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TRUSS SUPPORT

Wooden structures are largely used both in new construction and restorations.

Wood is a material with a long tradiction in constructions, and historic centres are full of example that testify it’s usage in every age, but it has a modern side to it because of its performance/weight ratio that makes building faster and makes industrializable the construction business.

Particularly in restoration works has in time become more appealing the usage of synthetic fiber (carbon) also known as fibre-reinforced plastic (FRP) for wooden truss support.

The structural adjustment interventions that call for the usage of carbon fibers have two main purposes:

  • Decrease the extent of deflection on inflexed slabs.
  • Recover/enhance the traction resistance of truss chains.

Their usage shows major advantages compared to restoration techniques that call for the usage of foil and/or iron bars:

  • the supporting action on the structure happens without a weight increase (contrary to what happens with irons supports);
  • a carbon band is light, doesn’t encumber and is easy to carry even on a scaffolding;
  • we obtain a more efficient support with less manpower;
  • the carbon support isn’t subjected to decay and doesn’t lead to moisture.

The cement that usually make up the matrix  of the frp is crucial for the efficacy of the support intervention.

The epoxide resins are especially suitable for the glueing and soaking of carbon fibers because:

 

  • they display a shrinking effect lower than 0,1% during the hardening phase;
  • they are less sensitive to moisture;
  • they have a natural structural cohesion to wood;
  • they show an optimal soaking of the fibers.

1° INTERVENTION EXAMPLE

Location: Misericordia Museum – Anghiari  (hystoric centre)

 

Structural reinforcement with load increase on a wooden ceiling with carbon fiber foils and epoxide resins.

Mounting system on the exposed face of the truss.

Preparation of the location with planing, coating of resins and application of the foil.

Removal of resins exceeds, recleaning and color adjustments.

This system allows a reinforcement and a load increase on the truss with a noteworthy (50%) saving on materials (a single central foil instead of one on each side).

The foil remains visible, so this technique is more suitable for truss of false ceiling and or rustic and less visible truss (cellars, attics, etc.).

2° INTERVENTION EXAMPLE

Location: private space designated as a dining hall

 

Load increase on wooden ceiling with carbon fiber foils and epoxide resins.

Mounting systemwith longitudinal cut  following, where there is, the truss bending.

Preparation of the location withhardening and firming, application resins and insertion of the foil.

Removal of resins exceeds, recleaning and color adjustments.

This system allows a reinforcement and a load increase on the truss without jeopardizing its natural appearance and historical accuracy.

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