scholarly journals Bayesian estimation of instantaneous frequency reduction on cracked concrete railway bridges under high-speed train passage

2021 ◽  
Vol 161 ◽  
pp. 107944
Author(s):  
Kodai Matsuoka ◽  
Munemasa Tokunaga ◽  
Kiyoyuki Kaito
Keyword(s):  
Bayesian Estimation ◽  
Instantaneous Frequency ◽  
High Speed ◽  
High Speed Train ◽  
Railway Bridges ◽  
Cracked Concrete

scholarly journals Effect of High-Speed Train-Induced Wind on Trackside UAV Thrust Near Railway Bridge

2020 ◽  
Vol 10 (10) ◽  
pp. 3495 ◽  
Author(s):  
Hyuk-Jin Yoon ◽  
Su-Hwan Yun ◽  
Dae-Hyun Kim ◽  
Jae Hee Kim ◽  
Bong-Kwan Cho ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Wind Velocity ◽  
High Speed ◽  
Railway Bridge ◽  
High Speed Train ◽  
Box Girder ◽  
Railway Bridges ◽  
High Speed Trains ◽  
Thrust Measurement ◽  
Girder Bridge

Imaging devices attached to unmanned aerial vehicles (UAVs) are used for crack measurements of railway bridges constructed for high-speed trains. This research aims to investigate track-side wind induced by high-speed trains and its effect on UAV thrust near the railway bridge. Furthermore, the characteristics of train-induced wind in three axial directions along a track, wind velocity, and the effect of train-induced wind on the UAV thrust were analyzed. This was achieved by installing 3-axis ultrasonic anemometers and a UAV thrust measurement system on top of a PSC box girder bridge. The changes in the train-induced wind velocity were monitored along the train travel, width, and height directions. The train-induced wind was measured at distances of 0.8, 1.3, 2.3, and 2.8 m away from the train’s body to analyze wind velocity based on distance. It was found that the maximum wind velocity decreased linearly as the distance from the train’s body increased. The UAV thrust increased by up to 20% and 60%, owing to train-induced wind when the leading and trailing power cars of a high-speed train passed, respectively. Thus, it is necessary to conduct further research to develop robust control and a variable pitch-propeller that can control thrust.

scholarly journals Dynamic Analysis of an Existing Arch Railway Bridge According to Eurocodes

2016 ◽  
Vol 62 (4) ◽  
pp. 99-118 ◽  
Author(s):  
R. Oleszek ◽  
W. Radomski
Keyword(s):  
Dynamic Analysis ◽  
Modal Analysis ◽  
Structural Dynamics ◽  
High Speed ◽  
Bending Moments ◽  
Railway Bridge ◽  
High Speed Train ◽  
Arch Bridge ◽  
Railway Bridges ◽  
Structural Solutions

AbstractModern regulations concerning railway bridges are based on the approach of structural dynamics, which is described in PN-EN standards. This paper presents the results of theoretical dynamic analysis of the HSLM-A train set loading on the structure of a pre-stressed concrete arch bridge - the first railway bridge of its type which was built in Poland (completed in 1959). The recommendations of PN-EN have been followed and modal analysis was carried out to define the sensitivity of the structure to chosen eigenforms. Additionally the paper presents a course of calculations and the conclusions obtained from the analysis of displacements, accelerations, and bending moments induced in the structure through a simulated passage of a high-speed train in the context of the requirements of PN-EN Standards. The conclusions from the current calculations can be used for dynamic analysis of bridges of similar structural solutions.

Dynamic Behavior of Railway Bridges Under High-Speed Train Loads

2000 ◽  
Vol 16 (18) ◽  
pp. 629-634
Author(s):  
Sungil KIM ◽  
Jongwon KWARK ◽  
Sungpil CHANG
Keyword(s):  
Dynamic Behavior ◽  
High Speed ◽  
High Speed Train ◽  
Railway Bridges

Running safety evaluation of high-speed train subject to the impact of floating ice collision on bridge piers

2021 ◽  
pp. 095440972110100
Author(s):  
Penghao Li ◽  
Zhonglong Li ◽  
Zhaoling Han ◽  
Shengyang Zhu ◽  
Wanming Zhai ◽  
...  
Keyword(s):  
High Speed ◽  
Ride Comfort ◽  
Dynamic Responses ◽  
Impact Loads ◽  
High Speed Train ◽  
Train Track ◽  
Railway Bridges ◽  
Running Safety ◽  
Track Bridge ◽  
The Impact

In Northeast China and the areas along Sichuan-Tibet railway, collision between floating ice and piers of railway bridges seriously threatens the train operation safety. The safety of high-speed train running on the bridge subject to the impact of floating ice collision is rarely assessed considering the spatial interaction of the train-track-bridge-ice system. To evaluate the running safety and ride comfort of trains and the structural stability of railway bridges under the collision between floating ices and piers, a train-track-bridge (TTB) dynamic interaction model considering the impact of floating ice is established. Using the refined finite element model, the collision process of floating ice on bridge pier is simulated, and the impact loads are employed as the excitation input of the TTB dynamics model. Taking a 5 × 32 m simply-supported bridges as a case study, the influence of bridge structural parameters on the floating ice collision system is investigated, and then the dynamic responses of the TTB system induced by the floating ice impact loads are analyzed in detail. Finally, the effect of the ice impact loads on the running safety of the high-speed train is revealed. Results show that under the floating ice impact loads, the angle of the pier sharp-nose (APSN) and lateral stiffness of foundations are the key parameters that influence the dynamic responses of the bridge, and an improperly small lateral stiffness of foundation would lead to an instability of bridge structure. The influence of ice impact loads on the dynamic responses of the train is remarkable. The lateral vibration acceleration, derailment factor and lateral wheel rail force caused by the ice impact loads are all greater than those caused by the track irregularity, while the wheel unloading rate is slightly smaller. In addition, the running speed of train is also closely related to the running safety and ride comfort when the collision occurs. When the train speed exceeds 400 km/h, the train passing through the bridge would have the possibility of derailment.

scholarly journals Dynamic Analysis of Historic Railway Bridges in Poland in the Context of Adjusting Them to Pendolino Trains

2015 ◽  
Vol 20 (2) ◽  
pp. 283-297 ◽  
Author(s):  
K. Grębowski ◽  
M. Zielińska
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Model ◽  
High Speed ◽  
Experimental Studies ◽  
Rolling Stock ◽  
Railway Bridge ◽  
High Speed Train ◽  
Railway Bridges ◽  
High Speed Trains ◽  
Identical Type

Abstract The article presents the dynamic analysis of the historic railway bridge in Tczew as an example of the usefulness of such type of bridge for high-speed trains. The model of the bridge and the simulation of rolling stock passage was performed in SOFISTIK program. The scope of work includes experimental studies, the solution of the problem concerning the correct solution features of the dynamic model which takes into account the dependencies between the bridge, track and rolling - stock (RBT). The verification of the model was performed by comparing the results obtained on site during the passage of ET-22 locomotive and twenty (20) open goods wagons with the results obtained in the program for the identical type of rolling stock used to the simulation Pendolino train. Then, after the verification, the simulation of high-speed train passage was performed. The speed of the train passage varied from 150 [km/h] to the max. possible speed of 250 [km/h] which PENDOLINO train, approved for the simulation, may reach. Under the analysis of obtained results it was possible to define the conditions for adjusting the historic bridge to high-speed train passage.

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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