Matriz DOFA

RESEARCH GROUP: Pier Paolo Diotallevi, Giada Gasparini, Luca Landi, Stefano Silvestri, Tomaso Trombetti KEYWORDS: base seismic isolation, HDRB isolator, application to existing buildings

The use of innovative techniques as the insertion of isolators at the base seems to be a promising solution both for the control of seismic effects in new buildings and for the retrofit of existing buildings. For the latter case the objective of sat- isfying seismic requirements of new structures is often significantly onerous and prohibitive. This occurs especially in case of strategic buildings. The introduction of isolators at the base, as it is known, allows to reduce the accelerations in the structure by an increase of the fundamental period of the isolated structure and a concentration of seismic demand at the level of the isolators. The research works on seismic isolation have regarded in gener- al the different typologies of isolation devices, the modeling of the devices, the design criteria and the applicative problems.

A group of studies have been aimed to evaluate the effectiveness of seismic retrofit through inser- tion of high damping rubber bearings at the base. Once the isolation system has been designed, the response of the structure has been analyzed con- sidering a 3D model characterized by variable pa- rameters for the isolators and non-linear behaviour for the superstructure. In particular the effects on near-field earthquakes on the response of base-iso- lated buildings has been investigated and the pos- sibility of using viscous dampers at the base to re- duce these effects on isolators has been examined. These studies have been repeated also with refer- ence of new buildings.

The research group has also completed the study of few first applications of PBSD approaches for the seismic retrofits, using base isolators, of exist- ing masonry structures, such as the ex-barracks Zucchi in Reggio Emilia within the bounds of the research project founded by the Italian Ministry of Research titled “Seismic protection of new and existing buildings” (1997), and the Teatro Galli in Rimini within the bounds of the research project founded by the Italian Ministry of Research titled “Seismic retrofit of monumental buildings with seismic isolation and innovative materials” (2000). Total number of publications: 15.

Fig. 1. Rubber Bearing isolator.

Fig. 2. FEM model of the ex-barracks Zucchi in Reggio Emilia.

MAIN PUBLICATIONS

Trombetti T., Ceccoli C., Polazzi D., Gasparini G., Silvestri S., “Sistemi di Isolamento Sismico per Edifici in Muratura secondo il Performance Based Design”, Memoria n. 390, Atti ANIDIS 2007, Pisa, 10-14 June 2007.

P.P. Diotallevi, L. Landi, S. Benni. (2006). “Ef- fect of near-fault ground motions on the re- sponse of base-isolated structures”, Proceedings of the 100th Anniversary Earthquake Conference Commemorating the 1906 San Francisco Earth- quake, San Francisco, California, April 2006. P.P. Diotallevi, L. Landi, S. Benni. (2006). “Seis- mic isolation of RC structures subjected to near- fault ground motions”, Proceedings of the 1st Eu- ropean Conference on Earthquake Engineering and Seismology, Ginevra, Settembre 2006. Ceccoli C., Trombetti T., Polazzi D., Bergon- zoni S., Silvestri S., Gasparini G., Monachesi A., “L’Isolamento Sismico del Teatro Galli di Rimini secondo la Metodologia del Perfor- mance Based Design. Parte I: Analisi del com- portamento dinamico della struttura”, Convegno Conclusivo del Programma di Ricerca di Interesse Nazionale - COFIN 2000 dal titolo: “Adegua- mento sismico di edifici monumentali tramite isolamento sismico e materiali innovativi”, co- ordinatore nazionale: Prof. Antonello De Luca (Università di Napoli Federico II), Napoli, 28 Febraury - 1 March 2003.

Ceccoli C., Trombetti T., Polazzi D., Bergon- zoni S., Silvestri S., Gasparini G., Monachesi A., “L’isolamento sismico del Teatro Galli di Ri- mini secondo la metodologia del Performance Based Design. Parte II: Risultati significativi”, Convegno Conclusivo del Programma di Ricerca di Interesse Nazionale - COFIN 2000, Napoli, 28 February-1 March 2003.

P.P. Diotallevi, L. Landi, S. Benni. (2002). “Adeguamento sismico di una struttura in c.a. esistente mediante isolamento alla base: proget- tazione, modellazione ed analisi”, Atti del 14° Convegno CTE, Mantova, 7-9 Novembre 2002. Trombetti T., Ceccoli C., Silvestri S., “A Simplified

Approach to the Analysis of Torsional Problems in Seismic Base Isolated Structures”, 1st Int.al Struc- tural Engineering and Construction Conference (ISEC-01), Honolulu, Hawaii, January 2001. Ceccoli C., Diotallevi P. P., Trombetti T., Mazzot- ti C. Cosentino N., Savoia M., Tullini N. “Studio dell’isolamento di un edificio monumentale ital- iano: la ex Caserma Zucchi a Reggio Emilia”. Atti ANIDIS 1999, Torino, Italy, September 1999. Trombetti T. Ceccoli C., Sandrolini, F. Big- nozzi M.C., Bravi B. “Ottimizzazione dello smorzamento nei sistemi di isolamento sismico alla base”. Atti ANIDIS 1999, Torino, Italy, Sep- tember 1999.

Ceccoli C., Cosentino N., Trombetti T. “L’isola- mento degli edifici monumentali in presenza di sismi epicentrali” Atti ANIDIS 1999, Torino, Italy, September 1999.

Ceccoli C., Trombetti T., Cosentino N. “Effi- cienza degli isolatori sismici HRDB per strut- ture in c.a. in presenza di sismi epicentrali”. 441 – 452. Atti del 12 Congresso CTE, Padova No- vembre 1998.

RESEARCH PROJECTS

2000-2002: Progetto di Ricerca di Interesse Na- zionale 2000 (PRIN 2000, ex 40%): “Adegua- mento sismico di edifici monumentali tramite isolamento sismico e materiali innovativi”; Co- ordinatore Scientifico: Prof. A. De Luca, Uni- versità “Federico II” di Napoli; Responsabile Scientifico Unità di Bologna: Prof. C. Ceccoli. 1997-1999: Progetto di Ricerca di Interesse Nazionale 1997 (PRIN 1997, ex 40%): “Pro- tezione Sismica dell’edilizia esistente e di nuova edificazione”; Coordinatore Scientifico: Prof. A. De Luca, Università “Federico II” di Napo- li; Responsabile Scientifico Unità di Bologna: Prof. C. Ceccoli; sottoprogetto: “Tecniche op- erative e metodi di analisi per l’isolamento sism- ico di edifici con l’impiego di HRDB”.

CONTACTS

[email protected] [email protected]

OPTIMAL INSERTION OF VISCOUS DAMPERS INTO STRUCTURES FOR THE