Strenghtening of mansonry arches and vaul

The strengthening of masonry arches and vaults is one of the most functional intervention in reinforcements with FRP. This reinforcement intervention can be carried out both in intradossal and extradossal zone, and in both cases it permits the deletion of the probable opening of hinge families either at the intrados or extrados, respectively. In this way, it is impossible the hypostatic condition of the reinforced structure, which can only change its condition of equilibrium from a hyperstatic condition to an isostatic one. In case of intradossal interventions, the reinforcement should be connected to the masonry with anchoring systems, such as FRP strands inserted in the walls and linked to the reinforcement. The positioning of the FRP bands on the vaults which have to be reinforced, depends on the vault geometry itself; in fact it changes a lot depending on whether it is a barrel-vault, a cross vault… The stability of a vaulted structure is guaranteed when the curve of pressures, that is the funicular polygon of the permanent and accidental Ioad burdening on it, passes into the centrai inertial core of each “static channel” section. Instead, if the pressure curve carne out from the above-mentioned static channel, as a result, for example, of changed Ioad conditions, the section wouid be reduced, causing consequent traction tensions. If the pressure curve, already external to the core lines, carne out even from the intradossal and extradossal lines, i.e. from the borders of the arch itself, the crisis caused by the formation of a hinge wouid occur. The presence of FRP prevents the formation of these hinges, and so s oollapse, too, by absorbing the present traction efforts.

Advantages

  • Facility in modeling materials
  • A larger durability of structure
  • Rapid intervention
  • No oxidation
  • No weight burden

 

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