Loading-history-based track–bridge interaction analysis with experimental fastener resistance

2015 ◽  
Vol 83 ◽  
pp. 62-73 ◽  
Author(s):  
J. Zhang ◽  
D.J. Wu ◽  
Q. Li
Keyword(s):  
Interaction Analysis ◽  
Loading History ◽  
Track Bridge

scholarly journals Sequential Track–Bridge Interaction Analysis of Quick-Hardening Track on Bridge Considering Interlayer Friction

2020 ◽  
Vol 10 (15) ◽  
pp. 5066
Author(s):  
Sanghyeon Cho ◽  
Kyoung-Chan Lee ◽  
Seung Yup Jang ◽  
Ilwha Lee ◽  
Wonseok Chung
Keyword(s):  
Sequential Analysis ◽  
Interaction Analysis ◽  
Frictional Coefficient ◽  
Additional Stress ◽  
Low Friction ◽  
Running Safety ◽  
Ballast Track ◽  
Longitudinal Resistance ◽  
Longitudinal Slip ◽  
Track Bridge

A quick-hardening track (QHT) was developed by injecting quick-hardening mortar into an existing ballast track to rapidly substitute the ballast track with a slab track, thereby improving maintainability and running safety. QHT tracks on a bridge undergo track–bridge interactions similar to other track systems. This paper presents a model to analyze the interaction between the QHT and the bridge. This model considers the longitudinal resistances of rail fasteners and anchors, as well as the interlayer friction between the track and the bridge. A sequential analysis method was applied to systematically consider such effects, revealing that rail additional stress will be high if the track slips over the bridge for a very low frictional coefficient of 0.1. Furthermore, a track segment without an anchor can slip under train traction load when the frictional coefficient is 0.3 or lower. For low friction cases, low-speed operation is advised to prevent the accumulation of the resulting longitudinal slip displacements of the track. An anchor should be installed immediately after the quick-hardening mortar provides sufficient bearing strength to the anchors. The proposed sequential analysis is useful for determining the critical friction coefficient and appropriate longitudinal resistance of a rail fastener, as well as for verifying track safety.

Rail-Structure Interaction Analysis of Sliding Slab Track on Bridge

2015 ◽  
Author(s):  
Kyoung-Chan Lee ◽  
Seung Yup Jang ◽  
Dong-Ki Jung ◽  
Hyung-Kyoon Byun ◽  
Hyo-Ki Park ◽  
...  
Keyword(s):  
Interaction Analysis ◽  
Span Length ◽  
Bridge Structure ◽  
Structure Interaction ◽  
Slab Track ◽  
Axial Forces ◽  
Continuous Welded Rail ◽  
Rail Structure ◽  
Track Bridge ◽  
Sliding Slab

Continuous welded rail (CWR) on a bridge structure typically experiences a large amount of additional longitudinal axial forces due to longitudinal rail-structure (or track-bridge) interaction under temperature change and train vertical and traction/braking load effect. In order to reduce the additional axial forces, a special type of fastener, such as zero longitudinal restraint (ZLR) and reduced longitudinal restraint (RLR) or rail expansion joint (REJ) should be applied. Sliding slab track system is developed to reduce the effect of rail-structure interaction through the application of a low-frictional sliding layer between slab track and bridge structure. This study presents a track-bridge interaction analysis of the sliding slab track and compares them with conventional fixed slab track on bridges. Various types of span length and longitudinal profiles of bridges are considered in the analysis, which also include multiple continuous spans and extra-dosed bridges. The analysis found that the sliding slab track can reduce the additional axial forces of the continuous welded rail from 80% to 90%, and the difference is more significant for long and continuous span bridge. By the application of the sliding slab track, the use of any other special type of rail fasteners or REJ can be avoided. In addition, span length will not be restricted by the rail-structure interaction effect in planning the railway bridge layout. Continuous span bridge has been usually avoided for railway bridges, but it is preferred for the application of the sliding slab track because the interaction effect can mostly be removed. A continuous span bridge usually has an economical cross-section for the bridge girder, pier and foundation and better dynamic characteristics compared to simple span bridge, and its application eventually will reduce the construction cost of the railway infrastructure.

Modification of the Conventional Method for the Track-Bridge Interaction

2012 ◽  
Vol 204-208 ◽  
pp. 1988-1991 ◽  
Author(s):  
Kyung Min Yun ◽  
Jin Yu Choi ◽  
Chin Ok Lee ◽  
Nam Hyoung Lim
Keyword(s):  
Conventional Method ◽  
Bridge Deck ◽  
Separate Analysis ◽  
Design Codes ◽  
Loading History ◽  
Longitudinal Stress ◽  
Modified Method ◽  
Highly Nonlinear ◽  
Longitudinal Resistance ◽  
Track Bridge

In order to obtain the interaction behavior between the track and the bridge, the various design codes adopted generally the recommendations of the UIC leaflet. The maximum longitudinal stress (force) in the rail can be calculated by the linear combination of the results obtained by the separate analysis of three elementary important loads. This conventional method completely neglects the influence of the loading history, and may have some error because of the behavior of the longitudinal resistance connecting the rail and the bridge-deck is under the highly nonlinear. In this study, the algorithm for the modified method considering the sequential nonlinear loading combination and the effect of the loading history is proposed. The results from the application of the modified method are compared with the results obtained from the conventional method.

A Versatile 3D Vehicle-Track-Bridge Element for Dynamic Analysis of the Railway Bridges under Moving Train Loads

2019 ◽  
Vol 19 (04) ◽  
pp. 1950050 ◽  
Author(s):  
Xiang Xiao ◽  
Wei-Xin Ren
Keyword(s):  
Virtual Work ◽  
Interaction Analysis ◽  
Equations Of Motion ◽  
Time Integration ◽  
Contact Forces ◽  
Dynamic Responses ◽  
Railway Bridges ◽  
Beam Elements ◽  
Track Bridge ◽  
Moving Train

There has been a growing interest to carry out the vehicle–track–bridge (VTB) dynamic interaction analysis using 2D or 3D finite elements based on simplified wheel–rail relationships. The simplified or elastic wheel–rail contact relationships, however, cannot consider the lateral contact forces and geometric shapes of the wheel and rails, and even the occasional jump of wheels from the rails. This does not guarantee a reliable analysis for the safety running of trains over bridges. To consider the wheel–rail constraint and contact forces, this paper proposes a versatile 3D VTB element, consisting of a vehicle, eight rail beam elements, four bridge beam elements, and continuous springs as well as the dampers between the rail and bridge girder. With the 3D VTB element matrices formulated, a procedure for assembling the interaction matrices of the 3D VTB element is presented based on the virtual work principle. The global equations of motion of the VTB interaction system are established accordingly, which can be solved by time integration methods to obtain the dynamic responses of the vehicle, track and bridge, as well as the stability and safety indices of the moving train. Finally, an illustrative example is used to verify the proposed the versatile 3D VTB element for the dynamic interactive analysis of railway bridges under moving train loads.

A Study on Variation of Response according to Longitudinal Track-Bridge Interaction Analysis Methods

2015 ◽  
Author(s):  
Kyungmin Yun ◽  
Beomho Park ◽  
Hyunung Bae ◽  
Shinhyung Choi ◽  
Namhyoung Lim
Keyword(s):  
Interaction Analysis ◽  
Analysis Methods ◽  
Track Bridge

Track-Bridge Interaction Analysis Considering Longitudinal Behavior of Quick Hardening Track on Railway Bridge

2019 ◽  
Vol 22 (12) ◽  
pp. 986-996
Author(s):  
Sang-Hyeon Cho ◽  
Kyoung-Chan Lee ◽  
Won-Seok Chung ◽  
Seung Yup Jang ◽  
Il-Wha Lee
Keyword(s):  
Interaction Analysis ◽  
Railway Bridge ◽  
Track Bridge

Vibration and Bridge-Borne Noise from Urban Rail Transit Trough Beam

2011 ◽  
Vol 255-260 ◽  
pp. 1806-1809
Author(s):  
Jiang Long Han ◽  
Ding Jun Wu ◽  
Qi Li
Keyword(s):  
Interaction Analysis ◽  
Urban Rail Transit ◽  
Dynamic Responses ◽  
Rail Transit ◽  
Superposition Method ◽  
Local Dynamic ◽  
Mode Superposition Method ◽  
Urban Rail ◽  
Transfer Vectors ◽  
Track Bridge

Vehicle-track-bridge dynamic interaction analysis is applied to compute local dynamic responses of a trough beam under urban rail transit train by mode superposition method. The modal acoustic transfer vectors (MATVs) are obtained by boundary element method. The bridge-borne noise at different field points is then computed based on the MATVs and Fourier spectra of the mode coordinate responses of the bridge. The numerical results show that the noise level is significantly affected by the train speed but hardly influenced by the fastening stiffness. The residents in the high-rise buildings near the bridge may be much affected by the bridge-borne noise.

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