On the 22th of May 2013, during several release tests, in order to acquire the dynamic response of a base-isolated structure, and their soil-structure interaction, several accelerometers have been installed within the structure and on the surrounding soil. The building is located in Augusta City (Italy) an earthquake-prone area. The dynamic behaviour of the structure, together with the soil, has been monitored and analysed. In fact, it is well know the capability of a fixed-base structure to modify the motion of the surrounding soil during an earthquake or a release test, but there is very little information about this kind of soil-structure effects for base-isolated structures. During this experimental campaign the dynamic behaviour of two surrounding structures has been monitored before, during and after each test. The base-isolated structure has been characterized in terms of eigenfrequencies, equivalent viscous damping factor and mode shapes in ambient noise (considering the superstructure as a fixed-base structure) and during release tests (monitoring the dynamic behaviour of superstructure, base isolation system and underground floor).

Release tests have been carried out in collaboration with University of Catania (Prof. Giuseppe Oliveto).

Photographic Report:

   

 

   

 

  

          

Release Test: Movie

 

Pubblicazioni Scientifiche:

Ponzo F.C., Ditommaso R., Nigro D., Romaniello R. (2014). Analisys of Dynamic Behaviour of a Base Isolated Building: a Release Test in Augusta (SI), Italy. In: Second European Conference on Earthquake Engineering and Seismology, Istanbul, August, 25-29.

Athanasiou A., Oliveto G., Ponzo F.C. (2017). Baseline correction of digital accelerograms from field testing of a seismically isolated building. Earthquake Spectra. Doi http://doi.org/10.1193/022817EQS040M

Athanasiou A., Oliveto N. D., Ponzo F.C. (2020). Identification of first and second order models for the superstructure of base-isolated buildings using free vibration tests: A case study. SOIL DYNAMICS AND EARTHQUAKE ENGINEERING, vol. 135, ISSN: 0267-7261, doi: 10.1016/j.soildyn.2020.106178.