Abstract
A back analysis aimed at the evaluation of reinforced concrete frame buildings performance during the 2011 Lorca, Spain, earthquake is provided by applying FAST method. This is a simplified approach for the estimation of largescale vulnerability of RC moment resisting frame buildings. It accounts for the structural contribution of non-structural masonry infills. Lorca earthquake showed a Peak Ground Acceleration (PGA) three times higher with respect to that recommended by local design code. However, damage observed seldom included building collapses. Characteristics of the seismic event and features of the local building stock are studied aimed at showing, through the application of FAST, whether the low amount of collapses could be a consequence of the additional contribution provided by infills, despite their non-structural role in local code design framework. FAST damage scenario showed a fair agreement with observed damage, providing a confirmation on the structural role played by masonry infills.
Highlights
A back analysis aimed at the evaluation of reinforced concrete frame buildings performance during the 2011 Lorca, Spain, earthquake is provided by applying FAST method
Todas ellas coinciden en señalar que, teniendo en cuenta el alto valor de aceleración máxima de pico registrada (PGA) con respecto a la aceleración básica para Lorca, la cantidad de daños estructurales graves o colapsos es relativamente baja, comportamiento que atribuyen al elevado coeficiente de seguridad provisto por las sucesivas normas sísmicas
Eurocode 8: design of structures for earthquake resistance-part 3: assessment and retrofitting of buildings
Summary
El terremoto de Lorca 2011 constituye una referencia obligada a fin de evaluar la idoneidad de las distintas tipologías y normas sísmicas nacionales. Todas ellas coinciden en señalar que, teniendo en cuenta el alto valor de aceleración máxima de pico registrada (PGA) con respecto a la aceleración básica para Lorca, la cantidad de daños estructurales graves o colapsos es relativamente baja, comportamiento que atribuyen al elevado coeficiente de seguridad provisto por las sucesivas normas sísmicas. Diversos enfoques han sido propuestos para la evaluación del comportamiento de esta tipología estructural: desde aquéllos a media o gran escala, que se basan en la obtención indirecta de curvas de capacidad en base a las propiedades mecánicas (7) (8) como aquéllos a escala de edificio, que proponen modelaciones explícitas para la tabiquería (9). Para el caso del terremoto de Lorca, se han llevado a cabo análisis de la influencia de la tabiquería mediante modelos no lineales de elementos finitos (10) o modelos energéticos (11), ambos centrados, por el contrario, en la influencia negativa de la tabiquería
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