TA project: SHARED

Click here to read the final report of the SHARED project.

Click here to watch a video from the tests conducted under SHARED.

Read more on the progress and test results of SHARED in the Joint brochure of the SERIES TA facilities.

TITLE OF PROPOSAL: Shaking table tests of Historic Architecture Retrofitted with Energy Dissipators

LNEC, Lisbon, Portugal

25 January 2010


END DATE: October 2012

NO. OF USERS (researchers): 10

Dina D’Ayala - University of Bath (UK)

Andrew Plummer - University of Bath (UK)
Sara Paganoni - University of Bath (UK)
Peter James - Cintec International Ltd (UK)
Dennis Lee - Cintec International Ltd (UK)
Siro Casolo - Politecnico of Milan (Italy)
Charalampos Alexakis - Alexakis-Alexakis (Greece)
Dimitrios Alexakis - Alexakis-Alexakis (Greece)
Paulo B. Lourenço - University of Minho (Portugal)
Rita Maria Diogo de Carvalho de Moura – BEL, Engenharia e Reabilitação de Estruturas, S.A. (Portugal) 


The testing session proposed within the SERIES programme is part of a wider ranging research activity carried out under the supervision of Dr. D. D’Ayala at the University of Bath, aimed to design and validate a dissipative device for the seismic protection of heritage buildings. The ultimate goal is the development of a novel retrofit system, optimised in respect to location and size of the devices to respond to the performance criteria of life safety, minimum intervention and limited damage.
The problem of out-of-plane mechanisms, which often affect historic buildings because of poor or deteriorated connections, is addressed relying on a performance-based design, i.e. control of displacements and reduction of accelerations and stress concentration.
Accordingly, the device is designed to be inserted at the joint between perpendicular walls, as part of longitudinal steel anchors grouted within the thickness of the walls: the metallic profiles improve the boxlike behaviour of the building, while the devices allow small relative displacements between orthogonal sets of walls and the dissipation of the seismic energy input in the structure; thus, problems such as localised damages are avoided.
The major benefit of the research consists in the fact that the device draws on a well-established technique as much as on innovative methods, leading to further progress in the field of the seismic protection of heritage buildings.
At the current stage of the research two alternative dissipative devices have been developed: one is based on the plastic deformation of stainless steel, the other relies on a friction mechanism. Both prototypes have been tested under pseudo-static and dynamic load cycles with the aim of reaching a target displacement, which is comparable with the allowable drifts prescribed by structural codes, and a desirable level of dissipated energy.
Computational modelling of prototypes is ongoing; the devices will be modelled as isolated elements, tuned on the basis of experimental data and finally inserted in a model of a structure to study the effect of their effect on seismic performance.
However, full-scale testing is crucial for the research inasmuch as it would allow for the validation of numerical models for the whole strengthening system and would provide experimental data for the development of the design procedure.

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