Efficient 1D model for blind assessment of existing bridges: simulation of a full-scale loading test and comparison with higher order continuum models

Abstract

Assessing the structural performance of existing concrete bridges is nowadays a major task. Nonlinear finite element (FE) analysis can quantify their capacity, evaluate strengthening interventions and prevent premature dismantle. However, this technique, mainly performed with 2D/3D FE, is seldom used at true scale due to the great complexity and computational costs involved. In this paper, the loading test of a strengthened concrete bridge in Sweden (Örnsköldsvik) is simulated using a 1D model. The bridge failed in combination of shear–bending–torsion triggered by fibre-reinforced polymer bond failure. Consecutive levels of refinement of the 1D model are presented and available results from higher order models are compared. The study of the structural response involved comparing displacements, strains, cracking patterns and failure mechanisms. The demonstrated robustness and efficiency of the proposed model makes it adequate for blind assessments of existing bridges.

Keywords::

• bridge assessment
• full-scale test
• nonlinear finite element analysis
• fibre beam model
• shear
• fibre-reinforced polymer

Acknowledgements

The authors gratefully acknowledge the authorisation given by Prof. Björn Täljsten and Dr Gabriel Sas to use the original figures of the Örnsköldsvik bridge in this research paper.

Notes

^1. Email: [email protected]

^2. Email: [email protected]

Additional information

Funding

The present research has been carried out with the support of the projects ‘Performance-based-design of partially prestressed concrete structures. Proposal of new design methodology, experimental verification and design criteria’ [grant number BIA2012-36848] and ‘Assessment of damaged and strengthened concrete structures’ [grant number BIA2009-11764], co-financed by the Spanish Ministry of Economics and Competitiveness and the European Funds for Regional Development (FEDER). The Postdoctoral Fellowship conceded by the Government of Catalonia (ref. 2013 PDJ 00022) to the first author is also gratefully acknowledged.