Elasto-Plastic Earthquake Response Analysis of High-Speed Railway Bridge Fabricated Isolation Bearings

2011 ◽  
Vol 675-677 ◽  
pp. 1175-1178
Author(s):  
Ling Kun Chen ◽  
Li Zhong Jiang ◽  
Peng Liu
Keyword(s):  
High Speed ◽  
Plastic Hinge ◽  
Response Analysis ◽  
Railway Bridge ◽  
High Speed Railway ◽  
Finite Element Program ◽  
Railway Bridges ◽  
Earthquake Resistant ◽  
Element Program ◽  
Rubber Bearings

Basin rubber bearings are frequently used in high-speed railway bridge or passenger special line railway bridge, lead rubber bearings (LRB) are infrequently used in those railway bridges nowdays, the study on earthquake-resistant capability of railway bridge fabricated isolation bearing - the intelligent and functional structure - would be beneficial in engineering practices. Elasto-plastic earthquake responses of high-speed railway bridges fabricated LRB are studied by means of the finite element program, earthquake responses of railway bridges under high-speed vehicles and different earthquake action fabricated and unfabricated isolation bearing are calculated respectively. The results show that: plastic hinge will develop at the bottom of piers in regard to railway bridges with mid-high and low pier; LRB can reduce displacement and inner forces of structures and improve earthquake-resistant capability of structures effectively.

Research on Railway Bridge Evaluation Index

2013 ◽  
Vol 838-841 ◽  
pp. 1126-1129
Author(s):  
Zhao Lan Wei ◽  
Guo Jun Liu ◽  
Zu Yin Zou
Keyword(s):  
High Speed ◽  
Evaluation Index ◽  
Railway Bridge ◽  
High Speed Railway ◽  
Railway Bridges ◽  
Bridge Evaluation ◽  
Normal Speed ◽  
The Difference

Each related index was compared in three specifications, including Fundamental code for design on railway bridge and culvert, Code for rating existing railway bridges, and Code for design of high speed railway. The reasons of the difference existed in indexes was revealed, especially between high speed railway bridge and normal speed railway bridge.

The Finite Element Analysis of Dynamic Interaction of High-Speed Shinkansen, the Rail, and Bridge

1993 ◽  
Author(s):  
Makoto Tanabe ◽  
Hajime Wakui ◽  
Nobuyuki Matsumoto
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
High Speed ◽  
Response Analysis ◽  
Element Formulation ◽  
Element Analysis ◽  
Finite Element Program ◽  
The Finite Element Analysis ◽  
Element Program ◽  
The Impact

Abstract A finite element formulation to solve the dynamic behavior of high-speed Shinkansen cars, rail, and bridge is given. A mechanical model to express the interaction between wheel and rail is described, in which the impact of the rail on the flange of wheel is also considered. The bridge is modeled by using various finite elements such as shell, beam, solid, spring, and mass. The equations of motions of bridge and Shinkansen cars are solved under the constitutive and constraint equations to express the interaction between rail and wheel. Numerical method based on a modal transformation to get the dynamic response effectively is discussed. A finite element program for the dynamic response analysis of Shinkansen cars, rail, and bridge at the high-speed running has been developed. Numerical examples are also demonstrated.

Effects of CRTS II Unballasted Track on Seismic Response of High-Speed Railway Bridge

2014 ◽  
Vol 584-586 ◽  
pp. 2099-2104 ◽  
Author(s):  
Yong Liang Zhang ◽  
Pei Shan Wang ◽  
Ji Dong Zhao
Keyword(s):  
Seismic Response ◽  
High Speed ◽  
Response Analysis ◽  
Railway Bridge ◽  
High Speed Railway ◽  
Bridge Model ◽  
Longitudinal Stiffness ◽  
Girder Bridge ◽  
Transitional Section ◽  
Earthquake Response Analysis

Based on properties of high-speed railway bridge and rail system restraints, the rail-bridge model is established by considering CRTS II unballasted track and bridge structure. The results show that the effect of CRTS II system restraints on seismic response for multi-span simply supported girder bridge is greater so the rail-bridge model should be adopted in earthquake response analysis. Due to the effect of longitudinal stiffness of the railway and bridge transitional section such as terminal spine, the more significant is unloading for seismic response of the side piers if the fewer is the number for the rear-structure spans.

Effect of Shield Tunneling on High-Speed Railway Bridges under the Influence of Train Operations

2013 ◽  
Vol 831 ◽  
pp. 423-429
Author(s):  
Xiao Jing Wang ◽  
Kai Xu
Keyword(s):  
High Speed ◽  
Internal Force ◽  
Shield Tunnel ◽  
Railway Bridge ◽  
The Finite Element Method ◽  
Shield Tunneling ◽  
Tunnel Excavation ◽  
High Speed Railway ◽  
Railway Bridges ◽  
The Impact

This paper is based on one project of Metro shield tunnel across a high-speed railway bridge. In the study the impact of train operations is taken into account, the finite-element method is adopted to analyze effect of shield tunneling. The conclusions indicate that according to the different tunnels and relative positions of pile, the excavation of the tunnels would have different effects on pile foundation. When the construction of shield across the bridge, the nature of the soil and will have an effect on deformation and stress of pile. Due to tunnel excavation of bridge internal force on bridge attached to the forces of good roles and bad role. Additional deformation of the beams and the additional forces are very small, so they will not affect the bridge work.

Study on the Effects of Train Live Loads on Isolated and Non-Isolated Simply Supported Railway Bridges

2011 ◽  
Vol 50-51 ◽  
pp. 100-104
Author(s):  
Chang Yong Zhang ◽  
Tie Yi Zhong ◽  
Ke Jian Chen ◽  
Yun Kang Gong
Keyword(s):  
Time History ◽  
Railway Bridge ◽  
Finite Element Program ◽  
Railway Bridges ◽  
Simply Supported ◽  
Rubber Bearing ◽  
Lead Rubber Bearing ◽  
Element Program ◽  
Live Loads ◽  
High Level

In this paper, based on the finite element program ANSYS, the model of a simply supported railway bridge with and without isolation using lead rubber bearing is established. Seismic response time-history analyses of the bridge subjected to high-level earthquakes are carried out considering and not considering train live loads. Through the comparison and analyses of the results, the effects of train live loads on seismic calculation of non-isolated railway bridges and isolated railway bridges are obtained. The results of the research will support the further study on seismic design and isolation design of simply supported railway bridges.

Dynamic Properties of Lead Rubber Bearings and its Seismic Isolation Applications in High-Speed Railway Bridge

2010 ◽  
Vol 150-151 ◽  
pp. 164-167 ◽  
Author(s):  
Ling Kun Chen ◽  
Li Zhong Jiang ◽  
Peng Liu
Keyword(s):  
High Speed ◽  
Seismic Isolation ◽  
Dynamic Properties ◽  
Computational Method ◽  
Dynamic Responses ◽  
Railway Bridge ◽  
Widespread Application ◽  
High Speed Railway ◽  
Rubber Bearing ◽  
Rubber Bearings

Lead rubber bearing (LRB) is a new type of earthquake-resistance rubber bearings, formed by inserting lead-core into ordinary laminated rubber bearing, vertical supporting, horizontal displacement and hysteretic damping are hung in single unit together. For lead-core can dissipate seismic energy and increase stiffness under load simultaneously, and most of the requirements of the Seismic isolation system can be satisfied, the material-device has been found widespread application prospect in bridge engineering. Hysteretic behaviors, ductility, and energy dissipation of LRB are mainly determined by some dynamical parameters such as characteristic intensity of LRB, post-yield, pre-yield stiffness and so on. Equivalent linear model of hysteretic characteristics, computational method and the varying range of dynamic parameters of LRB are presented. Dynamic responses of high-speed railway bridge fabricated LRB are calculated, and calculation results are compared with those fabricated common bearings, factors which influence seismic isolation are analyzed.

Seismic Response Analysis of High-Speed Railway Bridge Fabricated Round-Ended Piers

2011 ◽  
Vol 243-249 ◽  
pp. 3844-3847 ◽  
Author(s):  
Ling Kun Chen ◽  
Li Zhong Jiang ◽  
Zhi Ping Zeng ◽  
Bo Fu Luo
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Strong Motion ◽  
Element Model ◽  
Theory Of Elasticity ◽  
Response Analysis ◽  
Seismic Load ◽  
Railway Bridge ◽  
Earthquake Intensity ◽  
High Speed Railway

The responses of high-speed railway bridge subjected to seismic load were investigated by numerical simulation, the whole finite element model of the multi-span bridge simply supported bridge was set up, and natural vibration properties of structure were analyzed. According to theory of elasticity and elastic-plasticity, parametric study was conducted to assess the influences of different speeds, strong motion record, pier height and earthquake acceleration on the seismic capability of high-speed bridge subjected to different strength of the earthquake, the finite element soft ware and moment-curvature program were employed to calculate the earthquake responses of bridge. The calculation results show that, with the increase of train speed, pier height and earthquake intensity, the earthquake responses of bridge are increase in general, and the bottom of piers step into states of elastic-plasticity under high-level earthquake, elastic-plastic deformation is larger, the stirrup encryption measures should be carried out.

Seismic damage features of high-speed railway simply supported bridge–track system under near-fault earthquake

2020 ◽  
Vol 23 (8) ◽  
pp. 1573-1586 ◽  
Author(s):  
Wei Guo ◽  
Xia Gao ◽  
Ping Hu ◽  
Yao Hu ◽  
Zhipeng Zhai ◽  
...  
Keyword(s):  
High Frequency ◽  
High Speed ◽  
Seismic Damage ◽  
Railway Bridge ◽  
High Speed Railway ◽  
Railway Bridges ◽  
Simply Supported ◽  
Near Fault ◽  
Track System ◽  
Pulse Type

Seismic loads pose a potential threat to the high-speed railway bridges in China, which have been rapidly developing in recent years, especially for those subjected to the near-fault earthquakes. The previous researches on high-speed railway bridges usually concern the far-field earthquake, and the damage of high-speed railway bridge–track system subjected to the near-fault earthquake has not been well studied. In this article, a seven-span high-speed railway simply supported bridge–track system is selected to explore the seismic damage features under the excitation of near-fault earthquake which possesses characteristics of obvious velocity pulse and high-frequency vibration. First, a detailed finite element model of the selected bridge–track system is established and calibrated by the experimental data and design code. Then the low-frequency pulse-type portion and the high-frequency background portion are separated from the selected eight original near-fault records, and a series of nonlinear dynamic analysis is conducted. The results show that the background portion leads to more serious damage of the bridge–track system than the pulse-type portion. Due to the high stiffness of high-speed railway bridge–track system, the background portion with high-frequency vibration characteristic produces the main part of seismic response of system. As for the damage part of system, the weakest component of the bridge–track system is the sliding layer, followed by the shear alveolar.

Dynamic Performance Analysis of a High-Speed Railway Bridge Under Train Actions Using Operational Modal Parameters

2021 ◽  
pp. 2140007
Author(s):  
Xiao-Mei Yang ◽  
Chun-Xu Qu ◽  
Ting-Hua Yi ◽  
Hong-Nan Li ◽  
Hua Liu
Keyword(s):  
Modal Analysis ◽  
High Speed ◽  
Dynamic Performance ◽  
Modal Parameters ◽  
Variational Mode Decomposition ◽  
Railway Bridge ◽  
High Speed Railway ◽  
Railway Bridges ◽  
Mode Decomposition ◽  
Coupling Dynamic

For high-speed railway bridges in operation, it is necessary to reveal the coupling dynamic performance of train–bridge systems in order to avoid extreme vibrations, which are not conducive to bridge safety. With the opening of long-span heavy-haul and complex-type bridges to traffic, the train–bridge interaction can hardly be explained by a mature and unified theory. Notably, field testing and monitoring analysis have become popular in tracking the dynamic performance of train–bridge systems. The vibration of railway bridges depends on the train-track configuration and the inherent characteristics of bridges. The inherent characteristics of bridges, which are reflected by the modal parameters, are extracted via operational modal analysis in this paper. In addition, the modal characteristics of bridges while the train is passing through are also investigated to explain the coupling dynamic effect with the help of the train configuration. Considering that the measured vibration responses are seriously polluted by non-white noise or excitation, the variational mode decomposition (VMD) technique is developed to extract the state-driven vibrations for modal analysis. Since VMD is a univariate technique that hardly ensures that the weak component can be obtained from each measuring channel, the multi-channel variational mode decomposition (MVDM) technique is extended in this paper. The field monitoring data of a high-speed railway bridge are taken for modal identification and vibration analysis. The results show that the weak structural modes can be tracked, even though the forced vibrations due to the passage of regularly spaced axles are dominant. In addition, the dynamic effects in train-induced vertical vibrations of bridges are closely related to the train speed, heavy axle loads and the span length.

Railway bridge dynamics: development of a new high-speed train load model for dynamic analyses of train crossing

2021 ◽  
Author(s):  
Michael Reiterer ◽  
Andrei Firus ◽  
Alois Vorwagner ◽  
Geert Lombaert ◽  
Jens Schneider ◽  
...  
Keyword(s):  
Dynamic Load ◽  
High Speed ◽  
Railway Bridge ◽  
High Speed Train ◽  
Research Project ◽  
High Speed Railway ◽  
Railway Bridges ◽  
Load Model ◽  
Dynamic Analyses ◽  
Institute Of Technology

<p>In 2019, the German Federal Railway Authority commissioned the consortium TU Darmstadt, KU Leuven, AIT-Austrian Institute of Technology and REVOTEC to develop a new dynamic load model for high-speed railway bridges. It aims to cover the envelopes of the dynamic train signatures and acceleration responses for all currently operating trains and the current HSLM (high-speed load model), given in the Eurocode. In addition, the development of the new load model should also include possible configurations of fast freight trains and future train configurations. An overview of the planned content of the research project and selected results of the current work will be presented.</p>

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