scholarly journals Multiaxial Fatigue Assessment for the Hanger Deck Connection of a High-Speed Steel-Truss-Arch Railway Bridge

2021 ◽  
Vol 11 (3) ◽  
pp. 1142
Author(s):  
Yongsheng Song ◽  
Youliang Ding ◽  
Fei Jiang ◽  
Zhiwen Wang ◽  
Jun Lu ◽  
...  
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Fatigue Damage ◽  
High Speed ◽  
Element Model ◽  
Multiaxial Fatigue ◽  
Railway Bridge ◽  
High Speed Railway ◽  
Steel Truss ◽  
Fatigue Evaluation

Steel-truss-arch bridges have been applied in high-speed railway bridges due to their excellent dynamic and static structural performance. Under the action of high-speed trains, the steel connections between hangers and decks suffer from repeated stresses, inducing potential fatigue problems or even fatigue failure. In this study, a multiaxial fatigue evaluation method was first created and established based on critical damage-plane methodology, following which the fatigue evaluation procedure was also created and recommended. The methodology was applied to real-life strain data from a high-speed railway bridge from which an assessment of fatigue damage and predicted fatigue life was estimated. The connection between the shortest hanger and deck on the downstream side was selected as the target due to its relatively high stress. A multiscale finite-element model of this bridge was created according to the design profile and monitoring results of traffic flow, where the finite-element model was calibrated and validated by comparing the calculation results with the monitoring data. Influence analysis was then carried out to investigate two factors—i.e., the total traffic flow and compositions of freight trains—having effects on the fatigue life of the steel connection. The results indicate that the applied multiaxial fatigue method is suitable for online fatigue evaluation of actual bridges. In addition, by using the multiaxial fatigue method, the fatigue-damage accumulation rate can be nearly 60 times that obtained by the uniaxial fatigue method. If freighting is taken into consideration, the fatigue damage will increase rapidly, and for the case 10% of proportion traffic as freighting, the actual fatigue life is estimated to be shorter than the design life.

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.

scholarly journals Investigation into Multiaxial Character of Thermomechanical Fatigue Damage on High-Speed Railway Brake Disc

Vehicles ◽  
2021 ◽  
Vol 3 (2) ◽  
pp. 287-299
Author(s):  
Chun Lu ◽  
Jiliang Mo ◽  
Ruixue Sun ◽  
Yuanke Wu ◽  
Zhiyong Fan
Keyword(s):  
Fatigue Damage ◽  
High Speed ◽  
Thermomechanical Fatigue ◽  
Multiaxial Fatigue ◽  
Brake Disc ◽  
High Speed Railway ◽  
Loading Methods ◽  
Fatigue Evaluation ◽  
Temperature Strain ◽  
Total Damage

The multiaxial character of high-speed railway brake disc thermomechanical fatigue damage is studied in this work. Although the amplitudes and distributions of temperature, strain and stress are similar with uniform and rotating loading methods, the multiaxial behavior and out-of-phase failure status can only be revealed by the latter one. With the help of a multiaxial fatigue model, fatigue damage evaluation and fatigue life prediction are implemented, the contribution of a uniaxial fatigue parameter, multiaxial fatigue parameter and out-of-phase failure parameter to the total damage is discussed, and it is found that using the amplitude and distribution of temperature, stress and strain for fatigue evaluation will lead to an underestimation of brake disc thermomechanical fatigue damage. The results indicate that the brake disc thermomechanical fatigue damage belongs to a type of multiaxial fatigue. Using a uniaxial fatigue parameter causes around 14% underestimation of fatigue damage, while employing a multiaxial fatigue parameter without the consideration of out-of-phase failure will lead to an underestimation of about 5%. This work explains the importance of studying the thermomechanical fatigue damage of the brake disc from the perspective of multiaxial fatigue.

Local Optimization Analysis of Bailey Beam Bracket Based on Multiscale Model

2019 ◽  
Vol 815 ◽  
pp. 229-234
Author(s):  
Qin Tian ◽  
Cheng Hao Hang ◽  
Zi Xin Wan ◽  
Yun Peng Zou
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Structural Parameters ◽  
Bending Moment ◽  
Element Model ◽  
Railway Bridge ◽  
High Speed Railway ◽  
Finite Element Software ◽  
Steel Cushion ◽  
Structural Measure

In the construction of high-speed railway bridge, the stress of Bailey beam is much higher than that of other parts due to the large local compressive stress and bending moment at the fulcrum. To solve this problem, this paper proposes a structural measure of adding double I-steel cushion between Bailey beam and top beam to alleviate the larger stress at the fulcrum and make the support more uniform. Based on the Bailey beam support system of cast-in-situ high-speed railway bridge of Lianshui County super large bridge, the multi-scale finite element model of Bailey beam support is established by ABAQUS general finite element software, and the influence law of structural parameters of double-jointed I-steel cushion on support stress is analyzed. The research shows that the rigidly of the double-jointed I-beam cushion should not be too large or too small. When the length is appropriate, it can effectively alleviate the problem of excessive stress at the fulcrum of Bailey beam, and is a safe, economical and simple new structural measure.

The Minimum Longitudinal Horizontal Linear-Stiffness of Piers of Typical High-Speed Railway’s Layout of Turnout and Bridge

2011 ◽  
Vol 255-260 ◽  
pp. 3979-3983
Author(s):  
Zhe Liu ◽  
Wang Ping
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Element Model ◽  
Comprehensive Analysis ◽  
Track Structure ◽  
Continuous Beam ◽  
High Speed Railway ◽  
Railway Bridges ◽  
Ballast Track ◽  
Typical Layout

The values of longitudinal horizontal linear-stiffness of piers are very important parameters in the design of welded turnout on bridge and they can have a great impact on the force and displacement of the turnout. The layout form of turnout and bridge of welded turnout structure system on high-speed railway bridges are various, so the values of longitudinal horizontal linear-stiffness of piers have to be limited in order to insure the strength and stability of track structure on bridges and at the same time meet the requirement of comparative displacement of beam and rail, turnout proper and frog. To make the value-taking easy in the design process, a finite element model for welded turnout-bridge-platform is established in this paper, which is based on the principle of longitudinal interaction of welded turnout on bridges. Directing at three typical layout forms (No.18 single turnout+4×32m continuous beam, single crossover+6×32m continuous beam and typical throat point+4×32m continuous beam) of welded turnout and bridge on ballast track, a research of the relation between the force and displacement of turnout, and the values of longitudinal horizontal linear-stiffness of piers has been carried out. Based on the comprehensive analysis, minimal values of longitudinal horizontal linear-stiffness of piers which are suitable for these three kinds of layout forms, and the values are 1000,800 and 1600 kN/cm·double-line respectively.

Study of Bridge Piers Lateral Stiffness in Railway Vehicle-Bridge System

2014 ◽  
Vol 1025-1026 ◽  
pp. 868-871
Author(s):  
Jia Yu Yuan ◽  
Zhi Ping Zeng ◽  
Can Liu ◽  
Xian Feng He ◽  
Kun Teng Zhu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
High Speed ◽  
System Analysis ◽  
Element Model ◽  
Railway Vehicle ◽  
Lateral Stiffness ◽  
Coupled Vibration ◽  
High Speed Railway ◽  
Bridge Model

With the high-speed railway construction, studying of the vehicle-bridge vibration system increasingly important. This article established a range of high-speed trains linear model and standard high-speed railway 32 m span bridge model then a combination of both established based on ANSYS vehicle-bridge finite element model. Followed based on ANSYS high-speed train-bridge Coupled Vibration Simulation Analysis System. Analysis of a variety mound lateral stiffness, According to the analysis results of the piers of the basic principles. The bridge has been established based on the finite element model. Respectively, from the height of piers and pier-shaped two aspects to computational analysis the piers for bridge Coupled Vibration of Dynamic Response of Bridges. Provide a reference for the design of high-speed railway.

Finite Element Analysis of Pier Top Horizontal Displacement Caused by Newly-Built Road under High-Speed Railway Bridge

2013 ◽  
Vol 353-356 ◽  
pp. 823-827 ◽  
Author(s):  
Xin Chuang Liu ◽  
Bing Long Wang ◽  
Long Cai Yang ◽  
Yu Jia
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Road Construction ◽  
Horizontal Displacement ◽  
Railway Bridge ◽  
Element Analysis ◽  
High Speed Railway ◽  
Construction Engineering ◽  
Finite Element Software ◽  
Pile Cap

In order to meet the requirements of high-speed train's safe operation, the horizontal displacement of high-speed railway bridge pier top must be strictly controlled. This paper relies on one road construction engineering beneath an existing high-speed railway bridge. We use 2D finite element software to analyze the magnitude and direction of pier top horizontal displacement caused by road load. We take it into account that the effect of the soil nature on pier top horizontal displacement. The analysis showed that the nature of soil around piles of high-speed railway bridge is closely related to the magnitude and direction of the pier top horizontal displacement. Authors believe that the horizontal displacement of pier top consists of two parts. One is pier top pure horizontal displacement dragged by horizontal displacement of the top of piles, the other is pier top rotation horizontal displacement driven by the rotation of pile cap. The analysis result can be used for the design of road with embankment structure beneath high-speed railway bridge.

Fatigue Life Investigation of a High Pressure Inner Casing Under In-Service Conditions

2016 ◽  
Author(s):  
Hui Hong ◽  
Weizhe Wang ◽  
Zhenwei Cai
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
Fatigue Life ◽  
Fatigue Damage ◽  
High Stress ◽  
Element Model ◽  
Steam Pressure ◽  
Strain Behavior ◽  
Service Conditions ◽  
High Stress Level

The fatigue life of a specific inner casing of an ultra-supercritical steam turbine was investigated under a half year in-service conditions. The Ramberg-Osgood model and Manson-Coffin-Basquin strain-life equation were used to describe the stress-strain behavior and calculate the fatigue damage. A temperature comparison was performed to validate the reliability of finite element model. The results showed that fluctuating steam pressure rather than temperature had more significant effect on the variation of stress in the casing. Locations with high stress level were prone to cause larger fatigue damage. Statistical analysis was carried out to reveal that over half fluctuations of steam pressure could cause damage.

Comfortable Evaluation of Bridge-Station Combined Large Span High Speed Railway Station under Crowd Loading

2014 ◽  
Vol 501-504 ◽  
pp. 911-915
Author(s):  
Yan Li Yu ◽  
Wei Ping Xie ◽  
Wei He
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Flexible Structures ◽  
Element Model ◽  
Waiting Room ◽  
Railway Station ◽  
High Speed Railway ◽  
Large Span ◽  
Vibration Responses ◽  
Combined Structure

Focusing on the Zhengzhou East Railway Station, which is the larges railway staton in China at present and has the characteristics of bridge-station combined structure, the fine finite element model was established by considering the influence of second dead loads. The rational crowd loading models were also determined based on the testing results. The vibration responses of waiting room floor and business floor caused by crowd loading are calculated. The vibration comfort was evaluated by the code of ATC (1999). The calculation and analysis results showed that: (1) the vibration of waiting floor and business floor under crowd get up loading is small, which can satisfy the comfort demand; (2) the vibration of waiting floor and business floor under crowd walk loading is bigger because the frequency of crowd walk loading (2Hz) is closer to the structure first natural frequency, which can satisfy the comfort demand basically and only some individual parts can not satisfy the comfort demand; (3) the vibration caused by crowd loading can not neglected for the large-span flexible structures.

Effects of Pier Deformation on Train Operations within High-Speed Railway Ballastless Track–Bridge Systems

2018 ◽  
Vol 2672 (10) ◽  
pp. 96-105 ◽  
Author(s):  
De Zhang ◽  
Junhua Xiao ◽  
Xiao Zhang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
High Speed ◽  
Element Model ◽  
Lateral Deformation ◽  
Train Track ◽  
High Speed Railway ◽  
Ballastless Track ◽  
Train Operation ◽  
Track Bridge

The deformation of a bridge foundation (i.e. pier) for a ballastless track of a high-speed railway may cause additional irregularities within the track, thereby affecting train operation. By using a unit slab ballastless track bridge system as the research object, this study built a finite element model and a train–track dynamic interaction model. The additional rail deformation caused by the vertical or lateral deformation of a bridge pier was calculated by the finite element model, and then the effects on train operation due to the additional rail deformation were analyzed by the train–track dynamic model. It was found that the lateral deformation of a single pier should be of the most concern for the management and control of a high-speed railway. Specifically, when a pier suffered settlement and lateral deformation concurrently, the evaluation indices of train operation were primarily affected by the magnitude of the lateral deformation, and were only slightly affected by the settlement.

Additional Longitudinal Expansion Force between Continuous Welded Rails and Extra-Long Continuous Bridges of High-Speed Railway

2012 ◽  
Vol 178-181 ◽  
pp. 2304-2307
Author(s):  
Wen Shuo Liu ◽  
Gong Lian Dai
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Element Model ◽  
High Speed Railway ◽  
Long Span ◽  
Spring Element ◽  
Longitudinal Stiffness ◽  
Longitudinal Resistance ◽  
Expansion Force ◽  
Track Bridge

In order to investigate the additional expansion force of continuous welded rails (CWR) on extra-long continuous bridges of high-speed railways, the integrative spatial finite element model of track-bridge-pier system is established with the nonlinear spring element simulating the longitudinal resistance between track and bridge. In this paper, the influences of several parameters to the additional expansion force of CWR are studied, including the different resistance models, the number of main spans, the arrangement of adjacent bridges as well as the pier’s longitudinal stiffness. Some conclusions are drawn through comparisons and analysis, which could provide valuable references for design and application of long-span continuous bridges on high-speed railways.

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