• Title, Summary, Keyword: High Speed Railway Bridge

Search Result 219, Processing Time 0.042 seconds

Modeling the cumulative residual deformation of high-speed railway bridge pier subjected to multiple earthquakes

  • Gou, Hongye;Leng, Dan;Yang, Longcheng;Jia, Hongyu
    • Earthquakes and Structures
    • /
    • v.17 no.3
    • /
    • pp.317-327
    • /
    • 2019
  • High-speed railway bridge piers in seismically active area may be subjected to multiple earthquakes and then produce cumulative residual deformation. To study the cumulative residual deformation of high-speed railway bridge piers under multiple earthquakes, a nonlinear numerical analytical model with multi-DOF (MDOF) system is presented and validated against two shaking table tests in this paper. Based on the presented model, a simple supported beam bridge pier model of high-speed railway is established and used to investigate the cumulative residual deformation of high-speed railway bridge pier under mainshock-aftershock sequences and swarm type seismic sequences. The results show that the cumulative residual deformation of the bridge pier increases with earthquake number, and the increasing rates are different under different earthquake number. The residual deformation of bridge pier subjected to multiple earthquakes is accumulated and may exceed the limit of code.

The Design Comparison of High-Speed & Common Railway Bridge with the Example of a Cable Supported Bridge (케이블 지지 교량을 예제로 한 고속철도 및 일반철도의 설계 차이점 분석)

  • Kim, Sung-Il;Byun, Hyung-Gyun
    • Proceedings of the KSR Conference
    • /
    • /
    • pp.649-655
    • /
    • 2009
  • Traffic safety and vibration serviceability of a railway bridge set a limitation to the application of long-span cable supported bridges even though the design trend of the bridge becomes longer and lighter. In the case of high speed railway, it becomes more severe for the high speed of the train and resonance of the structure. Therefore, the cable supported bridge does not exist in Korea high speed railway until now. On the other hand, in recent, Italia, Japan and China do design and construct the long-span cable supported bridges for high speed railway recently with overcoming of traffic safety and passenger comforts. In the present study, prior to analysis of traffic safety and passenger comforts, a extradosed bridge for common railway is re-designed for high speed railway. The difference of member forces and displacements by design live load, the difference of impact coefficient and variable stresses of cables are investigated.

  • PDF

Evaluation of Comfort Limit on High Speed Railway Bridge Vibration Considering Passenger's Comfort (승차감을 고려한 고속철도 교량 진동사용성 평가)

  • Chin, Won-Jong;Kwark, Jong-Won;Choi, Eun-Suk;Kang, Jae-Yoon;Kim, Sung-Tae;Yoon, Hye-Jin;Kim, Nam-Sik
    • Proceedings of the KSR Conference
    • /
    • /
    • pp.829-835
    • /
    • 2011
  • This paper aims for proposed the deflection limit on vibration serviceability of high-speed railway bridges considering passenger's comfort when a train passes a railway bridge. The vertical acceleration signals of passenger cars obtained from test were compared with them from the bridge-train transfer function by riding KTX. The deflections by KTX of seven high speed railway bridges were assumed as sine and haversine wave. The deflection limit on vibration serviceability of high-speed railway bridges considering passenger's comfort when a train passes a railway bridge duration can be expanded using bridge-train transfer function and bridge comfort limit considering serviceability due to bridge vibration. And it was compared to other allowable deflection limits of railway bridge design specifications.

  • PDF

Research on Transition of Road Bed of Wuhan-Guangzhou Passenger Line and Bridge

  • Kang, Bo-Soon;Jun, Yang
    • International Journal of Railway
    • /
    • v.2 no.4
    • /
    • pp.180-186
    • /
    • 2009
  • High speed railway challenge the design, construction and maintaining of traditional railway, many traditional design concepts have been changed. Transition of railway and bridge has two main problems. one is that different lines have different ability of resisting distortion in area of trial load, which was known that problem of smooth transition of stiffness, the other is that differential settlement between artificial structure and earth structure cause bending of railway. The two problems have effect on train moving. The principle of processing transition of railway and bridge is same in world, but it is difficult to find relationship between design standard of transition, vehicle performance, line standard, design speed and so on form documentation and data reports. Based on mechanics, the paper analyzed dynamic performance of transition of high speed railway, studied various rough elements which is effective to train moving, built mathematical model of interaction of train and transition of high speed railway and developed numerical simulation software. In various different work conditions, we did great quantity of numerical simulation, comprehensive analysis and performance analysis.

  • PDF

Deflection Limit on Vibration Serviceability of High-speed Railway Bridges Considering the Exposed Time Duration (진동지속시간을 고려한 고속철도교량의 진동 사용성 처짐 한계)

  • Jeon, Bub-Gyu;Kim, Nam-Sik;Kim, Sung-Il
    • Proceedings of the KSR Conference
    • /
    • /
    • pp.1444-1451
    • /
    • 2010
  • This paper aims for proposed the deflection limit on vibration serviceability of high-speed railway bridges considering the exposed time duration when a train passes a railway bridge. For this purpose, bridge-train transfer function was derived and bridge-train interaction analysis was performed by using the derived function. The vertical acceleration signals of passenger cars obtained from bridge-train interaction analysis were compared with them from the bridge-train transfer function by moving constant force analysis. Therefore it was estimated possible to induce the comfort deflection limit of railway bridge by using bridge-train transfer function. The deflections by moving force of single span bridge and continuous bridge were assumed as sine and haversine wave. The deflection limit on vibration serviceability of high-speed railway bridges considering the exposed time duration can be expanded using bridge-train transfer function and bridge comfort limit considering serviceability due to bridge vibration. And it was compared to other allowable deflection limits of railway bridge design specifications.

  • PDF

The Planning and Design of Jeong-Ji High Speed Railway Bridge (국내최장 고속철도 정지고가(L=9.3km) 교량형식 개발 및 설계 - 35m PSM PSC Box교, 80m 3경간 Arch교, 국내최초 ED교 -)

  • Jang, In-Ho;Park, Kyung-Ho;Park, Jong-Hwa;Kim, Young-Nam;Kim, Sun-Pil
    • Proceedings of the KSR Conference
    • /
    • /
    • pp.1691-1696
    • /
    • 2010
  • Jeong-Ji overbridge is designed to be 9.3km long, the longest for a high speed railway bridge ever constructed in Korea. This bridge is constituted of three types of structure. Standard type bridge is 35m PSC Box bridge which will be constructed by Precast Span Method. To cross the Cheonan Nonsan Expressway, 80m three-span steel arch bridge is designed to avoid rail expansion joint. Finally, Extradosed bridge is planned for high speed railway bridge for the first time in Korea based on originative and advanced design techniques. It is expected that this will contribute to the development of national technology for long-span high speed railway bridges.

  • PDF

RAMS evaluation for a steel-truss arch high-speed railway bridge based on SHM system

  • Zhao, Han-Wei;Ding, You-Liang;Geng, Fang-Fang;Li, Ai-Qun
    • Structural Monitoring and Maintenance
    • /
    • v.5 no.1
    • /
    • pp.79-92
    • /
    • 2018
  • The evaluation theory of reliability, availability, maintainability and safety (RAMS) as a mature theory of state evaluation in the railway engineering, can be well used to the evaluation, management, and maintenance of complicated structure like the long-span bridge structures on the high-speed railway. Taking a typical steel-truss arch bridge on the Beijing-Shanghai high-speed railway, the Nanjing Dashengguan Yangtze River Bridge, this paper developed a new method of state evaluation for the existing steel-truss arch high-speed railway bridge. The evaluation framework of serving state for the bridge structure is presented based on the RAMS theory. According to the failure-risk, safety/availability, maintenance of bridge members, the state evaluation method of each monitoring item is presented. The weights of the performance items and the monitoring items in all evaluation levels are obtained using the analytic hierarchy process. Finally, the comprehensive serving state of bridge structure is hierarchical evaluated.

Mapping vertical bridge deformations to track geometry for high-speed railway

  • Gou, Hongye;Ran, Zhiwen;Yang, Longcheng;Bao, Yi;Pu, Qianhui
    • Steel and Composite Structures
    • /
    • v.32 no.4
    • /
    • pp.467-478
    • /
    • 2019
  • Running safety and ride comfort of high speed railway largely depend on the track geometry that is dependent on the bridge deformation. This study presents a theoretical study on mapping the bridge vertical deformations to the change of track geometry. Analytical formulae are derived through the theoretical analysis to quantify the track geometry change, and validated against the finite element analysis and experimental data. Based on the theoretical formulae, parametric studies are conducted to evaluate the effects of key parameters on the track geometry of a high speed railway. The results show that the derived formulae provide reasonable prediction of the track geometry change under various bridge vertical deformations. The rail deflection increases with the magnitude of bridge pier settlement and vertical girder fault. Increasing the stiffness of the fasteners or mortar layer tends to cause a steep rail deformation curve, which is undesired for the running safety and ride comfort of high-speed railway.

A Study on the Solution of Excessive Accelerations on the Bridge for Gyeongbu High-speed Railway (경부고속철도 교량의 과도한 가속도의 저감방안에 대한 연구)

  • Kwark, Jong-Won;Chin, Won-Jong;Choi, Eun-Suk;Cho, Jeong-Rae;Lee, Jung-Woo
    • Proceedings of the KSR Conference
    • /
    • /
    • pp.477-485
    • /
    • 2007
  • When Korean High Speed Train (KTX) runs over a high-speed railway bridge, the high-speed railway bridge gives quite large acceleration response. Local vibration at the large cross section, the impact from equally spaced sleepers, the vibration due to elastomeric bearings, and the vibration from the train itself are the causes of this acceleration response. Maximum peaks of the accelerations measured at the bridges are sometimes going over the limit value. Although it is smaller than 0.35G, the limit from the Korean Bridge Design Manual(BRDM), this acceleration response should be reduced for the safety of running trains with high speed. In this paper, to reduce the acceleration response by controlling excessive local vibration at the large cross section, vibration reduction method is studied. The result shows that the effect of elastomeric bearings on the vibration of the bridge is very large and that the vibration reduction device is effective against wing mode local vibration PSC box girder bridge for the high-speed railway, which usually has very large cross section, although it has little effect on global vibration modes such as flexural and twisting modes. The test of the vibration reduction device on the bridge in service has been performed in this study.

  • PDF

Precast Full Span Construction of Continuous PSC Box Girder Bridge for High Speed Railway (고속철도 PSC 박스거더 연속고의 프리캐스트 경간 일괄 가설)

  • Park Jeong Wha;Kim Kwang Soo;Sim Chungwook;Yoon Chul-Soo
    • Proceedings of the KSR Conference
    • /
    • /
    • pp.1168-1173
    • /
    • 2004
  • Bridges and tunnels mainly compose the structural system of Kyung-bu high-speed railway in Korea and the prestressed concrete box girder bridges are applied for the most part of bridge structures. Precast full span construction method was practiced in the construction of many prestressed concrete box girder bridges in Kyung-bu high speed railway for the high quality, great construction speed, low construction cost and construction safety. However, there have been no application of this method in continuous bridges until now. Therefore, a new advanced precast full span construction method is developed using pre-tensioning for precast and post-tensioning in alternating the simple span into a continuous bridge system. since the high-speed railway trains can cause dynamic problems in a continuous bridge. This study shows the structural behavior and the construction process of the new advance method.

  • PDF