Evaluation of structural reliability. Review of design methodologies and seismic performance evaluation of reinforced concrete structures
(English) Seismic risk and structural reliability are fundamental concepts in the design and evaluation of safe and resilient buildings. It should be noted that most of the casualties, injuries and economic losses during an earthquake are associated with damage to civil structures. In this context,...
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| Tipo de recurso: | tesis doctoral |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/449599 |
| Acceso en línea: | https://hdl.handle.net/2117/449599 https://dx.doi.org/10.5821/dissertation-2117-449599 |
| Access Level: | acceso abierto |
| Palabra clave: | Análisis dinámico no lineal Medidas de intensidad sísmica Eficiencia Estabilidad Análisis espectral Funciones de transferencia Configuración estructural Curvas de fragilidad Daño Confiabilidad estructural 624 - Enginyeria civil i de la construcció en general Àrees temàtiques de la UPC::Enginyeria civil |
| Sumario: | (English) Seismic risk and structural reliability are fundamental concepts in the design and evaluation of safe and resilient buildings. It should be noted that most of the casualties, injuries and economic losses during an earthquake are associated with damage to civil structures. In this context, there is an urgent need to improve the design and evaluation methodologies of this type of structures. From a numerical perspective, several strategies can address this need, ranging from improvements in modeling and advanced analysis methods, to the probabilistic analysis of the variables involved (such as seismic hazard), including the review of configuration and material properties of the systems under study. Therefore, this research proposes a methodology to evaluate structural reliability using a probabilistic approach, validated through nonlinear dynamic analysis and a statistical cloud study. This methodology constitutes a robust and powerful tool, applicable not only at the building level but also at urban and regional scales. For this purpose, it is proposed to study a set of reinforced concrete buildings with variable configurations in both plan and elevation. These models represent real buildings, that were recently designed and constructed, located in areas of high seismicity in Colombia, for which the most modern seismic-resistant design standards have been followed. This thesis is divided into three main sections: 1) Calculation of improved intensity measures, in terms of efficiency and steadfastness, to derive more accurate fragility curves; 2) Development of a probabilistic analysis methodology to estimate, with high statistical accuracy and reduced time, the dynamic response of tall buildings by using transfer functions; and 3) Evaluation of structural reliability, based on the probability of exceeding different damage indices and thresholds at different levels of seismic intensity. The first part focuses on identifying and developing optimal and improved intensity measures, based on the efficiency and steadfastness they show as correlated with the structural response of complex systems. An optimal seismic intensity measure enables the development of more accurate fragility curves, which are essential for assessing the probability of damage in a structure under different seismic intensity levels. The second part focuses on the development of a structural analysis method based on the transfer function (TF) concept. This mathematical model establishes the relationship between the response of a system and the input excitation. The proposed approach allows probabilistic estimation, while maintaining statistical accuracy, of the nonlinear dynamic response. It aims to overcome the limitations of the high computational cost associated with nonlinear dynamic analysis. Finally, the third part focuses on calculating the structural reliability of two real buildings located in a high seismicity zone, evaluating the probability of exceeding different damage thresholds. The results obtained show that intensity measures based on velocity present a higher correlation with the structural response, regardless of whether they are analyzed as a whole. This will make it possible to evaluate risk scenarios in large areas by means of fragility curves that adequately represent different structural typologies, facilitating a better characterization of urban environments. Likewise, it is observed that the developed method, by using a reduced number of seismic records, allows obtaining reliable results in terms of the principal statistical moments of the structural response of complex systems, and importantly, in a considerably shorter time. In conclusion, this research presents a series of advanced numerical tools that allow the calculation of damage scenarios, while optimally accounting for seismic hazard, and using methodologies that significantly reduce the time required to estimate the structural reliability of a set of buildings. |
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