• Title, Summary, Keyword: 동적 열차하중

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Dynamic Analysis for Railway Bridge Considering Urban Maglev Train (도시형 자기부상열차 하중을 고려한 철도교량 동적해석)

  • Kim, Jung-Hun;Cha, Kyung-Ryul;Lee, Ung-Hee;Kang, Young-Jong
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.481-484
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    • 2011
  • 최근 철도는 미래의 핵심교통수단이자 저탄소 녹색성장을 대표하는 교통수단으로 주목받고 있다. 그 중 자기부상열차는 바퀴 마찰에 따른 소음 진동 분진이 없는 차세대 교통수단이며, 이를 지지하는 구조물(교량)은 열차의 운행 안정성(동적거동)을 고려한 설계가 필요하다. 또한, 상부 구조물은 자기부상열차의 연행이동등분포하중을 지지하며, 이러한 하중조건을 갖는 차량이 운행할 때 상부 구조물은 설계기준사항들을 만족해야한다. 도시형 자기부상철도 토목구조물 설계기준에 의하면 도시형 자기부상철도의 운행 안정성(동적거동)을 평가하기 위한 항목들로 대상 구조물의 고유진동수, 승차감을 고려한 연직처짐 등이 요구된다. 따라서, 본 연구에서는 자기부상열차의 실 열차하중을 고려하여 연행이동등분포하중으로 철도교량의 동적거동을 검토하였으며, 설계기준을 적용하여 대상 철도 교량의 운행 안정성을 평가하였다.

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Dynamic Analysis for a Arch Railway Bridge Considering Real Train Loads (실 열차하중을 고려한 아치 교량의 동적해석)

  • Kim, Jung-Hun;Lee, Joo-Tak;Lee, Myeong-Sup;Kang, Young-Jong
    • 한국방재학회:학술대회논문집
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    • pp.77.2-77.2
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    • 2010
  • 고속열차(KTX)를 지지하는 구조물은 차량과 지속적인 접촉을 갖는 구조를 가지고 있으므로 고속열차의 운행 안정성(동적거동)을 고려한 설계가 필요하다. 또한, 상부 구조물은 고속열차의 연행이동집중하중을 지지하며, 이러한 하중조건을 갖는 차량이 운행할 때 상부 구조물은 설계 기준사항들을 만족해야한다. 호남고속철도 설계지침에 의하면 고속열차(KTX)의 운행 안정성을 평가하기 위한 항목들로 대상 교량의 고유진동수, 상판 수직가속도, 면틀림 그리고 승차감을 고려한 연직처침 등이 요구된다. 따라서, 본 연구에서는 KTX의 실 열차하중을 고려하여 연행이동집중하중으로 아치 교량의 동적거동을 검토하였으며, 호남고속철도 설계지침을 적용하여 대상 교량의 운행 안정성을 평가하였다.

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Study on Dynamic Characteristics of Structure Approaches by Train Moving Loads (열차이동하중 작용시 구조물 접속부의 동적 거동특성 연구)

  • Eum, Ki Young;Kim, Young Ha;Kim, Jae Wang
    • Journal of the Korean Society for Railway
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    • v.16 no.4
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    • pp.298-304
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    • 2013
  • This paper systematically analyzes the dynamic effects of structure approaches which are expected to have direct effects on train loads - according to the train's acceleration as the area under consideration is located in a section where acceleration of high speed railway vehicles and the train's operating speed happens. In addition, through an examination of the dynamic train loads, dynamic behavioral characteristics of embedded structures and structure approaches were analyzed and a numerical analysis has been carried out in order to evaluate the performance of track subgrade and the safety of the structure. As a result, we reach the conclusion that the dynamic effects by train loads is low, but somewhat high vertical acceleration occurs.

Behavior Characteristics of Railway Roadbed Retained by Geosynthetic Reinforced Segmental Wall Under Train Load (열차 하중 작용 시 블록식 보강토 옹벽으로 지지된 철도 노반의 거동)

  • Lee, Seong Hyeok;Choi, Chan Yong;Lee, Jin Wook
    • Journal of the Korean Society for Railway
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    • v.15 no.5
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    • pp.467-475
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    • 2012
  • Static and dynamic train load tests were conducted to evaluate the train load transfer mechanism in the roadbed which was retained by two types (fully and partially) of segmental retaining walls reinforced by geogrid. The test roadbed was 2.6m high, 5m wide, and 6m long. A combination of earth pressure gages, displacement transducers, and strain gages were placed in specific locations to measure the responses. Test results showed that the wall displacement pattern as well as the earth pressure for the fully reinforced retaining wall was different from those for the partially reinforced retaining wall. In the dynamic train load test, the strain in the upper part of the wall tended to decrease, and both the residual deformation and the rate of the deformation were significantly lower than those in the current design standard.

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.

Longitudinal Dynamic Behavior of KASR-Bridge Installed Creep-Couplers (Creep-Coupler가 설치된 KHSR 교량으 종방향 동적거동)

  • 곽종원
    • Journal of the Earthquake Engineering Society of Korea
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    • v.4 no.4
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    • pp.111-116
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    • 2000
  • 경간사이에 creep-coupler가 설치된 경부 고속철도 교량에 TGV-K 열차의 제동에 의한 교량의 종방향 동적거동을 해석하였다. 교량은 40m 길이의 2경간 연속교이며, 종방향 충격 하중을 인접 경간 혹은 교대로 전달하기 위한 목적으로 인접하고 있는 두 교량 사이의 creep-coupler가 설치되었다. 철도교의 경우에는 레일에 대한 종방향 축력검토가 매우 중요하므로, 이를 지지하고 있는 교량의 하부구조(교각과 기초)의영 향을 고려한 교량의 동적거동해석이 요구된다. 본 연구에서는 TGV-K의 실제 제동하중에 의한 KHSR(Korea high speed railway)에 건설중인 실제교량의 동해석을 하부구조와 동특성치를 고려하여 수행하였다. TGV-K는 객차사이에 대차가 위치하므로 전체 열차의 모델링이 한꺼번에 이루어 져야한다. 동핵석을 위해서 열차의 3차원 수치모델링이 이루어졌다. TGV-K의 제동은 동력차의 전기적인 제동에 의한 회생제동력(regenerative braking force)과 객착의 기계적인 판제동(disk braking)으로 이루어진다. 이러한 제동작용의 고려에 실제 TGV-K의 제동함수가 사용되었다.

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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.

Effects of Vehicle Loads on Thermal Buckling Behavior of Continuous Welded Rail Tracks (장대레일 궤도의 온도좌굴 거동에 미치는 열차하중의 영향)

  • Choi, Dong Ho;Kim, Ho Bae
    • Journal of Korean Society of Steel Construction
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    • v.12 no.6
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    • pp.727-736
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    • 2000
  • The present study investigates the influences of vehicle induced loads on the thermal buckling behavior of straight and curved continuous welded rail (CWR) tracks. Quasi-static loads model is assumed to determine the uplift region, which occurs due to the vertical track deflection induced by wheel loads of vehicle. The lateral loads of vehicle induced by weight, the speed, the superelevation and curvature of track, and other dynamic vehicle track interaction, are included in the ratio of lateral to vertical vehicle load. Parametric numerical analyses are perfomed to calculate the upper and lower critical buckling temperatures of CWR tracks, and the comparison between the results of this work and the previous results without vehicle is also included.

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A Study on Dynamic Response of Truss Bridge due to Moving Train Loads (열차하중의 주행에 의한 트러스교의 동적응답에 관한 연구)

  • Chang, Dong Il;Choi, Kang Hee;Lee, Jong Deuk
    • Journal of The Korean Society of Civil Engineers
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    • v.9 no.2
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    • pp.1-10
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    • 1989
  • In this paper, dynamic response of a truss bridge due to constantly moving train loads is analysed. Dynamic response of the bridge is found by the mode superposition method with the solution of the eigenvalue problem by Householder transformation and QL algorithm. To prove the validity of the analysis procedure, the response due to a very slowly moving load is compared with the result from the static analysis program, and the dynamic response is also compared with the result from the direct integration method. Based upon this, the variation of dynamic amplification factors is investigated by changing the train types and speeds, and the result is compared with the code specified impact factor. From this study, it was known that the dynamic amplification factor is not quite different by train types in low speeds but in high speeds it is, and in the case of electric car and U. I. C. loads the factor could exceed the code specified impact factor depending upon the speed.

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Dynamic Behavior of the Prestressed Composite Girder by Modal Tests and Moving Train Analysis (프리스트레스트 강합성 거더의 모달테스트 및 이동 열차하중 해석에 의한 동적거동)

  • Kim, Sung Il;Lee, Pil Goo;Lee, Jung Whee;Yeo, In Ho
    • Journal of Korean Society of Steel Construction
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    • v.18 no.6
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    • pp.793-804
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    • 2006
  • Various PSC and steel-concrete composite railway bridges are being developed for short-medium spans with structural and economic efficiency. According to the design concept, the prestressed composite girder bridge has the advantages of being lightweight and having low girder depth, with the capacity for long spans. However, the dynamic behavior under a passing train is one of the critical issues concerning these railway bridges designed with more flexibility. Therefore, it is very important to evaluate the modal parameters before performing dynamic analyses. In this paper, real-scale prestressed composite girders were fabricated as a test model and modal testing was carried out to evaluate modal parameters including natural frequency and modal damping ratio. During the modal testing, a digitally controlled vibration exciter as well as an impact hammer was applied to obtain frequency-response functions, and the modal parameters were also evaluated after the fracture of test models. With application of reliable properties from modal tests, the estimation of dynamic performances of prestressed composite girder railway bridges can be obtained from various parametric studies on dynamic behavior under the passage of a moving train.