Multi-tool inspection and numerical analysis of an old masonry arch bridge

Abstract

Complex special inspection of an old masonry arch bridge according to the Guideline on Inspection and Condition Assessment of Railway Bridges and numerical analysis of the structure are presented. The guideline summarises recommendations for the step-by-step investigation of railway bridges applying enhanced methods developed during the EU-funded project Sustainable Bridges. For the investigation of the arch barrel, the ballast parameters and the inner structure of the backfill behind the arch barrel a number of various advanced non-destructive and minor-destructive testing methods were applied. Deformation of the structure during load tests was measured using three independent measuring systems: laser vibrometer, LVDT and microwave radar. Results of calculations performed with 2D and 3D models based on FEM are compared with the field load tests. Sensitivity of the ultimate load of the structure to investigated parameters is studied in FE model. Some general conclusions according to methods of testing and modelling of masonry arch bridges are presented and discussed.

Keywords:

• masonry bridges
• non-destructive testing
• bridge inspection
• finite element method

Acknowledgements

The presented case study was funded by the European Commission in the integrated project Sustainable Bridges – Assessment for Future Traffic Demands and Longer Lives, a part of the 6. Framework Programme. The non-destructive tests carried out by the authors were supported by the Polish Railways PKP PLK SA. The numerical analyses were carried out by means of the system ABAQUS 6.5 at WCSS of Wrocław University of Technology. All these supports are gratefully acknowledged.