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Validation of the seismic response of an RC frame building with masonry infill walls - The case of the 2017 Mexico earthquake

  • Albornoz, Tania C. (Department of Civil Engineering) ;
  • Massone, Leonardo M. (Department of Civil Engineering) ;
  • Carrillo, Julian (Universidad Militar Nueva Granada, UMNG) ;
  • Hernandez, Francisco (Department of Civil Engineering) ;
  • Alberto, Yolanda (Department of Civil Engineering)
  • Received : 2021.08.21
  • Accepted : 2022.03.08
  • Published : 2022.07.25
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Abstract

In 2017, an intraplate earthquake of Mw 7.1 occurred 120 km from Mexico City (CDMX). Most collapsed structural buildings stroked by the earthquake were flat slab systems joined to reinforced concrete (RC) columns, unreinforced masonry, confined masonry, and dual systems. This article presents the simulated response of an actual six-story RC frame building with masonry infill walls that did not collapse during the 2017 earthquake. It has a structural system similar to that of many of the collapsed buildings and is located in a high seismic amplification zone. Five 3D numerical models were used in the study to model the seismic response of the building. The building dynamic properties were identified using an ambient vibration test (AVT), enabling validation of the building's finite element models. Several assumptions were made to calibrate the numerical model to the properties identified from the AVT, such as the presence of adjacent buildings, variations in masonry properties, soil-foundation-structure interaction, and the contribution of non-structural elements. The results showed that the infill masonry wall would act as a compression strut and crack along the transverse direction because the shear stresses in the original model (0.85 MPa) exceeded the shear strength (0.38 MPa). In compression, the strut presents lower stresses (3.42 MPa) well below its capacity (6.8 MPa). Although the non-structural elements were not considered to be part of the lateral resistant system, the results showed that these elements could contribute by resisting part of the base shear force, reaching a force of 82 kN.

Keywords

Acknowledgement

The authors thank Professor Hector Guerrero from the Institute of Engineering at the National University of Mexico (UNAM) for providing drawings, results of ambient vibration tests and preliminary numerical models of the Genova 70 building. Julian Carrillo thanks Vicerrectoria de Investigaciones at Universidad Militar Nueva Granada for providing research grants.

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