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Effectiveness of HDRB isolation systems under low energy earthquakes
https://orcid.org/0000-0003-1430-6177
https://orcid.org/0000-0003-1433-3941
https://orcid.org/0000-0002-6031-4437
https://orcid.org/0000-0002-1013-2512
https://orcid.org/0000-0001-5591-9936
https://orcid.org/0000-0001-9279-9144
Abstract The experimental seismic behaviour of an isolation system, made of high damping rubber bearings, under low energy earthquakes is analysed. The seismically isolated building was instrumented by means of an accelerometer network. It was first characterized dynamically using also fifteen seismometers to record ambient vibrations. Then, all the events of the seismic sequence that struck Central Italy from August 2016 to January 2017 were recorded. These allowed evaluating the effects of earthquakes with different energy on the structure. Due to the long distances from the epicentres of these events, the analysis referred to the behaviour for very low shear strains in the rubber. The resonance frequencies of the base isolated building were much higher than those supposed in the design phase, but the filtering effect was still effective. One of the relative displacement history recorded during the strongest event was applied to the same devices used for the type tests at the construction time. The results obtained in terms of isolator stiffness were consistent with the experimental ones.
Highlights The good performance of the isolation system even under very low energy earthquakes. The effective filtering due to the isolation, even though the resonance frequency was higher than the design one. The variation of the isolator stiffness and damping for very low shear strains.
Effectiveness of HDRB isolation systems under low energy earthquakes
https://orcid.org/0000-0003-1430-6177
https://orcid.org/0000-0003-1433-3941
https://orcid.org/0000-0002-6031-4437
https://orcid.org/0000-0002-1013-2512
https://orcid.org/0000-0001-5591-9936
https://orcid.org/0000-0001-9279-9144
Abstract The experimental seismic behaviour of an isolation system, made of high damping rubber bearings, under low energy earthquakes is analysed. The seismically isolated building was instrumented by means of an accelerometer network. It was first characterized dynamically using also fifteen seismometers to record ambient vibrations. Then, all the events of the seismic sequence that struck Central Italy from August 2016 to January 2017 were recorded. These allowed evaluating the effects of earthquakes with different energy on the structure. Due to the long distances from the epicentres of these events, the analysis referred to the behaviour for very low shear strains in the rubber. The resonance frequencies of the base isolated building were much higher than those supposed in the design phase, but the filtering effect was still effective. One of the relative displacement history recorded during the strongest event was applied to the same devices used for the type tests at the construction time. The results obtained in terms of isolator stiffness were consistent with the experimental ones.
Highlights The good performance of the isolation system even under very low energy earthquakes. The effective filtering due to the isolation, even though the resonance frequency was higher than the design one. The variation of the isolator stiffness and damping for very low shear strains.
Effectiveness of HDRB isolation systems under low energy earthquakes
https://orcid.org/0000-0003-1430-6177
https://orcid.org/0000-0003-1433-3941
https://orcid.org/0000-0002-6031-4437
https://orcid.org/0000-0002-1013-2512
https://orcid.org/0000-0001-5591-9936
https://orcid.org/0000-0001-9279-9144
Abstract The experimental seismic behaviour of an isolation system, made of high damping rubber bearings, under low energy earthquakes is analysed. The seismically isolated building was instrumented by means of an accelerometer network. It was first characterized dynamically using also fifteen seismometers to record ambient vibrations. Then, all the events of the seismic sequence that struck Central Italy from August 2016 to January 2017 were recorded. These allowed evaluating the effects of earthquakes with different energy on the structure. Due to the long distances from the epicentres of these events, the analysis referred to the behaviour for very low shear strains in the rubber. The resonance frequencies of the base isolated building were much higher than those supposed in the design phase, but the filtering effect was still effective. One of the relative displacement history recorded during the strongest event was applied to the same devices used for the type tests at the construction time. The results obtained in terms of isolator stiffness were consistent with the experimental ones.
Highlights The good performance of the isolation system even under very low energy earthquakes. The effective filtering due to the isolation, even though the resonance frequency was higher than the design one. The variation of the isolator stiffness and damping for very low shear strains.
Effectiveness of HDRB isolation systems under low energy earthquakes
Clemente, Paolo (author) / Bongiovanni, Giovanni (author) / Buffarini, Giacomo (author) / Saitta, Fernando (author) / Castellano, Maria Gabriella (author) / Scafati, Federico (author)
Soil Dynamics and Earthquake Engineering ; 118 ; 207-220
2018-12-17
14 pages
Article (Journal)
Electronic Resource
English
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