Creep Effect on the Dynamic Response of Train-Track-Continuous Bridge System

Xiang, Ping; Wei, MingLong; Sun, Mengmeng; Li, Qiusheng; Jiang, Lizhong; Liu, Xiang; Ren, Jianying

doi:10.1142/s021945542150139x

Cited by 21 publications

(6 citation statements)

References 46 publications

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“…Besides, a subgrade section with a length of 400 m is manually added to the model for eliminating the boundary effect of the rails in the subgrade section. The accuracy of this TTBS model was verified by comparing the field measured data with the model calculation results (Xiang et al 2021).…”

Section: Wheel-rail Contactmentioning

confidence: 94%

Definition and Quantified Research of Track Structural Damage Index of High-speed Railway Girder Bridge

Wei

Jiang

et al. 2022

Preprint

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The classification and quantitative description of damage of track structure for high-speed railway girder bridges (HRGBs) are still in the exploratory stage, which seriously interferes with the performance-based seismic damage assessment of HRGBs. In view of this, firstly, from the safety and stability of train operation, this paper defines the damage grade of track structure (intact, slight, moderate, severe and complete damage state) by refining the train operation index value. Secondly, based on the simple supported and continuous girder bridge structures of high-speed railway, the train-track-bridge system (TTBS) model is established, and the additional lateral irregularities of the rail caused by the lateral deform of the girder after the earthquake are induced. Finally, the influence of the lateral displacement amplitude of the rail and the train velocity on the train safety and stability is discussed. The results indicate that the rail lateral displacement by the reverse translation of the adjacent simply supported spans and the reverse rotation of the adjacent simply supported spans have the greatest impact on the train safety and stability, respectively. The lateral displacement of rail is proposed as an index to measure the damage of the track structure, and its critical value corresponding to each damage grade in the range of train velocity from 200km/h to 400km/h is determined, which can be used for the seismic vulnerability analysis of track structures for HRGBs.

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Section: Wheel-rail Contactmentioning

confidence: 94%

Definition and Quantified Research of Track Structural Damage Index of High-speed Railway Girder Bridge

Wei

Jiang

et al. 2022

Preprint

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“…The parameters and layout of the bridge structure have been explained in Ref. [26]. The train adopts the CRH2 model of the Chinese high-speed multiple unit train, consisting of 2 multiple units and 6 trailers, with a total of 8 car bodies.…”

Section: Validation Of Kle-pem Methodsmentioning

confidence: 99%

“…The bridge models selected for the deterministic and uncertainty analysis of vehicle dynamic response are both continuous beam bridges and simply supported beam bridges, with a total of 7 spans and a length of 304 m. The train adopts the CRH2 model of China High Speed Multiple Unit, as shown in Figure 2, and the bridge and train parameters are in Ref. [26]. The main difference between deterministic analysis and uncertainty analysis of train dynamic response lies in the initial unevenness of the track.…”

Section: Comparison Of Train Certainty Analysis and Uncertainty Analysismentioning

confidence: 99%

Dynamic Responses of Train-Symmetry-Bridge System Considering Concrete Creep and the Creep-Induced Track Irregularity

Li,

Ma,

Wei

et al. 2023

Symmetry

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This work considers the influence of concrete creep on track irregularities and establishes the dynamic motion equation of the train-track-bridge coupling system. The track irregularity is obtained by superposition of the initial geometric irregularity and additional geometric irregularity of the steel rail caused by creep. When high-speed railway trains pass through bridges; the vertical acceleration and vertical displacement of continuous beam bridges are related to the train’s operating speed, and the influence of creep camber is relatively small. At the same time, considering the randomness of track irregularities, the dynamic responses of the train track bridge coupling system under the action of random track irregularities are analyzed, and the dynamic responses of trains at different operating speeds are obtained. The deterministic and uncertain dynamic responses of the train track bridge system were compared and analyzed to verify the accuracy of the Karhunen Loéve expansion (KLE)-Point estimate method (PEM) calculation results. The results indicate that the random characteristics of track irregularities have a significant impact on train dynamic response. Based on the random system vibration analysis and considering the safety and comfort indicators of high-speed railway trains, the creep deformation limit of a continuous beam bridge with a length of 48 m + 80 m + 48 m is obtained to be 19 mm. This is the first time that the dynamic responses of train-symmetry-bridge system are calculated by considering concrete creep and the creep-induced track irregularity, which has certain significance for understanding the dynamics of train -bridge system. In addition, the proposed creep threshold is also of great significance to ensure the safety of traveling.

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“…Gong [9] studied the in uence of spatially varying ground motion on the dynamic behavior of a train passing through a cablestayed bridge. Xiang [10] investigated the in uence of the track irregularity and deck deformation on the running safety of HSR trains. Chen [11] studied the in uence of track sti ness on dynamic behaviors of the high-speed vehicletrack-bridge dynamic system.…”

Section: Introductionmentioning

confidence: 99%

“…And the secondary dead load is applied to the girder body by increasing the bulk density of materials. Because the concrete bridge will arch due to the creep, which will in uence the running stability of the vehicle [10,18], the creep is taken as the initial deformation of the bridge deck in the model. e uniform sti ness matrix and the uniform mass matrix are adopted in dynamic analysis with Rayleigh damping.…”

Section: Introductionmentioning

confidence: 99%

Study on the Vertical Stiffness of Bridge Expansion Joints Based on the Vehicle-Track-Bridge Coupled Model

Wang

Gao

Yang

2022

Shock and Vibration

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Bridge expansion joints (BEJs) are equipped at the girder end of long-span railway bridges to ensure the reliable transition of the track. BEJs should have suitable dynamic stiffness to ensure the running safety and stability of the vehicle. To explore the influence of dynamic vertical stiffness of BEJs on the dynamic response of vehicle, track, and bridge, a three-dimensional vehicle-track-bridge coupled model is established, and the influence of sleeper spacing and vehicle speed are taken into consideration. Taking a high-speed railway line in China as a case study, the dynamic response of the whole system is calculated. The results show that (1) the dynamic response of BEJs and the vehicle is affected by the vehicle speed and sleeper spacing. With the increase of vehicle speed and sleeper spacing, the dynamic response of the system increases; (2) the vertical stiffness of BEJs will affect the dynamic response of BEJs and the interaction between the wheel and rail: the vertical dynamic displacement of movable sleeper will exceed the limit if the vertical stiffness of pressure-bearing is insufficient, and the wheel unloading rate may exceed the limit if the vertical stiffness of the cushion plate is insufficient. Based on the results, the larger vertical stiffness of the cushion plate and pressure-bearing is recommended. These results have been applied to the design of BEJs on the studied railway line, which are in good service condition at present.

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Creep Effect on the Dynamic Response of Train-Track-Continuous Bridge System

Cited by 21 publications

References 46 publications

Definition and Quantified Research of Track Structural Damage Index of High-speed Railway Girder Bridge

Definition and Quantified Research of Track Structural Damage Index of High-speed Railway Girder Bridge

Dynamic Responses of Train-Symmetry-Bridge System Considering Concrete Creep and the Creep-Induced Track Irregularity

Study on the Vertical Stiffness of Bridge Expansion Joints Based on the Vehicle-Track-Bridge Coupled Model

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