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Eleonora Mannari
Department of Energy, Systems, Territory and Construction Engineering, University of Pisa, 56126 Pisa, Italy

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Journal article
Published: 29 June 2017 in Buildings
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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.

ACS Style

Mauro Sassu; Mario Lucio Puppio; Eleonora Mannari. Seismic Reinforcement of a R.C. School Structure with Strength Irregularities throughout External Bracing Walls. Buildings 2017, 7, 58 .

AMA Style

Mauro Sassu, Mario Lucio Puppio, Eleonora Mannari. Seismic Reinforcement of a R.C. School Structure with Strength Irregularities throughout External Bracing Walls. Buildings. 2017; 7 (4):58.

Chicago/Turabian Style

Mauro Sassu; Mario Lucio Puppio; Eleonora Mannari. 2017. "Seismic Reinforcement of a R.C. School Structure with Strength Irregularities throughout External Bracing Walls." Buildings 7, no. 4: 58.