New online Enea test on Obelisco Lateranense

Gerardo De Canio

Gerardo De Canio illustrating the tests at the Meeting.

During PERPETUATE plenary meeting, held in Bath on January 12-13 2012, some experimental tests have been performed at ENEA Casaccia Laboratory, in Rome, with a DIRECT ONLINE CONTACT with PERPETUATE staff.

This experiments have been possible thanks to ENEA virtual laboratory of Materials and Qualification of Components  which is known as “DySCo Virtual  Lab” (Structural Dynamic, numerical Simulation qualification tests and vibration Control).

To see more about DySCo Lab see the following links:
DySCo Lab http://www.afs.enea.it/project/dysco/index.php

The PERPETUATE experiment during the meeting in Bath,  involved  the construction of a 1:6 scaled mock-up of the Egyptians lateranense obelisk in Rome under the supervision of Dr. Gerardo De Canio, head of the Laboratory of qualification of materials, components and systems.
The model is  composed of three blocks to be tested by shaking table at ENEA Research Center by DySCo Virtual Lab.

PERPETUATE staff following online tests

PERPETUATE staff following online tests

Aim of the study is  to evaluate the effects of sliding and rocking of single or multiple blocks.
Four tests were executed over the period of 15 minutes:
2 “free vibration “ tests  (pull-release with an initial rotation of 1 degree)
2 shaking table tests:
-   1 Axial acceleration input
-    3 Axial acceleration input
The Seismic Input used for the shaking table tests takes into account the seismicity of the site  of San Giovanni in Laterano in Rome.

Here is the record of the tests:

Pull release test – h 12mm

Shaking table obelisk – x

Shaking table obelisk – xyz

and some videos on the ONLINE connection with Bath Meeting

Following the test

End of test

Data acquisition was performed by a new, innovative, high resolution 3-D optical movement detection and analysis system named “3DVision” which is able to track the dynamic displacement of the selected points (markers) of  mock-ups during the seismic tests. Twelve high resolution (up to 4MPixel) infrared Cameras are used to measure accurate 3-D positions of hundred of markers placed on the structure during the seismic tests. This technique allows measuring of 3 axial absolute displacements with easy and fast test set-up, high accuracy and the possibility to link the 3D-motion time histories of the tracked markers with CAD drawings of the structure and validate the FE models in real time during experimental data assimilation.
The measure of the displacements is a crucial task for the numerical and experimental studies in structural dynamics, especially within the displacement based approach in seismic design and calculations. At the ENEA laboratory all the experimental data are acquired by 3DVision system and the experimental campaigns are remotely shared in-live and saved for future use by DySCo Virtual lab.

Earlier small scale experiments by PERPETUATE see:

The obelisk

The obelisk

http://www.perpetuate.eu/shaking-table-tests-on-the-arch-by-dysco-virtual-lab-and-3dvision-acquisition-system/

Video showing shaking table tests of models of the Riace Bronzes at DySCo Lab
http://www.perpetuate.eu/enea-experimental-test-on-an-innovative-isolation-system-for-the-riace-bronzes/

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