Diagnostics of an Existing Cable-Stayed Bridge by Means of the Dynamic Load Test

Abstract:

The cable-stayed bridge at the inner ring road in Prague in the Czech Republic was put into operation in 1997. In 2008 a crack was found in the bridge structure area where the end beam was connected with the upper deck of the box section and where the bridge expansion joint system was anchored. The basic objective of diagnostic works, which were started immediately after the finding of the crack, was obtaining the basis for bridge structure modifications, among other things, to prevent formation of similar damages in the future. A series of diagnostic methods was used for determination of the bridge actual state and the real static and dynamic bridge behavior. One of these methods was the dynamic load test. It was focused on an examination of the bridge forced vibration which was caused by dynamic effects of a usual traffic flow. An arrangement of the test was not quite usual because the experiment was concentrated on dynamic behaviour of bridge support areas especially. The abutment area, the pylon area and the area of a pillar with the bearing with a tensile structural element were observed on the investigated bridge. The dynamic load test was performed in two stages. The first stage was focused on investigation of bridge dynamic behaviour in original structural conditions and on obtaining the basis for design of bridge adjustments. The second stage was realized after bridge reconstruction in December 2012 and verified the effectiveness of bridge modifications.

• Periodical: Applied Mechanics and Materials (Volume 769)
• Pages: 200-205
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.769.200
• Online since: June 2015
• Authors: Michal Polak*, Petr Fajman, Jiri Maca, Tomáš Plachy
• Keywords: Cable-Stayed Bridge, Damage, Diagnostics, Dynamic Loading Test, Traffic Flow

References

[1] M. Polak, T. Plachy, Determination of Forces in Roof Cables at Administrative Center Amazon Court, in: J. Procedia Engineering, Volume 48 (2012), p.578 – 582.

DOI: 10.1016/j.proeng.2012.09.556

[2] M. Polak, T. Rotter, T. Plachy, Long-time monitoring of the bridge response caused by heavy traffic and temperature changes, in: Proceedings of 49th International Conference on Experimental Stress Analysis (EAN 2011), June 6-9, 2011, Brno University of Technology, Znojmo, Czech Republic, pp.341-348.

[3] M. Polak, T. Rotter, T. Plachy, Vibration Monitoring of the Bridge Loaded by Heavy Vehicle Traffic, in: Proceedings of the 5th WSEAS International Conference on Applied and Theoretical Mechanics (MECHANICS '09), December 14-16, 2009, World Scientific and Engineering Academy and Society (WSEAS), Puerto de la Cruz, Spain, pp.120-123.

[4] M. Polak, P. Fajman, J. Maca, T. Plachy, The Dynamic Load Test and Diagnostics of an Existing Cable Stayed Bridge, in: Proceedings of 12th International Conference on New Trends in Statics and Dynamics of Building, October 16-17, 2014, Faculty of Civil Engineering STU Bratislava, Bratislava, Slovakia, pp.415-432.

DOI: 10.4028/www.scientific.net/amm.769.200