70. Seismic performance of tuned mass damper on Shazand Railway Bridge induced by train

R. Latifi1, R. Razani2

1School of Civil Engineering, Shiraz University of Technology,
Podonak str., 14, Shiraz, Iran, Tel. 98-0917-100-2630

2School of Civil Engineering, Shiraz University, Shiraz, Iran

1Corresponding author

E-mail: 1r.latifi@sutech.ac.ir, 2razani@shirazu.ac.ir

(Received 15 June 2015; received in revised form 4 August 2015; accepted 12 August 2015)

Abstract. Shazand Railway Bridge is located in Markazi province, Iran in north to south‑west railway. The bridge consists of ten spans. In 1984, during Iran-Iraq war, thatís main span, which has a length of 72 m, was attacked and severely damaged. Eight month later, damaged span replaced with a steel deck. The deck is straight in plan, but the railway is curved and this causes eccentricity. Excessive vibration was observed during the train passage. Although the bridge was retrofitted in two stages, the problem has not been solved yet, and the trainsí speed should be reduced to around 10 km/h in order to avoid excessive vibration. The present study addressed the effectiveness of tuned mass damper (TMD) in reducing train-induced vibrations of Shazand Railway Bridge. A three dimensional finite-element model of the bridge is developed and dynamic time history analyses under train passage in both as-built and passively controlled with TMD are conducted. Sensitivity analyses are performed to demonstrate the effects of the damper parameters on structural response. The results show that considerable reduction in acceleration response of the bridge can be achieved by employing proper TMD.

Keywords: Shazand Railway Bridge, vibration, tuned mass damper.

References

[1]        Frahm H. Device for Damping Vibrations of Bodies. US Patent #989958, 1909.

[2]        Den Hartog J. P. Mechanical Vibration. McGraw-Hill, New York, 1956.

[3]        Kwon H. C., Kim M. C., Lee I. W. Vibration control of bridges under moving loads. Computers and Structures, Vol. 66, Issue 4, 1998, p. 473‑480.

[4]        Wang J. F., Lin C. C, Chen B. L. Vibration suppression for high-speed railway bridges using tuned mass dampers. International Journal of Solids and Structures, Vol. 40, 2003, p. 465‑491.

[5]        Jianzhong L., Mubiao S. The resonant vibration for a simply supported girder bridge under high speed trains. Journal of Sound and Vibration, Vol. 224, Issue 5, 1999, p. 897‑915.

[6]        Sadek F., Mohraz B., Taylor A. W., Chung R. M. A method of estimating the parameters of tuned mass dampers for seismic applications. Earthquake Engineering and Structural Dynamics, Vol. 26, 1997, p. 617‑635.

[7]        Evaluation of human exposure to whole-body vibration. Part 2: continuous and shock-induced vibration in buildings (1_80 Hz). International organization for standards, ISO-2631/2-(E), Geneva, Switzerland, 1989.

Cite this article

Latifi R., Razani R. Seismic performance of tuned mass damper on Shazand Railway Bridge induced by train. Journal of Measurements in Engineering, Vol. 3, Issue 3, 2015, p. 55‑62.

 

Journal of Measurements in Engineering. September 2015, Volume 3, Issue 3
© JVE International Ltd. ISSN Print 2335-2124, ISSN Online 2424-4635, Kaunas, Lithuania