Single-leaf vaults are acknowledged as particularly vulnerable to seismic actions: remark- able damages and collapses were surveyed on these elements after recent earthquakes, regardless of the earthquake intensity and of the level of the structure global damage. After a brief discussion on the seismic vulnerability of single-leaf vaults, a new strengthening technique for the reduction of the seis- mic vulnerability of single-leaf vaults is presented in this paper. Extrados lightweight plywood center- ings applying passive confinement are conceived to delay the onset of the vault failure mechanism. The reinforcement is designed as a 3-hinged arch, hinged constrained at the springing and at the vault key section to allow accommodating the small relative displacements of the vault springing, which may fol- low the deformation of possible internal ties or roof box structure. The extrados centring is a lightweight and dry solution, which does not require special man labour. The technique is reversible and minimally impairing of the structure integrity, thus respectful of the major restauration principles. The effectiveness of the solution is verified through an experimental study on the behaviour of a strengthened single-leaf vault subjected to cyclic distributed unsymmetrical loads. The efficiency of the strengthening is assessed through comparison with the seismic response of a reference unreinforced single leaf vault, tested in a previous research study.

(2016). Plywood extrados retaining structures for the retrofit of single-leaf vaults . Retrieved from http://hdl.handle.net/10446/79329

Plywood extrados retaining structures for the retrofit of single-leaf vaults

Marini, A.;Belleri, A.;Ferrario, L.
2016-01-01

Abstract

Single-leaf vaults are acknowledged as particularly vulnerable to seismic actions: remark- able damages and collapses were surveyed on these elements after recent earthquakes, regardless of the earthquake intensity and of the level of the structure global damage. After a brief discussion on the seismic vulnerability of single-leaf vaults, a new strengthening technique for the reduction of the seis- mic vulnerability of single-leaf vaults is presented in this paper. Extrados lightweight plywood center- ings applying passive confinement are conceived to delay the onset of the vault failure mechanism. The reinforcement is designed as a 3-hinged arch, hinged constrained at the springing and at the vault key section to allow accommodating the small relative displacements of the vault springing, which may fol- low the deformation of possible internal ties or roof box structure. The extrados centring is a lightweight and dry solution, which does not require special man labour. The technique is reversible and minimally impairing of the structure integrity, thus respectful of the major restauration principles. The effectiveness of the solution is verified through an experimental study on the behaviour of a strengthened single-leaf vault subjected to cyclic distributed unsymmetrical loads. The efficiency of the strengthening is assessed through comparison with the seismic response of a reference unreinforced single leaf vault, tested in a previous research study.
2016
Marini, Alessandra; Giuriani, E.; Belleri, Andrea; Preti, M.; Ferrario, Luca
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