Positive result for the static testing of the new Genova San Giorgio bridge. This was announced by Anas, who after analyzing the results of the load tests carried out on the structure, issued the test certificate. In August 2019 Anas was commissioned by the extraordinary commissioner for reconstruction, Marco Bucci, to deal with both the static and technical-administrative testing of the new Genoa bridge.
The static testing operations were entrusted to Anas who fielded a team of his technicians led by the engineer Achille Devitofranceschi. In the performance of his duties, Devitofranceschi was supported by a team of 20 Anas engineers and, with particular reference to the metal deck, by the accredited Anas Inspection Body. The static testing provided, in an initial phase, also the quality control of the materials used, the certification of their suitability and above all, as stated in the note by Anas, the appropriate checks of correspondence with what is foreseen in the executive project.
For the verification of the static calculations, the static tester made use of the technicians of the Design Coordination of the General Management of Anas. Once these checks were completed, the load tests began on 19 July. The tests, which lasted three days, aimed to experimentally verify the structural capacity of the bridge and its response to the actions impressed.
These were dynamic and static tests. The dynamic tests were performed by recording the dynamic parameters of the bridge and comparing them with those foreseen by the project, stressing the bridge both through natural forcing, such as the wind, and through braking tests.
In particular with regard to the braking test, eight articulated lorries crossed the bridge at 50 km per hour, simultaneously braking abruptly at the central span, in order to test the bridge’s ability to withstand significant horizontal actions. 56 static trucks were used for the static tests and “4 special trucks” for the tests on the slip ramp with the A7 motorway. In this phase, the response of the viaduct was measured through multiple systems: from topographic leveling to voltage meters inside the slab in the tense area, straddling the pile, to verify the cracking of the concrete; from the elongation meters to check if there were unwanted traction on the support devices up to the installation of a radar under the test spans to quickly check the deformations of the viaduct during the testing tests.
The technical-administrative testing, coordinated by the engineer Nicola Prisco, on the other hand, has the purpose of ascertaining the fulfillment of the contractual agreements and the interdisciplinary examination of the work to be carried out. Having acknowledged the positive outcome of the static test, the commission composed of three Anas technicians will issue the technical-administrative test certificate in the next few hours.
Finally, Anas is also in charge of verifying the viability of the bridge, preparatory for opening to traffic. The operations relating to the latter and decisive step are coordinated by the engineer Marcello De Marco, head of the Anas experimental center in Cesano. Once the declarations of conformity have been obtained and the two tests, static and technical-administrative, have been checked for practicability, they will be released in the coming days in view of the opening to traffic.