ROMA – Italy is a rustic with excessive “seismicity” and with an equally excessive slowness within the reconstruction of earthquake disasters. Roughly severe slowness that has affected governments of each political shade. However that in any case in our nation there was the unusual perspective of abandoning for a very long time the populations hit by earthquakes earlier than the reconstruction, is written in Historical past.
Italy’s geographical place performs an vital position. There are areas the place earthquakes happen incessantly however are of low vitality, equivalent to within the Alban Hills, south of Rome, or within the Vesuvian space, or within the Etna space. Then there are different areas the place earthquakes happen extra hardly ever however are of excessive vitality, equivalent to within the Apennines, for instance. The seismicity of our Peninsula has to do with its specific geographical place, positioned within the convergence zone between the African and Eurasian plates, subjected to sturdy compressive thrusts, which trigger the overlapping of rock blocks. The Italian territory extends over a number of tectonic plates, whose reciprocal motion periodically generates earthquakes. For that reason, our nation is at excessive seismic threat.
Areas with the very best seismic threat. They’re: Zone 1 (excessive threat): Friuli Venezia Giulia, Veneto, Abruzzo, Umbria, Molise, Campania, Calabria, Sicily. Zone 2 (medium-high threat): Emilia Romagna, Lazio, Marche, Puglia and Basilicata. Zone 3 (medium-low threat): Lombardy, Tuscany, Liguria and Piedmont.
The ENEA mission. So ENEA has taken the lead in a mission, which isn’t coincidentally referred to as “RIPARA”, exactly to strengthen historic buildings with modern anti-seismic applied sciences “and superior sensor options with minimal visible impression”. Along with ENEA, the EdilCAM Sistemi firm and the Universities of Cassino and Southern Lazio, Sapienza and Roma Tre (the latter within the position of coordinator) participated, because of funding from the Lazio Area inside the Cultural Heritage Know-how District (DTC). The brand new applied sciences – validated on ENEA’s shaking tables – will make the buildings appropriate for resisting greater than twice the acceleration of the 2016 earthquake.
The stone taken from the rubble was used. Within the first section of the mission, researchers used stone components taken from the rubble of buildings that collapsed following the 2016 earthquake to copy typical partitions of historic buildings within the villages of central Italy, each when it comes to wall texture and mortar traits. The prototype wall, with out reinforcements, was then examined on the shaking tables of the ENEA Casaccia Analysis Middle, the place the identical shocks of the 2016 and 2017 Central Italy earthquakes have been reproduced.
The 2 modern options. The partitions have been subsequently repaired and bolstered with two modern options developed as a part of the mission: the primary concerned small keyholes built-in into the uncovered brickwork to make sure the proper “pull” and retention of the partitions; the second resolution as a substitute concerned the appliance of steel strips between the mortar and the stones, fully invisible from the skin. Each options have been built-in with the insertion of an modern monitoring system based mostly on fiber optic sensors, created and put in by ENEA and the College of Roma Tre, to observe the metal strips – and due to this fact the structural ‘well being’ of the constructing – and reduce the visible impression, whereas making certain reliability and sturdiness.
Simulations of violent earthquakes. The built-in system put in on the partitions was subjected to the identical violent accelerations of the earthquakes that hit our nation about 8 years in the past: whereas the wall with out reinforcements reached a stage of injury just like the Collapse Restrict State (SLC) for a peak acceleration worth on the base equal to 0.5 g, or half the acceleration of gravity, the bolstered one demonstrated a resistance capability double in comparison with the situation with out reinforcement.
The effectiveness of the outcomes. The evaluation of the outcomes obtained from the 2 configurations has highlighted the effectiveness of the brand new anti-seismic resolution, confirming that this may be the trail to take to strengthen the historic stone buildings of central Italy, combining the protection and conservation of historic stone homes.
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– 2024-07-13 13:03:57
