Issue 45

F. Brandão et alii, Frattura ed Integrità Strutturale, 45 (2018) 14-32; DOI: 10.3221/IGF-ESIS.45.02 23 the tensile stress was identified as 0.065 MPa. These values are less than load capacity of the clay brick masonry, here es- timated as 3.20 MPa (compressive strength) and 0.16 MPa (tensile strength). Seismic analysis To analyze the seismic behavior of the church, linear time-history analyses of the structure were performed. Due to the absence of natural records of Brazilian earthquakes, records of real earthquakes occurred in other countries were used. The church was subjected to two earthquakes of different magnitudes with time-length of 30 s each one. As Earthquake 1, obtained by [49], the three components of the accelerogram of the San Juan de los Llanos earthquake (Fig. 11) occurred on 06/15/2014, 36 km from Ometepec, Guerrero, Mexico, of magnitude 4.1 with peak ground acceleration of 0.048 g on the component N00W was used. This earthquake was selected because its peak ground acceleration is very close to the value of the soil acceleration of the Sobral city which, according to the seismic zoning of [20], is located in Zone 1 with a maxi- mum acceleration of 0.05 g . In addition, the magnitude of this earthquake is consistent with the seismic hazard of Sobral city, because the biggest earthquake recorded in this region had a magnitude of 4.2 m b . Figure 11 : Accelerograms of the Earthquake 1- San Juan de los Llanos . As Earthquake 2, the three components of the El Centro earthquake (Fig. 12; [50]), registered in El Centro, California, USA, at 05/18/1940, with a magnitude of 6.9 M w and peak ground acceleration of 0.348 g on the S00E component was adopted. It was used because it is one of the most emblematic earthquakes, and also because in Brazil an earthquake of similar magnitude, according to [19], was occurred at 1955 in Porto dos Gauchos, State of Mato Grosso and had 6.2 m b . Figure 12 : Accelerograms of the Earthquake 2- El Centro . Figure 13 : Applying of the three accelerograms of each earthquake on the 3D numerical model.