The Finzi Associati studio specialises in the design of bridges, guiding the client throughout the planning process, from the feasibility study, moving to final design, execution, project management through to static testing and monitoring, and any modifications or repairs to the facility during its service life.
Our most significant work is the Bridge over the Straits of Messina, for which the studio produced the final project draft.
The bridge is suspended, with a central span of 3300 m, making it the longest bridge in the world.
The bridge is designed to withstand more violent seismic events than that of 1908, and winds of over 220 km/h, impossible in the Mediterranean.In particular, 3 levels of actions were set:
Level 1, Normal: actions with a return period of 50 years under which all structures must remain in the elastic range
Level 2, Exceptional: actions with a return period of 400 years under which the main structures must remain in the elastic field whilst accepting slight damage to the secondary structures (without collapse), provided that the repair does not prevent the operation of the work
Level 3, Extreme 3: actions with a return period of 2,000 years, under which damage to the work is accepted, provided there is no collapse and repairs are guaranteed
Project scenarios include:
-an air horn with a rotational speed of 265 km/h and a translation speed of 86 km/h,
-an earthquake with maximum ground acceleration of 0.58g,
-an impact from a 20-tonne airplane at 540 km/h
The suspendeddeck spans 3,660 m and houses 12 lanes and service lanes, as well as two railway tracks, giving a total width of 60 m.The deck consists of three independent steel boxes separated by grilles; aerodynamic stabilising profiles provide aeroelastic stability with wind speeds up to 270 km/h.
On each of the road lanes, the load is 9,960 tonnes, which corresponds to 120 heavy vehicles and 3,800 cars.The project rail load is 9,850 tones, which corresponds to 2 trains of 600 m length weighing 8.2 tonnes/m.Road and rail loads are considered concomitant.
The load-bearing cables have a length of 5,300 m; each one comprising 4 cables with a diameter of 1.24 m constituting 44,352 sprung steel wires.
The two towers are made of two lamellar legs with 16 m x 12 m cross-section in S420 steel.The height of the towers is 370 m (376 m above sea level); There are 4 intermediate links between the two legs.
The foundations of the towers pose no particular difficulty, except for the dimensions involved:86,400 cubic metres of concrete on the Calabria side and 72,400 cubic metres on the Sicily side.
The terminal structures need to anchor a force of 139,000 tonnes for each of the two pairs of bearing cables.Here too, the dimensions are relevant:237,000 cubic metres of concrete on the Calabria side and 328,000 cubic metres on the Sicily side
Other bridges on which structural projects have been carried out
The Finzi Associati studio has carried out seismic checks on existing viaducts and bridges, in particular:
The Finzi Associati Ingegneri Strutturali studio has carried out testing on numerous bridges on the high speed Milan-Napoli railway line: