Abstract
This study is focused on reinforced concrete (RC) structures located in the neighbourhood of “Alvalade” (Lisbon). They were mainly constructed during the 50s, prior to the application of more demanding seismic codes. Two case studies of two structural configurations have been selected to be analysed: framed and wall-frame buildings. They are representative of Lisbon’s current building stock and present a considerable seismic vulnerability. Typical irregularities identified in this study, which can worsen the seismic performance of these buildings, are: (i) the heterogenic distribution of infills, and; (ii) the irregular height of the columns. The main goal of this research is to analyse how these irregularities affect the seismic behaviour of these representative RC buildings. To do so, nonlinear static analyses have been carried out, and the N2 method and its extended version has been considered. Different versions of the buildings have been defined varying the position of the infills and the height of the columns and the walls. Results have shown that the buildings with irregularities in height present lower values of stiffness and strength. It has been proved that the infills increase the models’ overall stiffness and strength. However, if they are no regularly distributed the performance can be worsened. It has been concluded that retrofitting measures should be taken into account to prevent the shear failure of the RC building structures analysed to comply with the safety requirements of the EC8-3.
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Acknowledgements
The authors would like to acknowledge the financial support of Fundação para a Ciência e a Tecnologia (FCT, Ministério da Educação e Ciência, Portugal) through the scholarship BL105/2019 through the FCT Research Program: MitRisk—Framework for seismic risk reduction resorting to cost-effective retrofitting solutions, POCI-01-01456-Feder-031865. In addition, the scholarship provided by the VI-PPI of the University of Seville is acknowledged.
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Requena-Garcia-Cruz, MV., Couto, R., Bento, R., Morales-Esteban, A. (2022). Seismic Assessment of RC Buildings Considering the Influence of Vertical Irregularities: Framed and Wall-Frame Structures. In: Bento, R., De Stefano, M., Köber, D., Zembaty, Z. (eds) Seismic Behaviour and Design of Irregular and Complex Civil Structures IV. Geotechnical, Geological and Earthquake Engineering, vol 50. Springer, Cham. https://doi.org/10.1007/978-3-030-83221-6_24
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