Earthquake-resistant design evaluation applying fragility curves

Author(s)

Camila Lemes Carobeno

• Document type: Master's Dissertation
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Civil, Arquitetura e Urbanismo
• Defense date: 2024-01-23

Examining board members

Gustavo Henrique Siqueira; Thomaz Eduardo Teixeira Buttignol; Humberto Varum

• Advisor: Gustavo Henrique Siqueira

Abstract

The design codes for earthquake-resistant structures use strength and capacity methodologies to ensure resistance. However, performance methods have become noteworthy over the years, as they enable the design of structures with controllable behavior under defined levels of risk. The risk analysis considers three factors: threat, vulnerability, and exposure. Therefore, although Brazil is located in an intraplate region with earthquakes of medium or low magnitude, this effect cannot be underestimated, as the structural vulnerability can make the consequences of these earthquakes potentially high. Whilst the current Brazilian seismic standard is ABNT NBR 15421 (2023), recent studies indicate the continued understanding of the national seismic scenario. Furthermore, main international seismic codes are intensifying their design measures by including performance methods. Hence, this work aims to evaluate and compare earthquake-resistant designs based on strength and capacity methods with the methodology of performance due to seismic fragility. A typical Brazilian reinforced concrete structure is considered under low, medium, and high seismicity, applying national and European codes for the structure’s design. A performance analysis establishes the history-time of seismic events, the probabilistic seismic demand model, and the capacity of the components. Finally, the results are evaluated and compared regarding performance, collapse mechanism, ductility gain, energy dissipation, modal analysis, incremental dynamic analysis, fragility, limit states, and damage caused to the structure. Among the main conclusions is the importance of adopting a global ductility condition for ductile design with large energy dissipation, besides the impact of seismic detailing on the collapse mechanism. Thereby, this work indicates conditions for studying and improving the national seismic design (AU)

• FAPESP's process: 21/03773-7 - Earthquake-resistant design evaluation applying fragility curves
• Grantee: Camila Lemes Carobeno
• Support Opportunities: Scholarships in Brazil - Master