Ciocci, Maria Pia1; Sharma, Satyadhrik2 and Lourenço, Paulo B.3
1 PhD Student, ISISE, Department of Civil Engineering, University of Minho, Campus de Azurém, Guimarães, Portugal, mariapiaciocci@gmail.com
2 PhD Student, ROSE Programme, UME School, Istituto Universitario di Studi Superiori (IUSS), Pavia, Italy, satyadhrik.sharma@iusspavia.it
3 Full Professor, ISISE, Department of Civil Engineering, University of Minho, Campus de Azurém, Guimarães, Portugal, pbl.@civil.uminho.pt
ABSTRACT
The Cathedral of Ica, Peru, is an 18th century church that was heavily damaged by the earthquakes experienced in 2007 and 2009. Considered representative of religious buildings built in coastal cities of Peru, Ica Cathedral was selected as one of the prototype buildings in the Seismic Retrofitting Project, a collaborative project between the Getty Conservation Institute, the
University of Minho, the Pontifical Catholic University of Peru and the Ministry of Culture of Peru. The Cathedral is characterized by two sub-structures: an external masonry envelope made of rubble stone, brick and adobe masonries, and an internal timber framing system constructed by applying the quincha technique. This paper deals with the safety assessment of the Cathedral in its current condition and the proposal of effective strengthening to reduce its vulnerabilities. Nonlinear behavior is assumed for the different types of masonry by using the Total Rotating
Strain Crack model, while isotropic homogeneous and linear behavior is adopted for timber with adequate considerations for the connections. Advanced structural analysis is first carried out on the two sub–structures, independently. Afterward, several analyses including nonlinear static and nonlinear dynamic loading analyses are performed on the FE model of the entire structure of Ica Cathedral in order to: (1) validate the numerical model; (2) investigate the interaction of the two sub-structures; (3) evaluate the lateral load–carrying capacity and (4) identify the main failure mechanisms. Thereafter, a global strengthening of the structure is proposed guaranteeing the principles of minimum intervention and reversibility. Finally, the FE model including the strengthening is studied in order to test the efficiency of the strengthening proposal.
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