Effective management of masonry arch bridges on the Isle of Wight, UK

The reliable assessment of masonry arch bridges is crucial for ensuring their structural integrity and safe operation. Traditional methods, such as the Military Engineering Experimental Establishment method, have been shown to have limitations in accurately predicting load-carrying capacity, particularly for short-span arches and multi-span structures. Case studies of a sample of masonry arch bridge assessments, representative of the bridge stock on the Isle of Wight, UK, are presented in this paper. The assessments were conducted over the last 10 years using advanced numerical modelling techniques. Software that utilises rigid block analysis and limit analysis theory was employed to provide a more reliable assessment of arch bridge behaviour and capacity. By carefully considering factors such as geometry, material properties, defects and multi-span behaviour, numerical modelling enabled the identification of critical failure mechanisms and the determination of accurate load capacities. This approach facilitates informed decision making regarding maintenance, repair and strengthening strategies, as appropriate. Such a rigorous and data-driven approach also allows engineers to effectively manage and preserve these historic structures while ensuring public safety and promoting sustainable infrastructure practices.