• Title, Summary, Keyword: 이동하중해석

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Application of the Absorbing Boundary Condition in Moving Force Analysis of Asphalt Concrete Track (흡수경계조건의 아스팔트 콘크리트 궤도 동적 해석에의 적용)

  • Lee, Seonghyeok;Chung, Keunyoung;Jung, Wooyoung
    • Journal of the Korean Society for Railway
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    • v.19 no.1
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    • pp.54-66
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    • 2016
  • In this study, the absorbing boundary condition was adopted to prevent elastic wave propagation due to abrupt load condition changes in moving force analysis. It was proven to be effective in reducing inappropriate noise components. Furthermore, to verify whether fixed point excitation in a laboratory test can simulate train movement effectively, the results of dynamic analysis for fixed point excitation and moving force conditions were analyzed. The dynamic stability of an asphalt track structure under a KTX train condition was also studied. Additionally, the dynamic safety of asphalt tracks was verified by comparing the results of a moving force analysis under a KTX train load and a quasi-static analysis under the design standard Korean train load.

Efficient Analysis of Structure Vibration Induced by Walking Loads (보행하중에 의한 구조물 진동의 효율적인 해석)

  • 김기철;이동근
    • Journal of the Earthquake Engineering Society of Korea
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    • v.5 no.1
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    • pp.21-29
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    • 2001
  • 주차장, 버스터미널, 스타디움, 집회공간과 같은 낮은 고유진동수를 갖는 장경간 건축물에서는 저속 차량의 이동하중이나 보행자의 보행하중과 같은 동적하중에 의해 과도한 바닥판 진동이 발생할 수 있으며 이러한 진동은 건축물의 이용자에게 불쾌감을 일으켜 건축물의 사용성에 심각한 영향을 주게된다. 구조물에 가해지는 보행하중의 일반적인 적용방법은 분할된 요소의 절점을 따라 절점하중으로 가하는 것이다. 그러나 이러한 해석모델은 보행하중을 절점에만 가해야하는 제한적인 문제점을 가지고 있어 보폭 수만큼 절점을 생성시켜야 하며 보폭이 변하거나 절점이외에 하중이 작용할 경우 해석모델을 수정해야하는 번거로움이 있다. 본 연구에서는 보행하중에 대한 계측과 분석을 통하여 보행하중의 동적특성을 분석하였으며 계측한 보행하중을 예제구조물에 적용하였다. 그리고 보행하중에 의한 구조물 진동의 효율적인 해석을 위하여 구조물에 가해지는 보행하중을 등가의 절점하중으로 치환하는 방법을 제안하였으며 제안된 등가절점 하중의 타당성을 검증하기 위하여 예제구조물의 진동해석을 수행하였다.

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Dynamic Response Analysis of Stiffened Plates Subjected to Moving Loads (이동하중을 받는 보강판의 동응답해석)

  • 정정훈;정태영
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.124-129
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    • 1992
  • 이동 집중력 및 집중질량에 의한 이동하중을 받는 직사각형 보강판에 대하 여 보강재효과집중 모델링방법에 의거하여 보강판을 등방성 박판 및 보강재 효과를 반영한 등가보요소로 이루어진 판-보 조합체로 유한요소 모델링하고 Newmark의 직접 시간적분법을 이용한 동응답 해석방법을 정식화하였다. 일 련의 수치계산 예를 통하여 본 연구에서 제시한 방법이 이동하중을 받는 보 강판의 동응답 해석문제에 효과적으로 적용될 수 있음을 확인하였다. 아울러 parametric study를 통하여 이동하중이 작용하는 보강판의 동응답특성은 이 동하중의 질량효과를 고려하는 경우와 고려하지 않는 경우 매우 달라지며, 이동하중에 의한 동적응답은 이동속도가 증가할수록 정하중에 의한 응답보 다 증폭되어 나타나고 증폭비율이 질량효과를 고려할 경우 훨씬 더 커짐을 확인하였다.

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Vibration Analysis of Space Structure with Retractable Roof (개폐식 지붕구조의 움직임에 대한 공간구조물의 진동해석)

  • Kim, Gee-Cheol;Kang, Joo-Won;Kim, Hyun-Su
    • Journal of the Korean Association for Spatial Structures
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    • v.11 no.1
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    • pp.113-120
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    • 2011
  • Retractable roof system is one of the special feature in stadium or complex structure. And this retractable roof system makes possible to use spacial structure all-weather. This retractable roof system is able to classified into overlapping, parallel movement and folding system. Moving load, impact load, inertial or braking loads, these dynamic loads induced by movements of retractable roof system. So it is necessary to analysis of spacial structures are subjected to these dynamic loads. Dynamic loads that are induced by the retractable roof movements can be applied to moving mass method or moving force method. But, moving force method is appropriate because the retractable roof movements is slow relatively. In this paper, new application method of moving forces induced by the retractable roof movements is proposed. And vibration analysis of spacial structures are executed by using the proposed method. This proposed equivalent moving force can be easily applied to spacial structure that is subjected to dynamic loads induced by movement of the retractable roof system.

Application of Response Spectrum Method for Analysis of a Floor System Subjected to Dynamic Loads on Multiple Locations (복수 절점에 가진되는 건물 바닥판의 해석을 위한 응답스펙트럼 해석법의 응용)

  • 김태호;이동근
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.15 no.1
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    • pp.21-32
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    • 2002
  • In general, the response spectrum analysis method (R.S.A) is widely used for seismic analysis of building structure. But, it is not common to apply R.S.A for the analysis of structural vibration caused by dynamic loads of equipments, machines and moving leads, etc. The time history analysis method(T.H.A) for the vibration analysis, compared with R.S.A, is very complex, difficult and time consuming. So the application of R.S.A, that is convenient to calculate maximum responses for structural vibration, is proposed in this study. At first, the procedure for the application of the R.S.A to calculate of the maximum vibration response induced by dynamic load applied on the single point is described. And then, the process, which can save the time and the memory for calculation of the maximum vibration response induced by dynamic loads on the multi-point is proposed, and the maximum structural response caused by moving loads are obtained. Lastly, the accuracy of the proposed method is verified by comparing the results of R.S.A to T.H.A for some example models.

Analysis of the Linear Transformation of Prestressing Tendon Using Equivalent toad Method (등가하중법 관점에서 분석한 프리스트레싱 텐던의 직선이동)

  • 오병환;전세진
    • Journal of the Korea Concrete Institute
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    • v.14 no.6
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    • pp.843-850
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    • 2002
  • Linear transformation theory has been effectively used in the design and analysis of prestressed concrete structures. The underlying assumptions of the theory, which were often overlooked, are investigated in the respect of equivalent load method. As a result, it is found that the same equivalent loading system is produced for all the cases of the linear transformation by the assumptions of the conventional equivalent load method. On the other hand, equivalent loading systems in a strict and accurate sense do not satisfy the classical theories of the linear transformation. Also, it is shown that a little different equivalent loading system from the conventional one is obtained for each linear transformation according to the proposed equivalent load method that is derived from the self-equilibrium property of the tendon-induced forces. Therefore, it can be concluded that the linear transformation theory is valid only when referring to the conventional approximate equivalent load method. The discussions are further extended to the eccentrically located circumferential tendon in the wall of containment structures, where the problem of eccentricity is analyzed also from the view point of the linear transformation.

Three Dimensional Model for Dynamic Moving Load Analysis of a PSC-I Girder Railway Bridge (PSC-I 거더 철도교량의 3차원 동적 이동하중 해석 모델)

  • Cho, Jeong-Rae;Kim, Dong-Seok;Kim, Young Jin;Kwark, Jong-Won;Jang, Seung Yup
    • Journal of the Korean Society for Railway
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    • v.16 no.4
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    • pp.286-297
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    • 2013
  • In this paper we evaluated dynamic stability, considering the effects of modeling and analysis methods on moving load analysis, for which a sophisticated 3 dimensional model of a PSC-I type girder bridge was used. For this purpose, we suggested a reasonable modeling method and the physical properties of the concrete and ballasted track system involved. We also analyzed the response characteristics according to: 1) the type of track system; 2) whether or not the track was modeled; 3) whether or not the distance between the girder center and the bearing were considered; 4) the analysis method (i.e., direct integral and modal analysis); 5) whether or not the frequency was filtered.

Evaluation of Dynamic Stability for Structural Bar Reinforced Precast and Prestressed Retaining Wall for Moving Train Load (이동열차하중에 대한 강봉으로 보강된 프리캐스트 프리스트레스트 옹벽의 동적 안정성 평가)

  • Lee, Il Wha;Um, Ju Hwan;Lee, Kang Myung;Keum, Chang Jun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.15 no.5
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    • pp.190-198
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    • 2011
  • The precast production has many advantages by fast construction period, labor-saving and high quality. In recent years, the application of the precast product has been increased in the earth retaining wall field. This paper presents the results of the numerical analysis that was carried out to evaluate the dynamic stability of precast and prestressed earth retaining wall under moving train load. The two-dimensional FEM analysis was used to the numerical analyses. The train load to act on trackbed is combined by the real measured roughness phase angle and quasi-static load. The dynamic stability is analysed by the displacement, acceleration and stress under moving train load at each specified location. The results of the analysis show that the precast and prestressed retaining wall has very stable capability for the railway.

Moving Load Analysis of Bridge Structures Using Experimental Modal Data (실험적 모우드 계수를 이용한 교량의 주행하중 해석)

  • 이형진
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.15 no.3
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    • pp.409-420
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    • 2002
  • This paper proposed a technique of structural re-analysis for the evaluation of dynamic responses of bridge structure under moving loads using experimental modal results. For successful structural re-analysis, it is required to have accurate estimation techniques of the modal characteristics of bridge structures. The natural frequencies and mode shapes were identified by direct fourier analysis techniques and damping ratios by the random decrement method, respectively. An interpolation method was also proposed for the extension of mode shape measured on limited DOFs. Second, the structural reanalysis was performed using moving mass model and identified modal parameters. The results from the reanalysis show that the proposed technique is very reasonable to evaluate the actual behavior of bridge structures under moving loads.

회전 핀에 의한 이동 하중에 따른 보의 대변형 수치 해석

  • 정일섭
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.65-65
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    • 2004
  • 스프링은 변위에 상응하는 에너지를 저장하는 기계 요소로서 다양한 분야에 적용되고 있으며, 나선형(helical) 스프링, 와선형(spiral) 스프링, 비틀림 막대, 디스크(disk) 스프링, 판(plate) 스프링, 일정 하중(constant force) 스프링 둥 다양한 종류가 있다. 근래 많이 사용되는 LCD 모니터 가운데 일부는 경사(tilt), 회전(pivot), 방향 전환(swivel) 등 모니터의 각도 변화가 가능하도록 제작되며, 이러한 각도 변화시 사용자가 적절한 반력을 느끼도록 인간 공학적으로 설계되어 있다.(중략)

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