Risk assessment of the K-bridge over the Danube

Kövesdi, Balázs Géza and Kollár, Dénes and Dunai, László and Hodik, Z. (2024) Risk assessment of the K-bridge over the Danube. In: Bridge Maintenance, Safety, Management, Digitalization and Sustainability. CRC Press/Balkema, Boca Raton, pp. 3231-3239. ISBN 9781032770406; 9781003483755

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Abstract

The K-bridge spans over the Danube between Buda and the Hajógyári Island in Budapest, Hungary. The originally railway, recently mixed road and pedestrian bridge have a more than 70-year-old steel truss main girder with a span of 98.04 m and a steel-concrete deck system. It plays an important role in Budapest city life and is heavily used during the Sziget festival, one of the biggest festivals in Europe. In 2022, during the regular bridge inspection, heavy corrosion and material loss were found by the experts in the bridge deck system and on the steel cantilever beams under the pedestrian walkways. The Budapest University of Technology and Economics (BME), Department of Structural Engineering together with design and maintenance experts investigated the condition of the structure and made a probabilistic analysis to verify the resistance of the corroded structure and made the risk assessment before the organization of the Sziget festival. The main aim of the analysis was the assessment of the load-bearing capacity of the corroded structure and determination of its risk against possible failure, based on the survey results of the current corrosion condition. Detailed inspection, on-site geometrical and corrosion measurements and partial loading tests were executed on the structure, which results served as input data of the probabilistic analysis. Advanced numerical models are developed to accurately calculate the load-bearing capacity of the heavily damaged structural details of the bridge by using stochastic analysis combining geometrical and material nonlinear analysis using imperfections (GMNIA). Based on the investigations, the necessary short-term and long-term maintenance tasks could be identified to be carried out on the bridge to ensure safe operation of the structure during the Sziget festival and to prolong the service lifetime of the bridge. © 2024 The Author(s).

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