Banca de DEFESA: Sabrina Lima Fechine Vitorino

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Sabrina Lima Fechine Vitorino
DATE: 21/06/2024
TIME: 14:30
LOCAL: Remoto, via plataforma Teams
TITLE:

Dynamic behavior analysis in the masonry dome of the Cathedral of Santa Maria del Fiore

KEY WORDS:

Dome, Masonry, Finite elements, Non-Linear Analysis, Earthquakes, Dynamic Analysis

PAGES: 100
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Estruturas
SPECIALTY: Mecânica das Estruturas
SUMMARY:

In 1296, under the design of one of the greatest architects of the time, Arnolfo di Cambio, construction began on the Cathedral Santa Maria del Fiore, which for many years was the largest church in Christianity. Built 55.00 meters above the ground, with an internal height of 32.00 m and an internal diameter of 45.40 meters erected on an octagonal plane, the Cathedral Dome is the largest ever built without the use of reinforcement. Weighing around 29,000 tons, the Dome of Santa Maria del Fiore is considered one of the greatest feats of engineering. The city of Florence is located between two seismic activity zones: Mugello, to the North, and Chianti, to the South. In May 2022, the city was hit by some earthquakes with a magnitude of up to 3.7Mw, same magnitude as events that occurred in June 2023. In September of the same year, seismic shocks with a maximum magnitude of 4.90 Mw were recorded and, in February 2024, seismic events of magnitude 3.5 Mw. To allow the perpetuation of historical constructions over the years, it is essential to analyze and predict the behavior of these structures, also including seismic action. Therefore, the present work aims to develop a non-linear numerical analysis of the seismic behavior of the Cathedral of Santa Maria del Fiore, using the finite element method evaluated in the ABAQUS computer program environment. The seismic analysis was developed with the help of the database made available by the SCALCONA 3.0 software from seven natural accelerograms, for five return times (50, 75, 101, 201, 475 years), of seismic events recorded in rocky outcrops that satisfy spectrum compatibility requirements with the regulatory response spectrum for any location within the Tuscany region. This analysis consisted of detailing accelerations, tensions and deformations resulting from the application of seismic events in the Cathedral's structure, as well as indicating the fault zones in the structure. The greatest stresses, accelerations and deformations were observed for the seismic event with a magnitude of 6.93 Mw, a distance from the epicenter of 83.53 km and a return time of 475 years. The static stress state varied from +1.80 MPa and -4.50 MPa to +2.31MPa and -8.50 MPa with the application of the event, with the highest acceleration of 40.84 m/s² and maximum horizontal deformation of 13.85 mm of the structure at the top of the vertical fissure on the southwest surface of the Dome. Therefore, a methodology for analyzing historic buildings subject to earthquakes was proposed through the construction of a numerical model calibrated based on experimental records of vibration modes and frequencies. The option to develop a model adjusted based on dynamic properties guarantees greater suitability since these parameters are much more sensitive to small and complex variations than static parameters, being specific and unique for each existing structure.

COMMITTEE MEMBERS:
Presidente - 1225412 - GRACIELA NORA DOZ DE CARVALHO
Interno - ***.843.298-** - JOSE LUIS VITAL DE BRITO - UnB
Interno - 1550512 - RODRIGO DE MELO LAMEIRAS
Externa à Instituição - MARILIA MARCY CABRAL DE ARAUJO - UFCG