Traditional and Innovative Techniques for the Seismic Strengthening of Barrel Vaulted Structures Subjected to Rocking of the Abutments

In this paper, the main results of an experimental, theoretical and numerical study on the rocking behaviour of full scale barrel vaulted structures undergoing cyclic horizontal loading is discussed. The main scope of the paper is to provide some evidence of the rocking mechanism experienced by these structures when subjected to horizontal forces. The comprehension of the behaviour of such structural systems is fundamental for their seismic vulnerability assessment, as well as for the design of any possible strengthening technique. Different strengthening solutions are presented and compared: traditional techniques, such as extrados thin concrete slab, or masonry spandrel wall; and an innovative solution with an extrados thin lime slab reinforced by means of glass fiber mesh. The experimental results are used to validate both numeric and analytical models for the prediction of the structural response of masonry vaulted structures subjected to rocking of the abutments, as well as for the proportioning of the strengthening solutions.