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Dynamic Tests of Pony Truss Railway Bridge Under Normal Operation

Stefan PRADELOK

Stefan PRADELOK

PhD; Faculty of Civil Engineering, The Silesian University of TechnologyGliwice, Poland
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PRADELOK, Stefan
 y 
Grzegorz POPRAWA

Grzegorz POPRAWA

PhD; Faculty of Civil Engineering, The Silesian University of TechnologyGliwice, Poland
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POPRAWA, Grzegorz
  
09 ene 2025
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Publicado en línea: 09 ene 2025
Páginas: 63 - 70
Recibido: 22 may 2023
Aceptado: 18 oct 2023
DOI: https://doi.org/10.2478/acee-2024-0005
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© 2024 Stefan PRADELOK et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Bridge under study
Bridge under study

Figure 2.

Cross section of the the sixth span of discussed bridge with spatial transducer layout; suffix y denotes the transverse uniaxial sensor, z denotes the vertical uniaxial sensor and yz denotes the transverse and vertical biaxial sensor
Cross section of the the sixth span of discussed bridge with spatial transducer layout; suffix y denotes the transverse uniaxial sensor, z denotes the vertical uniaxial sensor and yz denotes the transverse and vertical biaxial sensor

Figure 3.

Accelerometer layout in spans no. five (on the right) and six (on the left)
Accelerometer layout in spans no. five (on the right) and six (on the left)

Figure 4.

Comparison of mode shapes estimated from experimental data and calculated using the FE model; a) low order mode shape; b) higher order mode shape
Comparison of mode shapes estimated from experimental data and calculated using the FE model; a) low order mode shape; b) higher order mode shape

Figure 5.

Vertical displacements induced by a heavy locomotive (L1); span 6 – on the left, span 5 – on the right
Vertical displacements induced by a heavy locomotive (L1); span 6 – on the left, span 5 – on the right

Figure 6.

Vertical displacements induced by a locomotive of a freight train (T3); span 6 – on the left, span 5 – on the right
Vertical displacements induced by a locomotive of a freight train (T3); span 6 – on the left, span 5 – on the right

Summary of recorded real train passages

No. Code name Description direction of passage Accelerometer setup Hour of pasage
1 T1 Freight train Forst-Zasieki U1 11:27
2 T2 Freight train Forst-Zasieki U1 13:11
3 T3 Freight train Zasieki-Forst U2 15:00
4 L1 Heavy locomotive Forst-Zasieki U2 15:16
5 O1 Railcar Zasieki-Forst U1 16:33
6 O2 Railcar Forst-Zasieki U1 16:41

FEM predicted and identified modes of vibration

FEM nOMA/nt OMA Times identified Mode shape description
No. nt [Hz] nOMA [Hz] UnOMA [Hz] ξ [%] Uξ [%]
1 5.70 0.81 4.60 0.02 0.66 0.28 9 I lateral bending
2 7.29 1,07 7.83 0.14 1.24 1.33 9 I vertical bending
3 10.50 0.97 10.14 0.11 0.38 0.13 8 I torsional along x axis
4 10.94 0.92 10.06 - 0.46 - 1 II upper flange in phase
5 11.43 0.96 10.95 0.10 0.29 0.09 9 I upper flange out of phase
6 11.76 1.03 12.11 0.03 0.28 0.16 9 II upper flange out of phase
7 12.44 1.08 13.40 - 0.41 - 2 III upper flange out of phase
8 12.78 1.07 13.68 - 1.38 - 1 III upper flange in phase
16 15.48 - - - - 0 IV upper flange in phase
17 15.51 - - - - 0 IV upper flange out of phase
19 17.98 0.95 17.06 0.12 0.79 0.46 9 I torsional
20 20.69 - - - - 0 II lateral bending
21 21.82 - - - - 0 V upper flange in phase
22 21.88 - - - - 0 V upper flange out of phase
23 22.47 0.95 21.27 - 0.34 - 3 II lateral bending
24 29.52 - - - - 0 III lateral bending
25 28.22 - - - - 0 II torsional
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