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Buildings 2017, 7(3), 58; doi:10.3390/buildings7030058

Seismic Reinforcement of a R.C. School Structure with Strength Irregularities throughout External Bracing Walls

1
Department of Civil, Environmental Engineering and Architecture, University of Cagliari, 09123 Cagliari, Italy
2
Department of Energy, Systems, Territory and Construction Engineering, University of Pisa, 56126 Pisa, Italy
*
Author to whom correspondence should be addressed.
Received: 13 April 2017 / Revised: 24 June 2017 / Accepted: 26 June 2017 / Published: 29 June 2017
(This article belongs to the Special Issue Traditional and Innovative Approaches in Seismic Design)

Abstract

The effect of irregularities due to the non-uniform distribution of material properties on structural elements of a significant real case is here investigated. Mechanical tests performed on a typical Italian reinforced concrete (r.c.) school building built in the 1960s showed irregularity in the distribution of compression strength in columns, even though the construction is featured by substantially symmetric distribution of the frames. Extreme scenarios in the distribution of irregularities in compression strength of concrete columns are analyzed, with the hypothesis of rigid or deformable slabs. The seismic analysis showed the influence of the response due to the irregular distributions of concrete strength. A proposal of equivalent “material eccentricity” is shown to account for the mentioned irregularity. Furthermore, the practical solution of reinforcement to mitigate the effects of irregularities is also described. It consists of couple of external r.c. walls stiffened by r.c. buttresses added to the building, connected by transverse slabs. An extensive reduction of material eccentricity is achieved, together with a relevant improvement in seismic capacity. View Full-Text
Keywords: seismic analysis; material eccentricity; nonlinear static analysis; r.c. framed structure; structural irregularities; external bracing walls seismic analysis; material eccentricity; nonlinear static analysis; r.c. framed structure; structural irregularities; external bracing walls
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sassu, M.; Puppio, M.L.; Mannari, E. Seismic Reinforcement of a R.C. School Structure with Strength Irregularities throughout External Bracing Walls. Buildings 2017, 7, 58.

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