|Tipo di tesi||Tesi di laurea magistrale|
|Titolo||Metodi innovativi di riparazione e retrofit delle pile da ponte progettate secondo la normativa Cinese|
|Titolo in inglese||Innovative repairing and retrofitting techniques of bridge piers designed according to Chinese Code|
|Struttura||Dipartimento di Ingegneria "Enzo Ferrari"|
|Corso di studi||Ingegneria Civile (D.M.270/04)|
|Data inizio appello||2017-04-12|
|Disponibilità||Accessibile via web (tutti i file della tesi sono accessibili)|
Il collasso dei ponti in calcestruzzo armato in seguito a rilevanti eventi sismici è una fonte di pericolo per la sicurezza pubblica. Questo tipo di infrastrutture richiede una riparazione rapida per garantire una tempestiva riapertura del traffico ed evitare problemi nella logistica dei soccorsi alle zone colpite dal sisma. Per queste ragioni risulta di estrema importanza e di grande attualità lo studio di tecniche innovative di riparazione e retrofit che permettano la riapertura del ponte in tempi brevi.
The reinforced concrete bridge collapse after severe seismic events represents an hazard for the public safety. This kind of infrastructure need to be quickly repaired in order to guarantee a rapid reopening of the traffic lanes and to avoid logistic problems on the rescue actions in the zones impacted by the earthquake. For these reasons it is important to study innovative repair and retrofit techniques which allow the reopening of the bridge in a very short time. In the ‘90s, an experimental research work started in the RomaTre University. The purpose is to propose a rapid and effective repair technique for the circular r.c. bridge piers severely damaged after an earthquake. In 2013 a collaboration with the College of Civil Engineering of the Fuzhou University started, and since 2015 even the University of Modena and Reggio Emilia is part of the research group. During the Chinese experimental research campaign, some improvements of the techniques adopted in the previous work done in Rome were proposed, and tested on pier specimens scaled (1:6) with respect the original piers considered. Some problems were faced. This thesis focuses on deepen some of these problems and on the continuation of the research and the experimental activity; Furthermore, a possible extension of the research was studied. In detail, the main topics treated in this thesis are: • The problem of the welding connection between original bars in the pier and new turned bars which substitute the damaged ones removed by the pier • Compression and bending tests on the material Ultra High Performance Concrete reinforced with different contents of Italian polymeric fibers • Possible extension of the research: The Bouc-Wen model, to forecast the hysteretic behavior of the piers, calibrated starting from the experimental data obtained from piers tests.