Loads
Static Loads
The loads considered in the analysis are described in the following:
- dead load on the on the sides of the station equal to 50 kN/m2 due to the presence of existing buildings and streets;
- dead load in correspondence to the station equal to 20 kN/m2 due to the presence of the streets;
- self-weight of the structure and the soil.
The structural condition of the metro station under the considered static loads are determined by performing a construction stage analysis, taking into account all the main phases involved in the construction of the station and in order to reproduce the excavation and the realization of the structure with cut and cover method, before the dynamic stage of the analysis. The principal construction phases are
- the realization of an excavation, characterized by a provisional slope 1H:5V, in order to create a first entrance ramp;
- the realization of the diaphragm walls and of the wells for the realization of the foundation piles;
- the realization of the top cover slab made from reinforced concrete and 1.2 m thick;
- the execution of a second excavation;
- the realization of the intermediate slab made from reinforced concrete and 0.6 (section 2-2) - 0.9 m (section 4-4) thick;
- the execution of a third excavation;
- the realization of the concrete bottom slab 0.25 m thick;
- the road surface restoration.