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A platform for research: civil engineering, architecture and urbanism
SEISMIC FRAGILITY ASSESSMENT OF CODE-CONFORMING BUILDINGS IN ITALY
The current European building codes, espousing performance-based seismic design principles, require safety verifications of structures under different levels of earthquakes. Although design seismic actions are prescribed on a probabilistically uniform basis referring to specific earthquake return periods, an explicit control of structural reliability of new constructions has not been implemented into the current practice. To assess implicit seismic risk of new constructions in Italy, a large national research project, named Rischio Implicito Norme Tecniche per le Costruzioni (RINTC), was developed for the years 2015-2017. One of the main contributions of this thesis is to gather insights into seismic risk of Italian code-conforming structures from a large building data set of the project. From a seismic design point of view, seismic performance of the prototype buildings is discussed through SDoF approximation of the detailed structural models, maintaing a wide variety of structural types, configurations, and seismic hazard levels at the building site. The study presented herein describes that heterogeneity of seismic risk among different structural types and different sites is mainly ascribed to actual strength reduction factors and local seismicity above the design seismic action. The thesis also provides seismic fragility functions of the examined prototype buildings, which are estimated through state-of-the-art approaches in performance-based earthquake engineering. For all examined buildings, fragility curves are estimated in terms of spectral acceleration at the fundamental vibration period of the structure, that is structure-specific. For the sake of comparison of structural fragility across multiple buildings, PGA-fragility curves are also examined for some selected building cases. To this aim, a probabilistic framework for hazard-consistent intensity measure conversion is established. Furthermore, the effects of seismic sequences in long-term seismic risk assessment of structures are also addressed given that the current seismic design philosophy neglects damage accumulation in structures.
SEISMIC FRAGILITY ASSESSMENT OF CODE-CONFORMING BUILDINGS IN ITALY
The current European building codes, espousing performance-based seismic design principles, require safety verifications of structures under different levels of earthquakes. Although design seismic actions are prescribed on a probabilistically uniform basis referring to specific earthquake return periods, an explicit control of structural reliability of new constructions has not been implemented into the current practice. To assess implicit seismic risk of new constructions in Italy, a large national research project, named Rischio Implicito Norme Tecniche per le Costruzioni (RINTC), was developed for the years 2015-2017. One of the main contributions of this thesis is to gather insights into seismic risk of Italian code-conforming structures from a large building data set of the project. From a seismic design point of view, seismic performance of the prototype buildings is discussed through SDoF approximation of the detailed structural models, maintaing a wide variety of structural types, configurations, and seismic hazard levels at the building site. The study presented herein describes that heterogeneity of seismic risk among different structural types and different sites is mainly ascribed to actual strength reduction factors and local seismicity above the design seismic action. The thesis also provides seismic fragility functions of the examined prototype buildings, which are estimated through state-of-the-art approaches in performance-based earthquake engineering. For all examined buildings, fragility curves are estimated in terms of spectral acceleration at the fundamental vibration period of the structure, that is structure-specific. For the sake of comparison of structural fragility across multiple buildings, PGA-fragility curves are also examined for some selected building cases. To this aim, a probabilistic framework for hazard-consistent intensity measure conversion is established. Furthermore, the effects of seismic sequences in long-term seismic risk assessment of structures are also addressed given that the current seismic design philosophy neglects damage accumulation in structures.
SEISMIC FRAGILITY ASSESSMENT OF CODE-CONFORMING BUILDINGS IN ITALY
Suzuki, Akiko (author)
2019-06-11
Suzuki, Akiko (2019) SEISMIC FRAGILITY ASSESSMENT OF CODE-CONFORMING BUILDINGS IN ITALY. [Tesi di dottorato]
Theses
Electronic Resource
Italian , English
DDC:
500
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