Three-dimensional numerical modelling of concrete framed structures affected by tunnelling-induced settlements

The construction of tunnels in urban areas inevitably affects existing structures. This paper focuses on the interaction between mechanised tunnelling and reinforced concrete framed buildings founded on strip footings, which constitute a great part of the built environment worldwide. The study aims at modelling the foundations and the structural members of the building with a high level of detail, so as to realistically estimate the response of the soil-structure system to tunnelling-induced displacements. In particular, special attention is devoted to the role of infills, which strongly influence the global structural stiffness. The research is carried out by performing three-dimensional parametric finite element analyses of the problem at hand, adopting the geotechnical conditions and the tunnel characteristics of the Milan metro-line 5.