Consolidation of the apse of the Church of San Vito
Parrocchia di S. Bartolomeo Apostolo
Studio A.R.C. "Architettura Restauro Conservazione"
Studio ARC "Architettura Restauro Conservazione"
N.TE S.a.s. - Nunzio Sciammacca
Structural interventions with resins tissues and pultruded
A massive earthquake in 2000 hit Alessandria area and in 2002 the Church of San Vito in Morsasco, was consolidated and seismically reinforced with composite materials. The project, aimed at making accessible and statically secure the building, has been entrusted to the Technical Studio ARC of Acqui Terme.
The Romanesque Church of San Vito, dating back to the early medieval period, is a small building with a single nave plan, a porch and vaulted semicircular apse on which there are frescoes dating from the fifteenth century.
Its exact date is uncertain, however, according to the Studio ARC, the building site and the masonry texture of the walls, the church over the centuries has suffered more than a transformation. The original idea was in fact made of a small structure made with concrete rectangular sandstone while the extension of the side walls was made before 1585. At the beginning of the eighteenth century was later built the porch, with a ribbed vault in bricks arranged in a sheet, fifty years later the bell tower and the roof of the classroom were built.
The small church was left over time in a state of neglect and decay, as to be classified by the competent authorities, after the 2000 earthquake, as occasional use building, non-habitable and in poor state of maintenance. An immediate intervention of consolidation and securing were necessary.
After the seismic event the church was subjected to diagnostic tests by the research team, made at the time by young architects such as the Arch. Antonella Barbara Caldini and Arch. Finocchiaro from the Studio A.R.C. Through scientific instrumentation made available by the departments of the Faculty of Architecture, Engineering and Industrial Chemistry, University of Genoa, dynamic tests were carried out on the tie rods, sonic tests on masonry, endoscopic examinations and relative humidity monitoring.
Surveys have found, among other damages, cracks along the meridians of the apse and the hemicycle of the apse wall. The next project of consolidation and seismic improvement then allowed to intervene in the affected apse by means of:
Remove the old roof and clean the ceiling, plaster the intrados cracks and then shoring the structures. It was subsequently carried out the cleaning of the extrados with the total elimination of inconsistent parts and any other materials that could affect the good adhesion of the above mentioned processes.
Once removed the dust from the entire surface, the consolidating bicomponent synthetic resin Kimicover FIX was laied. After that, the two-component thixotropic epoxy adhesive Kimitech EP-TX was laid using a spatula, to level the surface to be reinforced and create an adhesive layer to immediately lay the the reinforcement.
The reinforcement of the apse was executed by the application of carbon fiber reinforcement bands Kimitech CB 320, put forth a roller and then impregnated with fresh two-component epoxy resin Kimitech EP-IN, applied by brush. This process was performed by arranging the carbon fiber strips and overlapping them in a double layer, to follow the curved profile of the vault. Two more reinforcing bands orthogonally to the previous one were added, as a transverse reinforcement or stirrup.