Avaliação Sísmica de Edifício de Pilotis. Estudo de caso no "Bairro das Estacas"

July 3, 2026

The aim of this dissertation is to conduct a seismic assessment of a building in Bairro das Estacas, built in 1952 in Alvalade, Lisbon, strongly influenced by principles of modernist architecture formulated by the architect Le Corbusier, particularly due to the use of Pilotis at the ground floor. The building was designed in accordance with the 1935 Regulamento do Betão Armado, without any explicit consideration of seismic action, leading to the under-design of several elements. This study included the analysis of the building’s structural system based on original documentation obtained from the Lisbon City Council Archives. Two numerical models were developed in SAP2000, with different levels of detail: a frame model and a shell model. Given the greater computational demand of the shell model, it was used as a reference to validate the frame model, namely through the Modal Assurance Criterion (MAC), with the latter being adopted in the subsequent stages of the study. The seismic assessment is performed through a nonlinear static analysis (Pushover analysis), following the guidelines of the Portuguese Standard of Eurocode 8, Part 3, with the safety of the building’s vertical elements being checked. The results reveal high seismic vulnerability in the building’s longitudinal direction, with most vertical elements failing to meet safety requirements under lateral loads. In the transverse direction, the formation of a soft-story mechanism on the ground floor is identified. The ductility of the columns is not found to be a limiting factor. Reinforcement solutions are also proposed on a strictly qualitative basis.

Authors in the community:

• 

  M

  Martim Maria Quartin Bastos Abecasis

  ist198743

Supervisors of this institution:

• 

  J

  Jorge Miguel Silveira Filipe Mascarenhas Proença

  ist12325

civil-engineering - Civil engineering

por - Portuguese

Instituto Superior Técnico