Influence of Infill Panels on the Seismic Response of Existing RC Buildings: A Case Study
An analytical evaluation of the seismic response of irregular RC buildings with infill panels designed without considering modern seismic provisions is presented in this chapter. Many RC buildings have been built in the 1960s and 1970s in Italy (and many
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Influence of Infill Panels on the Seismic Response of Existing RC Buildings: A Case Study Marco Tanganelli, Stefania Viti, Mario De Stefano, and Andrei M. Reinhorn
Abstract An analytical evaluation of the seismic response of irregular RC buildings with infill panels designed without considering modern seismic provisions is presented in this chapter. Many RC buildings have been built in the 1960s and 1970s in Italy (and many other countries), before the seismic code was issued. Such buildings are usually irregular, due to mass and stiffness distribution, and they exhibit torsional effects when subjected to horizontal loads. One of the factors contributing to the torsional effects is the infill panels built on the perimeter of structures. Usually there is no discontinuity between the structure and the infill, so that the stiffness of the structure is largely affected by the distribution of the infill walls that can be irregular both in plan and in elevation. This work presents the effect of masonry infill in the seismic response of precode RC buildings. A numerical analysis has been performed on a case study, simulating the seismic response of the structure, including masonry infill panels. The case study of an existing building, rectangular in plan, having a mild mass eccentricity and an irregular distribution of infill panels, and, therefore, a different eccentricity at each storey is selected for the evaluation. The seismic performance of the building has been evaluated comparing the seismic response with the limit conditions provided by Italian Technical Code, both in terms of interstorey drift and shear capacity. The seismic response of the case-study building is satisfactory in respect to deformation parameters (chord rotation, top displacement, interstorey drift) but exhibits an unacceptable amount
M. Tanganelli • S. Viti • M. De Stefano () Dipartimento di Costruzioni e Restauro, Facoltà di Architettura, Università degli Studi di Firenze, Piazza Brunelleschi 6, 50121 Florence, Italy e-mail: [email protected]; [email protected]; [email protected] A.M. Reinhorn Department of Civil, Structural and Environmental Engineering, University at Buffalo, The State University of New York, 135 Ketter Hall, Amherst Campus, Buffalo, NY 14260, USA e-mail: [email protected] O. Lavan and M. De Stefano (eds.), Seismic Behaviour and Design of Irregular and Complex Civil Structures, Geotechnical, Geological and Earthquake Engineering 24, DOI 10.1007/978-94-007-5377-8__9, © Springer ScienceCBusiness Media Dordrecht 2013
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of shear in some of the elements, experiencing “short-column” failures. A possible solution for the problem is proposed, by removing some of the partial infill panels, in order to reduce the shear concentration demands and eccentricity.
9.1 Introduction Irregular RC buildings are an important part of the Italian modern constructions. In fact, there has been a peak in the construction activity in the years 1960 and 1970, before the seismic technical code was issued
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