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Proceedings 2018, 2(8), 379; https://doi.org/10.3390/ICEM18-05209

The Cause Estimation of Damages in Pathein Suspension Bridge Based on Vibration Measurements

Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan
Presented at the 18th International Conference on Experimental Mechanics, Brussels, Belgium, 1–5 July 2018.
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Published: 9 May 2018
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Abstract

Pathein suspension bridge situated in Pathein City in the south of Myanmar has shown various symptoms of damage, and the safety of the bridge is questionable. The authorities concerned reported that the bridge has undergone severe deterioration since its construction, involving the towers’ inclination, excessive deflections, bearing failure, heavy corrosion of main cables and hangers, hangers’ inclination, and slippage of clamps. The deformed shape of the stiffening girder was found to be unusual, with maximum deflection nearer to the towers; however, in a single span bridge, such as Pathein Bridge, the maximum deflection is expected to be at mid-span. This paper will explain the possible reasons for the unusual excessive deformations in the stiffening girder and bearing failure. The tension force of hangers was estimated based on vibration measurements, and the distribution of hangers’ tension force along the bridge’s span was found to be non-uniform with low-tension force in hangers closer to the towers. The non-uniform distribution of the hangers’ tension force is possibly due to shortcomings of the design of the cable system. The towers’ inclination has caused the road level to drop down; however, the unusual deformations in stiffening girder are attributed to the non-uniform distribution of the tension force in the hangers. Low-tension force in the hangers near the towers caused the bearing to carry excessive force, which eventually caused the bearing to fail; the bearing was rehabilitated by adding steel rollers.
Keywords: suspension bridges; structural deterioration; tension force estimation; accelerometer; vibration measurements; cause estimation suspension bridges; structural deterioration; tension force estimation; accelerometer; vibration measurements; cause estimation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Hegeir, O.; Mizutani, T.; Matsumoto, K.; Nagai, K. The Cause Estimation of Damages in Pathein Suspension Bridge Based on Vibration Measurements. Proceedings 2018, 2, 379.

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