Seismic retrofitting of Capodichino viaduct
Multidisciplinar approach for retrofitting a highway viaduct.
The service refers to both the executive and construction design phases for the static recovery of the Capodichino Viaduct in Naples territory. The service focused on structural works adaptation to the Ministerial Decree – DM2008 – standards through the modification of the constraint scheme, this implemented through viscous dumpers installed to keep the original constraint scheme unchanged in operation and dissipating energy during the seismic event, thus limiting displacements and stresses on substructures. Nodal infrastructure within the beltway crossing Naples to connect the city center to the suburban developments and connecting the SS7 public road near Arco Felice-Pozzuoli (west) to the A1 toll highway (east), the Capodichino Viaduct designed by ing. Silvano Zorzi is made up of two interconnected decks in a mixed structure, one per each roadway, with a total length of 1360 m and a width of 14.0 m; on both sides the roadway has a net width of 11.4 m. Each deck, continuous over 18 spans with spans varying from 52 to 92m, is separated by 4 joints made with pairs of connecting rods, which while allowing independent longitudinal displacements, guarantee flexural and shear continuity. The reinforced concrete piers have a hollow circular section with a base diameter varying between 2.65 and 3.30m and are vertically prestressed. The height of the piers varies from 7.90 m to 38.80 m. The foundation works are long in wells or on variable piles. ► Geometric and structural characterization in order to reach the degree of knowledge LC3. ► Evaluation of material tests – destructive and non-destructive tests performed over time. ►Evaluation of geognostic and geophysical tests performed over time and evaluation of the main resonance frequencies of the soil by measuring the HVSR. ►Safety assessment according to NTC2008. ►Multi-criteria evaluation for the choice of isolators / dissipators for the purpose of seismic adaptation with research analysis. ►FEM time history elastoplastic analysis. ►Control of the seismic effects of microzonation. ►Procedures for testing devices and reassessment of seismic behavior. ►Reduction of costs and execution times.m. The foundation works are long in wells or on variable piles. ► Geometric and structural characterization in order to reach the degree of knowledge LC3. ► Evaluation of material tests – destructive and non-destructive tests performed over time. ►Evaluation of geognostic and geophysical tests performed over time and evaluation of the main resonance frequencies of the soil by measuring the HVSR. ►Safety assessment according to NTC2008. ►Multi-criteria evaluation for the choice of isolators / dissipators for the purpose of seismic adaptation with research analysis. ►FEM time history elastoplastic analysis. ►Control of the seismic effects of microzonation. ►Procedures for testing devices and reassessment of seismic behavior. ►Reduction of costs and execution times.