal analysis results, small-scaled and large-scaled sectional model tests were both carried out to investigate the VIV responses, and probable Reynolds Number effects or scale effect on VIV responses were presented. Based on the observed VIV modes in the field measurement, the VIV results obtained from sectional model tests were converted into those of the three-dimensional (3D) full-scale bridge and subsequently compared with field measurement results. It is indicated that the large-scaled sectional model test can probably provide a reasonable and effective prediction on VIV response.

고속어선의 운동성능 개선장치 개발에 관한 연구 (A Study on the Development of Sea-Keeping Performance Improving Device for High Speed Fishing Vessel)

  • 이귀주;김경화;박나라
    • 수산해양기술연구
    • /
    • 제41권1호
    • /
    • pp.64-69
    • /
    • 2005
  • In spite of many efforts, in the design of high speed fishing vessel the sea-keeping performance improvement without neglection of resistance-propulsion performance by hull form itself has its limitations. In this paper, the development of sea-keeping improving appendage pitching and trim improver for high speed planing hull on behalf of the hull form of fishing vessel has been introduced. The developed appendage verified its effectiveness in the full scale test and also has been proved the better resistance performance in the model test and full scale test.

Full-scale experimental evaluation of a panelized brick veneer wall system under simulated wind loading

  • Liang, Jianhai;Memari, Ali M.
    • Structural Engineering and Mechanics
    • /
    • 제38권1호
    • /
    • pp.99-123
    • /
    • 2011
  • Brick veneer over steel stud backup wall is lighter and easier to construct compared to brick veneer over concrete masonry backup wall. However, due to the relatively low stiffness of the steel stud backup, the brick veneer tends to crack under wind load. This paper briefly introduces a new panelized brick veneer with steel frame backup wall system that is developed to potentially address this problem. The experimental study of the performance of this system under simulated wind loading is discussed in detail. The test setup details and the test specimens are introduced, results of major interests are presented, and performance of the new system is evaluated based on the test results.