“increasing the level of safety in case of seismic actions”

Framework Contract RFI 188/2019  – Bridge inspection and maintenance

Location

Italia

Period

2018 – in corso (fino al 2024)

Amount of service

200.000 €  (al 2019)

Client

RFI S.p.A

Services provided

Global and local seismic vulnerability checks of the existing state (non-linear analyses, brick-type finite element models);

Verification of structures for static railway loads;

Structural calculation reports (structural analyses and verifications);

Design of global and local structural improvements using innovative thixotropic/cementitious steel fibre material.

Description

At the end of 2019, the assignment concerned the completion of the verifications and designs of 52 bridges and viaducts, of use classes III and IV, with various types of deck and materials used.

The activities carried out included: analysis and possible integration of available investigations, global and local seismic vulnerability verifications of the actual state in accordance with the regulations in force (non-linear analyses using brick-type finite element models), detailed verification of the sub- and super-structures for static railway operating loads, and design of structural improvement works.

The main structural types analysed include:

  • Single and multi-span arch bridges in reinforced or unreinforced concrete.
    (Global and local analyses, verifications and local reinforcement on piers).
  • Single and multi-span masonry arch bridges.
    (Global and local analyses, verifications and local reinforcement on piers).
  • Isostatic or continuous pre-stressed or post-stressed concrete viaducts on single or multi-column reinforced concrete piers.
    (Global analyses, verifications and global reinforcements: piers and foundations)

The scope of works is to increase the level of safety of the infrastructures in case of seismic actions and ensure that the level of safety achieved is maintained over time, through a design analysis of restoration of the existing state of damage and evaluation of structural interventions in the project.

To verify the seismic vulnerability of the bridges, three-dimensional finite element calculation models are used for seismic analysis in both longitudinal (along X) and transverse (along Y) directions. The models realised schematize all the structural elements of the bridge that participate in the seismic resistance of the bridge (arches, piers, reinforcement). The model calculates the masses and applies the loads to the structure. The finite elements used to discretize the structural elements are of the first-order three-dimensional solid Hexahedron (Brick) type.

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