After natural disaster, damaged buildings need emergency reinforcements to recover to a stable structural condition. Since emergency reinforcements are components whose tension/compression is affected by the evolution of the static equilibrium of the supported structures, they can be instrumented to perform quasi-static structural monitoring. Fibre optic sensors based on the Bragg grating technology are well suited to instrument emergency reinforcement, as they allow easy installation, simple in-series cabling, and reliable long-term discontinuous monitoring with no unpredictable bias drifting in between successive monitoring campaigns. In this paper, we present an application on the early emergency reinforcements of the church Santa Maria delle Grazie in Colleposta, a small renaissance church damaged after the earthquake which interested central Italy in August 2016. As an emergency reinforcement, the church perimeter walls were confined by external wrapping. Sensors acting as strain gauges in temperature compensation regime were prepared custom, ready for installation on wrapping cables and along a vertical section of the wall. Results from monitoring campaigns in a 5-month time-span, seismic settling-down activity still being present, are presented, showing the easy installation and the effectiveness of the proposed procedure to monitor the working condition of the temporary emergency reinforcements.
|Titolo:||Use of fibre optic sensors for structural monitoring of temporary emergency reinforcements of the church S. Maria delle Grazie in Accumoli|
|Data di pubblicazione:||2019|
|Appare nelle tipologie:||1.1 Articolo in rivista|