• Title, Summary, Keyword: full-scale testing

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Development of devices and methods for simulation of hurricane winds in a full-scale testing facility

  • Huang, Peng;Chowdhury, Arindam Gan;Bitsuamlak, Girma;Liu, Roy
    • Wind and Structures
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    • v.12 no.2
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    • pp.151-177
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    • 2009
  • The International Hurricane Research Center (IHRC) at Florida International University (FIU) is pursuing research to better understand hurricane-induced effects on residential buildings and other structures through full-scale aerodynamic and destructive testing. The full-scale 6-fan Wall of Wind (WoW) testing apparatus, measuring 4.9 m tall by 7.3 m wide, is capable of generating hurricane-force winds. To achieve windstorm simulation capabilities it is necessary to reproduce mean and turbulence characteristics of hurricane wind flows. Without devices and methods developed to achieve target wind flows, the full-scale WoW simulations were found to be unsatisfactory. To develop such devices and methods efficiently, a small-scale (1:8) model of the WoW was built, for which simulation devices were easier and faster to install and change, and running costs were greatly reduced. The application of such devices, and the use of quasiperiodic fluctuating waveforms to run the WoW fan engines, were found to greatly influence and improve the turbulence characteristics of the 1:8 scale WoW flow. Reasonable reproductions of wind flows with specified characteristics were then achieved by applying to the full-scale WoW the devices and methods found to be effective for the 1:8 scale WoW model.

Assessment of Structural Behavior of Transmission Line Tower using Strain Gauging Method

  • Shukla, Veerendra Kumar;Selvaraj, M.
    • International journal of steel structures
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    • v.17 no.4
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    • pp.1531-1538
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    • 2017
  • Design of latticed steel transmission towers is a challenging task which involves lengthy modeling and detailing of significant amount of steel members and connections. After that full scale testing of towers validates the modeling and detailing and ensures that the towers are designed to withstand design loads without premature failures. In present work, a 132 kilovolt double circuit suspension tower has been considered for study. The tower was designed using Staad.pro software and the member forces were calculated at design loads. After design, the full scale testing of the tower was carried out. During testing, the strains in some of the critical members were measured using strain gauges. Using these strain values, the actual load in selected members are calculated. The paper provides the comparison between actual load in members during full scale testing and computed loads from software. The paper also discusses the possible reasons behind the difference between actual and computed loads. Loads on the tower at different points for different conditions are presented. The paper also provides a discussion about the possible reasons of premature failure of tower during full scale testing or at site and the remedial measures are presented to avoid the failure.

Development of a Piping Integrity Evaluation Simulator Based on the Hardware-in-the-Loop Simulation (하드웨어-인-더-루프 기반의 배관 평가 시뮬레이터의 개발)

  • Kim, Yeong-Jin;Heo, Nam-Su;Cha, Heon-Ju;Choe, Jae-Bung;Pyo, Chang-Ryul
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.7
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    • pp.1031-1038
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    • 2001
  • In order to verify the analytical methods predicting failure behavior of cracked piping, full-scale pipe tests are crucial in nuclear power plant piping. For this reason, series of international test programs have been conducted. However, full-scale pipe tests require expensive testing equipment and long period of testing time. The objective of this paper is to develop a test system which can economically simulate the full-scale pipe test regarding the integrity evaluation. This system provides the failure behavior of cracked pipe by testing a wide-plate specimen. The system provides the failure behavior of cracked pipe by testing a wide-plate specimen. The system was developed for the integrity evaluation of nuclear piping based on the methodology of hardware-in-the-loop (HiL) simulation. Using this simulator, the piping integrity can be evaluated based on the elastic-plastic behavior of full-scale pipe, and the high cost full-scale pipe test may be replaced with this economical system.

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

  • Shin, Jiuk;Jeon, Jong-Su;Wright, Timothy R.
    • Journal of the Earthquake Engineering Society of Korea
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    • v.23 no.1
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    • pp.43-54
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    • 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.

Identification of flutter derivatives from full-scale ambient vibration measurements of the Clifton Suspension Bridge

  • Nikitas, Nikolaos;Macdonald, John H.G.;Jakobsen, Jasna B.
    • Wind and Structures
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    • v.14 no.3
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    • pp.221-238
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    • 2011
  • The estimated response of large-scale engineering structures to severe wind loads is prone to modelling uncertainties that can only ultimately be assessed by full-scale testing. To this end ambient vibration data from full-scale monitoring of the historic Clifton Suspension Bridge has been analysed using a combination of a frequency domain system identification method and a more elaborate stochastic identification technique. There is evidence of incipient coupling action between the first vertical and torsional modes in strong winds, providing unique full-scale data and making this an interesting case study. Flutter derivative estimation, which has rarely previously been attempted on full-scale data, was performed to provide deeper insight into the bridge aerodynamic behaviour, identifying trends towards flutter at higher wind speeds. It is shown that, as for other early suspension bridges with bluff cross-sections, single-degree-of-freedom flutter could potentially occur at wind speeds somewhat below requirements for modern designs. The analysis also demonstrates the viability of system identification techniques for extracting valuable results from full-scale data.

A Running Stability Test of 1/5 Scaled Bogie using Small Scale Derailment Simulator (소형탈선시뮬레이터 상에서의 1/5 축소대차의 안정성 해석)

  • Eom, Beom-Gyu;Lee, Se-Yong;Lee, Young-Yeob;Kang, Bu-Byoung;Lee, Hi-Sung
    • Proceedings of the KSR Conference
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    • pp.1905-1913
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    • 2011
  • The dynamic characteristic of bogie that is driving system of railway vehicle is very important regarding decision of vehicle characteristics as running safety and comport. The dynamic characteristic test of bogie is tested on full size in place on field testing on track. But, the testing on the full size caused many problems. To overcome these problem by full size test, the Railway Safety Research Center in Seoul National University of Science & Technology developed 1/5 scale size of small scale derailment simulator and is currently testing running stability of 1/5 scaled bogie. Also To take effectively advantage of running stability test using small scale derailment simulator in actuality design and reliability estimation, it is necessary comparison and examination with field test and theoretical analysis result In this paper. to achieve running stability analysis of 1/5 scaled bogie on small scale derailment. the program using MATLAB that is fast compose and analysis the motion equation of Saemaul power bogie is developed. It is achieved analysis according to various specification (weight, size, suspension, etc..) and is evaluated corelation between test result and dynamic characteristic of actual railway vehicle.

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Development of the Scale Track to Test Bogie Steering Performance (대차 조향 특성 시험을 위한 축소 트랙 개발)

  • Hur, Hyun-Moo;Park, Jun-Hyuk;You, Won-Hee;Park, Tae-Won
    • Proceedings of the KSR Conference
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    • pp.301-305
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    • 2007
  • The performance of the railway bogie is classified into the stability and the steering performance. Testing for the bogie stability is conducted on the roller rig. But testing for the bogie steering performance on test facility is very difficult, so the testing for the vehicle curving performance is conducted on the real curve track. And it is desirable to test on the full scale test rig, but it caused many problems relating to test costs, test time. To overcome these problems, the small scale test rig is actively used in the field of bogie stability. Thus, in this paper, we have studied the scale track to test the bogie steering performance. For this, we designed the 1/5 scale test track equivalent to radius 200 curve and confirmed the validity of the testing for the bogie steering performance on the scale curve track through the testing using 1/5 scale bogie.

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Wind loading on trees integrated with a building envelope

  • Aly, Aly Mousaad;Fossati, Fabio;Muggiasca, Sara;Argentini, Tommaso;Bitsuamlak, Girma;Franchi, Alberto;Longarini, Nicola;Crespi, Pietro;Chowdhury, Arindam Gan
    • Wind and Structures
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    • v.17 no.1
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    • pp.69-85
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    • 2013
  • With the sustainability movement, vegetated building envelopes are gaining more popularity. This requires special wind effect investigations, both from sustainability and resiliency perspectives. The current paper focuses on wind load estimation on small- and full-scale trees used as part of green roofs and balconies. Small-scale wind load assessment was carried out using a wind tunnel testing in a global-effect study to understand the interference effects from surrounding structures. Full-scale trees were investigated at a large open-jet facility in a local-effect study to account for the wind-tree interaction. The effect of Reynolds number combined with shape change on the overall loads measured at the base of the trees (near the roots) has been investigated by testing at different model-scales and wind speeds. In addition, high-speed tests were conducted to examine the security of the trees in soil and to assess the effectiveness of a proposed structural mitigation system. Results of the current research show that at relatively high wind speeds the load coefficients tend to be reduced, limiting the wind loads on trees. No resonance or vortex shedding was visually observed.

Development of a robust bench-scale testing unit for low-pressure membranes used in water treatment

  • Huang, Haiou;Schwab, Kellogg;Jacangelo, Joseph G.
    • Membrane Water Treatment
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    • v.2 no.2
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    • pp.121-136
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    • 2011
  • A bench-scale test has recently been proposed as a predictive tool to minimize the scope of pilot-scale testing or to optimize the operation of full-scale membrane filtration systems. Consequently, a bench-scale testing unit was developed for this purpose and systematically evaluated in this study. This unit was capable of accommodating commercially available, low pressure, hollow fiber (LPHF) membranes with various configurations for testing under conditions comparable to real-world applications. Reproducibility of this unit in assessing membrane fouling and microbial removal efficiency of LPHF membranes was tested and statistically comparable results were obtained. This unit serves as a useful apparatus for academic researchers and utilities to evaluate the performance of LPHF membranes used for water treatment.

The Effects of Embankment Condition of Subgrade on Compaction. (노상 성토조건에 의한 다짐영향)

  • 노한성;김태수;최영철;백종은
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.357-364
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    • 2002
  • This paper describes the feasibility of compacting subgrade layer in thicker lifts than currently permitted as 20 cm. This project involved constructing and testing a full scale test section in highway. Soil stiffness in field was evaluated by a nondestructive testing method, called Geogage. Quality control tests and FE Analysis were also conducted. Typical dynamic compaction roller of 11ton weight is applied for full scale test and a Mohr-Coulomb model and Plane strain condition are used for FE Analysis. The results showed that compaction-induced stress and dissipated energy are mainly depend on depth of soil and it could be possible to increase thickness of a lift.

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