Regresar

Effects of FRP-strengthening on thrusts of arches and vaulted masonry structures

Abstract:

Masonry arches and vaults are in equilibrium when the thrust line is limited inside the thickness of the structural element. The horizontal thrusts generated at the base are supported by the lateral structures or by ties that are inserted as tendons. The thrust line may overcome the thickness of the element, due to seismic forces, settlements at the base, yielding or relaxation of the tendons; this occurrence may threat the global equilibrium of the vault or arch. Fiber Reinforced Polymer (FRP) materials may be used as strengthening elements when bonded at the intrados of the curved element, showing high effectiveness in terms of structural performance. One of the main effects is represented by the reduction of the horizontal thrusts that arise from the action of the vertical applied forces. This effect is also favorable against the seismic forces that arise during earthquakes. Based on a simple model, the paper shows the mechanical effects of the FRP-strengthening at the intrados of the curved masonry elements in terms of thrust reduction, the same advantage is shown for those masonry elements subjected to eccentric axial load.