scholarly journals Dynamic responses of a steel composite bridge subjected to a moving high speed train load in comparison with a PSC box girder bridge

2014 ◽  
Author(s):  
S. Kim ◽  
H. Kim ◽  
J. Lee
Keyword(s):  
High Speed ◽  
Dynamic Responses ◽  
High Speed Train ◽  
Box Girder ◽  
Composite Bridge ◽  
Steel Composite ◽  
Box Girder Bridge ◽  
Girder Bridge

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.

Parametric study of design variations on the vibration modes of box girder bridges

1991 ◽  
Vol 18 (5) ◽  
pp. 789-798 ◽  
Author(s):  
M. S. Cheung ◽  
A. Megnounit
Keyword(s):  
Finite Element ◽  
Moving Load ◽  
Dominant Mode ◽  
Rate Of Change ◽  
Dynamic Responses ◽  
Human Response ◽  
Element Analysis ◽  
Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge

Under a moving load, a bridge undergoes deflections and stresses which significantly exceed those caused by the same load when applied statically. These dynamic deflections can cause discomfort to pedestrians using the bridge, since human response is sensitive to accelerations and to the rate of change of acceleration. Another factor affecting human response is the type of vibration in the dominant mode. People tend to react more adversely to torsional modes of vibration than to flexural modes. This paper summarizes the results of an extensive analytical investigation, which was conducted to identify key parameters affecting the changes of dominant mode types and to study the influence of diaphragms and cross bracings on dynamic responses of a twin box girder bridge. The finite element method was used to carry out these analyses. The analytical results indicate that the provision of diaphragms within the boxes at each support, or of a cross-bracing system in-between boxes, can effectively reduce peak accelerations when the dominant mode of vibration is torsional. As a result, the human discomfort and perception to vibration can be improved. Key words: vibration, human response, torsion, flexure, box girder bridge, diaphragm, cross bracing, finite element analysis.

Simply Supported Box Girder Bridge Vibration Control with MR-TMD

2011 ◽  
Vol 90-93 ◽  
pp. 1010-1014 ◽  
Author(s):  
Xi Jun Liu ◽  
Xiao Qin Yuan ◽  
Su Xia Zhang
Keyword(s):  
Vibration Control ◽  
High Speed ◽  
Vertical Displacement ◽  
Control Device ◽  
Vibration Acceleration ◽  
Box Girder ◽  
Simply Supported ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Track Irregularities

MR-TMD is a new type of semi-active control device which combines with Tuned Mass Damper (TMD) and a Magnetorheological (MR) Damper. Taking German ICE3 high-speed railway train through 32meters simply supported box girder bridge for example, a dynamical model of Train-Bridge coupling vibration system is established by considering track irregularities. The relations between the bridge vibration and track irregularities with dampers are studied and the effects of vibration control with TMD and MR-TMD on the bridge are comparatively analyzed. The results show that the effects of track irregularities on vertical displacement of the bridge are relatively small, but on vibration acceleration are relatively large. As the train speed increases, the effects of track irregularities on the vibration acceleration is lager. As the track irregularities increase, the accelerations are greater. MR-TMD is able to inhibit vibration of bridge effectively, and has a wider control range and frequency bandwidth.

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