SERA TA Project # 27

Title of Project:
“SISIFO” Seismic Impedance for Soil-structure Interaction From On-site tests
Hosting Research Infrastructure:

No. of Users:

Team Leader:
DICEA – University of Napoli Federico II
Francesco Silvestri

DICEA – University of Napoli Federico II
Anna d’Onofrio, Filomena de Silva, Annachiara Piro

Summary of Project:
Investigation on the soil-foundation-structure interaction (SFSI) through numerical interpretation of dynamic model and full-scale tests has been shown to be effective for improving the prediction of the seismic performance of buildings, especially those located on deformable soil.
Advances in the dynamic monitoring and signal processing techniques nowadays allow for characterizing the seismic behavior of the soil-structure systems, to be identified through the interpretation of dynamic motion recorded on-site under random noise or forced vibration.
In simplified dynamic SFS models, it is required to introduce the dynamic compliance of the foundation-soil system by frequency-dependent impedance functions. The proposal SISIFO aims at investigating the reliability of different procedures for back-calculating the impedance functions of shallow foundations from the on-site tests. Random, forced and free vibration tests will be performed on two different structural configurations (braced vs unbraced) on the full-scale experimental facility of EuroProteas. Acceleration and velocity on several significant points of the structure and in an extended volume of the interacting soil will be recorded and numerically processed to back-figure the impedance functions throughout a wide frequency range.
The reliability of the different testing procedures will be classified according to the coherence of the experimental impedance functions, which will be compared against those predicted by analytical solutions available in the literature.
The encouragement in the adoption of reliable SFSI simplified models will promote a more accurate assessment of the seismic safety of existing buildings and will reduce retrofitting interventions, saving money and limiting the impact on their original features. The latter aspect is particularly significant in the Mediterranean seismic countries such as Greece and Italy, to enhance the seismic resilience of their monuments and historical centers.