Analysis of Influencing Factors of Welded Turnout Slab with Convex Block of Ballastless Track on Bridge

2011 ◽  
Vol 71-78 ◽  
pp. 1664-1668
Author(s):  
Yuan Xing Hao ◽  
Feng Dai ◽  
Rong Shan Yang
Keyword(s):  
Influencing Factors ◽  
Longitudinal Force ◽  
The Other ◽  
Continuous Beam ◽  
Computation Model ◽  
Temperature Range ◽  
Ballastless Track ◽  
Continuous Beam Bridge ◽  
Calculation Results ◽  
Beam Bridge

To figure out the structure and influencing factors of welded welded turnout slab convex block of ballastless track on bridge, according to the characteristics of force and displacement of welded turnout on bridge, the turnout-bridge-platform integration computation model was established by finite element method. Taking the ballastless turnout on a continuous beam bridge as the example, the longitudinal force and displacement of the bridge and parts of the turnout was obtained by the means of changing the numbers of slab, the stiffness of convex block support and the temperature range of slabs. The calculation results indicate: using three slabs is reasonable for the ballastless turnout on bridge; The stiffness of convex block supports on slabs should be set between 250kN/mm and 300kN/mm; Since the change of longitudinal force is very large, while the other parameters change little, with the change of the temperature range of slabs, slabs in turnout should be strengthen.

Bridge Structure Detection Based on Load Test

2013 ◽  
Vol 438-439 ◽  
pp. 891-893
Author(s):  
Yan Zeng ◽  
Yong Zeng
Keyword(s):  
Working Condition ◽  
Load Test ◽  
Normal Operation ◽  
Bridge Structure ◽  
Continuous Beam ◽  
Loading Method ◽  
Structure Detection ◽  
Continuous Beam Bridge ◽  
Calculation Results ◽  
Beam Bridge

By the detection of a three spans continuous beam bridge, the detection loading method and arrangement of measuring points are discussed, the static and dynamic detection results such as the deflection, stress and inherent vibration frequency are comparative analyzed with those of theoretical calculation. Results show that the bridge is safe under actual working condition, which provides the basis for normal operation and maintenance of the bridge.

Influences of Rail Expansion Joint on Jointless Turnout on Ballasted Continuous Beam Bridge

2011 ◽  
Vol 48-49 ◽  
pp. 611-616
Author(s):  
Rong Chen ◽  
Wang Ping ◽  
Bin Wang
Keyword(s):  
Longitudinal Force ◽  
Relative Displacement ◽  
Continuous Beam ◽  
Expansion Joint ◽  
Simply Supported ◽  
Continuous Beam Bridge ◽  
Ballasted Track ◽  
Expansion Range ◽  
Stress And Deformation ◽  
Beam Bridge

Based on turnout/bridge interaction principle and finite element method (FEM), an integrated turnout/beam/pier model of jointless turnout on ballasted track was established to analyze the influences of expansion joint on stress and deformation of the turnout. The results are concluded as follows: whether the rail expansion joint is set in front of or behind the turnout, expansion additional force of stock rail will be reduced greatly at the end of the beam; so do the expansion displacement of switch rail and nose rail, the stress of displacement restrictor and spacer block, rail break gap and the longitudinal force of one rail after the other rail broke. But when the expansion joint is set in front of the turnout, the pier’s longitudinal force of continuous beam bridge and the simply supported beam bridge (within the expansion range of the device) increase greatly. When the device is close to the turnout, longitudinal relative displacement of the stock rail to the girder also increases a lot. By comparison, it is more favorable to set the expansion joint behind the turnout, or to set the device at the both ends of the continuous beam, or to set the device at the ends of continuous beam rather than in the center of the span.

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