Nonlinear seismic analysis of masonry bridges under multiple geometric and material considerations: Application to an existing seven-span arch bridge

Resilient infrastructure is nowadays attracting attention when designing new infrastructure projects. However, many countries around the world still have a large stock of existing transport infrastructure, such as railways and roads. In particular, masonry bridges are significantly widespread in Europe. These bridges, built a long time ago could suffer structural damage due to earthquakes, as their design in the past did not take this into account. The issue becomes critical because the scientific world still lacks cutting-edge monitoring techniques and calculation tools to accurately assess the integrity of existing bridges. These steps are fundamental before any maintenance activities are developed by infrastructure managers. In this study, the seismic behaviour of a seven-span masonry arch bridge is intensively investigated in order to provide new insights into the seismic vulnerability analysis of existing masonry bridges. In particular, parametric analyses are carried out to assess the effect of haunching, fill, and pier cross-section types on the seismic capacity of multi-span masonry bridges. Interesting observations were made on the change in ductility, capacity, and stiffness of the structure when the studied parameters are modified.