• Title/Summary/Keyword: and deflection

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Application of the ANFIS model in deflection prediction of concrete deep beam

  • Mohammadhassani, Mohammad;Nezamabadi-Pour, Hossein;Jumaat, MohdZamin;Jameel, Mohammed;Hakim, S.J.S.;Zargar, Majid
    • Structural Engineering and Mechanics
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    • v.45 no.3
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    • pp.323-336
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    • 2013
  • With the ongoing development in the computer science areas of artificial intelligence and computational intelligence, researchers are able to apply them successfully in the construction industry. Given the complexities indeep beam behaviour and the difficulties in accurate evaluation of its deflection, the current study has employed the Adaptive Network-based Fuzzy Inference System (ANFIS) as one of the modelling tools to predict deflection for high strength self compacting concrete (HSSCC) deep beams. In this study, about 3668measured data on eight HSSCC deep beams are considered. Effective input data and the corresponding deflection as output data were recorded at all loading stages up to failure load for all tested deep beams. The results of ANFIS modelling and the classical linear regression were compared and concluded that the ANFIS results are highly accurate, precise and satisfactory.

Anticipated and actual performance of composite girder with pre-stressed concrete beam and RCC top flange

  • Gurunaathan, K.;Johnson, S. Christian;Thirugnanam, G.S.
    • Structural Engineering and Mechanics
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    • v.61 no.1
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    • pp.117-124
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    • 2017
  • Load testing is one of the important tests to determine if the structural elements can be used at the intended locations for which they have been designed. It is nothing but gradually applying the loads and measuring the deflections and other parameters. It is usually carried out to determine the behaviour of the system under service/ultimate loads. It helps to identify the maximum load that the structural element can withstand without much deflection/deformation. It will also help find out which part of the element causes failure first. The load-deflection behaviour of the road bridge girder has been studied by carrying out the load test after simulating the field conditions to the extent possible. The actual vertical displacement of the beam at mid span due to the imposed load was compared with the theoretical deflection of the beam. Further, the recovery of deflection at mid span was also observed on removal of the test load. Finally, the beam was checked for any cracks to assert if the beam was capable of carrying the intended live loads and that it could be used with confidence.

Development of the controller for peeling off the enamel and forming of deflection yoke coil (편향요크코일의 에나멜 탈피 및 통전성형을 위한 탈피통전기의 개발)

  • Jeong, Soo-Hoa;Yun, Jong-Soon;Kwon, Woo-Hyun
    • Proceedings of the KIEE Conference
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    • 1995.07a
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    • pp.202-205
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    • 1995
  • Developed controller is the part of deflection yoke winding machine which controls the power to form the deflection yoke coil into desired shape after winding. So as to form the deflection yoke coil, it is needed to melt the bonding material which is spreaded on the coil. The heat melt the bonding material which is produced by flowing the current through the winded coil. Therefore, at first it is needed to peel off the enamel from the winded coil so as to flow the current, and then supply the power to produce the heat which form the winded coil into desired shape. Naturally developed controller is composed of the peeling part and the conduction and forming part. All of them consist of the inverter structure and control the output current. The peeling is achieved by low voltage and high AC current, the conduction and forming is by DC current. Developed controller also has a function that detect the resistance of the deflection yoke coil to prevent the damage of the load which is produced by poor peeling.

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Drift error compensation for vision-based bridge deflection monitoring

  • Tian, Long;Zhang, Xiaohong;Pan, Bing
    • Smart Structures and Systems
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    • v.24 no.5
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    • pp.649-657
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    • 2019
  • Recently, an advanced video deflectometer based on the principle of off-axis digital image correlation was presented and advocated for remote and real-time deflection monitoring of large engineering structures. In engineering practice, measurement accuracy is one of the most important technical indicators of the video deflectometer. However, it has been observed in many outdoor experiments that data drift often presents in the measured deflection-time curves, which is caused by the instability of imaging system and the unavoidable influences of ambient interferences (e.g., ambient light changes, ambient temperature variations as well as ambient vibrations) in non-laboratory conditions. The non-ideal unstable imaging conditions seriously deteriorate the measurement accuracy of the video deflectometer. In this work, to perform high-accuracy deflection monitoring, potential sources for the drift error are analyzed, and a drift error model is established by considering these error sources. Based on this model, a simple, easy-to-implement yet effective reference point compensation method is proposed for real-time removal of the drift error in measured deflections. The practicality and effectiveness of the proposed method are demonstrated by in-situ deflection monitoring of railway and highway bridges.

Back calculation and solution Technique of E-modulus by FWD′s deflection data in Pavement (FWD 처짐치에 의한 포장층 탄성계수 역산 및 해석기법)

  • 위성동
    • Proceedings of the Korean Geotechical Society Conference
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    • 2002.10a
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    • pp.188-200
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    • 2002
  • In this study, a pavement evaluation method is introduced by a case study of the measurement data obtained in Incheon International Airport. Based on the results obtained by both visual inspection and automobile inspection equipments, the pavement surface condition is evaluated and used for maintenance and rehabilitation strategy for pavement. In addition, the special attention was given to the back calculation and solution technique of E-modulus by FWD's deflection data in Pavement.

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Comparison of steels via SMAW and MIG welding methods under industrial loads

  • Soy, Ugur
    • Steel and Composite Structures
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    • v.11 no.3
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    • pp.225-232
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    • 2011
  • In this study, the deflection and deformation behaviours of IPN80 steel beam and column were investigated under the different industrial loads. Single-sided welds were applied to IPN80 steel beams using shielded metal arc (SMAW) and metal inert gas welding (MIG) method in the form of T-type. After that, the performance of SMAW and MIG welded joints were identified using beam bending test under 500 and 3000 N loads. SMAW and MIG methods were compared with each other to understand the deflection and deformation behaviours of the welded steel structures. Lower deformation and deflection were obtained in MIG welded steel beams. The results show that, steel beams welded MIG method has higher load capacity than SMAW welded ones. MIG welding method is more reliable than the SMAW method for the combining performance and load capacity.

A Relation between Anchor Unbonded Length, Anchor Loads, and Wall Deflection in Tieback Anchored Wall (타이백 억지토류벽에서 앵커 자유장 및 앵커하중의 크기와 벽체변위와의 상관성)

  • 임유진
    • Journal of the Korean Geotechnical Society
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    • v.15 no.6
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    • pp.187-200
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    • 1999
  • An extensive investigation is performed to analyze the behavior of tieback anchored wall. Finite element method is used and several case histories are collected to investigate the relationship of wall deflection, anchor unbonded length, and anchor load. The finite element method can calculate wall deflection with changing the anchor unbonded length and the anchor load. Wall deflection normalized by excavation height can be related to anchor location so that it may produce a zone chart. It is found that a different chart showing the relation of the wall deflection, the anchor load, and anchor unbonded length can be constructed. It is necessary to collect more case histories considering soil conditions and to perform FE analysis extensively with changing bonded length to extend the capability of this relation chart into practice.

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Relationship between the CMOD and the Load-Line Deflection of Concrete (콘크리트의 균열개구 변위와 하중방향 변위관계)

  • 김석기
    • Magazine of the Korea Concrete Institute
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    • v.9 no.1
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    • pp.183-194
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    • 1997
  • Traditional displacmir~nt measurement included an extrancous and cvrntlc. portmn due to test setup and support crushing. The magnitudc of this erroneous deformation was found to be of the same order as the actual displacement, leading to inaccurate determinations of fracture parameters. To overcome this problem, the load-CMOD relationship is a more reliable parameter for determining the fracture characteristics because it is unaffected by the specimen setup and any support crushing. An important step towards the use of load-(:MOD concept as a key fracture parameter depends on relating the CMODto the traditional load-line deflection. This investigation found that there was an unique linear relationship between the CMOD and the load-line deflection. The exact numeric value of relationship between the CMOD and the deflection. that is, the slope ofthe line, is discovered to be a material property. The relationship finds a problem with the existing IZIL,EM recommendations for. measuring the fracture energy of concrete. A proposal to correct the problem is made.

Characteristics of Surface Morphology According to the Pulse Change When Wire-cut Electrical discharge Machining (와이어컷 방전가공시 펄스변화에 따른 표면형상 특성)

  • 이재명
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.04a
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    • pp.537-542
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    • 2000
  • Wire deflection, surface roughness and roundness were observed on changing discharge time for electrical discharge machining(EDM) of STD-11 in various conditions of thickness. The wire deflection was decreased as increasing discharge time and wire tension. The deflection is the smallest at the speed of wire of 10.6m/min and the water specific resistivity of 5k$\Omega$.cm. The deflection is found to be decreased as increasing dwell time. But if the water pressure is high, it is found not to be changed after the vibration of 4sec. The component of copper(Cu) and zinc(Zn), which is the main material of wire electrode, is observed for rough wire-cutting EDM of STD-11. This phenomena is found to be similar in spite of the change of EDM energy level. But it will be improved by changing the material and the shape of wire. The roundness of middle is found to be worse than that of upper and it is increased as the thickness of material is increased.

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Prediction of Ring Deflection GRP Pipe Buried Underground (지중매설 GRP 관의 관변형 예측)

  • Kim, Sun-Hee;Lee, Young-Geun;Joo, Hyung-Jung;Jung, Nam-Jin;Yoon, Soon-Jong
    • Journal of the Korean Society for Advanced Composite Structures
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    • v.4 no.3
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    • pp.38-44
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    • 2013
  • Glass fiber reinforced plastic (GRP) pipes buried underground are attractive for use in harsh environments, such as for the collection and transmission of liquids which are abrasive and/or corrosive. In this paper, we present the result of investigation pertaining to the structural behavior of GRP flexible pipes buried underground. In the investigation of structural behavior such as a ring deflection, experimental and analytical studies are conducted. In addition, vertical ring deflection is measured by the field test and finite element analysis (FEA) is also conducted to simulate behavior of GRP pipe buried underground. Based on the results from the finite element analyses considering soil-pipe interaction the vertical ring deflection behavior of buried GRP pipe is predicted. In addition, analytical and experimental results are compared and discussed.