Influence of infill distribution and design typology on seismic performance of low- and mid-rise RC buildings
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Influence of infill distribution and design typology on seismic performance of low- and mid-rise RC buildings Paolo Ricci · Maria Teresa De Risi · Gerardo Mario Verderame · Gaetano Manfredi
Received: 6 June 2012 / Accepted: 7 April 2013 © Springer Science+Business Media Dordrecht 2013
Abstract A growing attention has been addressed to the influence of infills on the seismic behavior of Reinforced Concrete buildings, also supported by the observation of damage to infilled RC buildings after severe earthquakes (e.g. L’Aquila 2009, Lorca 2011). In this paper, a numerical investigation on the influence of infills on the seismic behavior of four different case study buildings is carried out: four- and eight-storey buildings, designed for seismic loads according to the current Italian technical code or for gravity loads only according to an obsolete technical code, are considered. Seismic capacity at two Limit States (Damage Limitation and Near Collapse) is assessed through static push-over analyses, within the N2 spectral assessment framework. Different infill configurations are considered (Bare, Uniformly Infilled, Pilotis), and a sensitivity analysis is carried out, thus evaluating the influence of main material and capacity parameters on seismic response, depending on the number of storeys and the design typology. Fragility curves are obtained, through the application of a Response Surface Method. Seismic performance is also expressed in terms of failure probability, given a reference time period. Keywords Fragility
Reinforced concrete · Infills · Design typology · IN2 · Sensitivity analysis ·
1 Introduction During last decades, post-earthquake damage (e.g., Kocaeli 1999 (EERI 2000), L’Aquila 2009 (Ricci et al. 2010), Lorca 2011 (Cabañas et al. 2011)), numerical and experimental studies showed that a growing attention must be addressed to the influence of infills on the seismic behaviour of Reinforced Concrete (RC) buildings. Currently, infills are generally considered in RC buildings as partition elements without any structural function, thus
P. Ricci · M. T. De Risi (B) · G. M. Verderame · G. Manfredi Department of Structures for Engineering and Architecture, University of Naples Federico II, Via Claudio 21, 80125 Naples, Italy e-mail: [email protected]
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Bull Earthquake Eng
neglecting their significant influence on the increase in lateral stiffness and base shear, on the reduction in period of vibration, on possible brittle failure mechanisms in joints and columns due to local interaction between panels and adjacent structural elements, and on the building collapse mechanism. As far as performance of RC structures during L’Aquila earthquake (2009) is concerned, the main damage involved non-structural elements such as infill panels, and documented building collapses were essentially due to irregularities in plan or elevation caused also by distribution of non-structural elements (Ricci et al. 2010). Thus, infill panels have played an important role in the observed damage to RC structures (Verde
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