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Experimental and Theoretical Investigation on Masonry after High Temperature Exposure

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Abstract

The results of experimental investigation on the mechanical properties of clay brick masonry after high temperature exposition are here presented. The adopted physical model of masonry means to represent both new and old load bearing walls, so to get useful and applicable results. Uniaxial and diagonal compressive tests were carried on masonry samples exposed to 300 and 600°C. Samples of the component materials were tested in compression as well, and the elastic moduli of bricks and mortar were also measured. The results allow to evaluate the levels of residual strength and stiffness of all tested materials after exposure to high temperatures. Finally, property-temperature laws of mechanical decay for masonry, brick and mortar after high temperature exposition are here proposed and discussed.

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Abbreviations

Subscript θ :

denotes residual values of properties at temperature θ

E :

Initial elastic modulus of masonry (N/mm2)

E sec :

Secant elastic modulus of masonry at the maximum stress (N/mm2)

E b :

Initial elastic modulus of brick (N/mm2)

E m :

Initial elastic modulus of mortar (N/mm²)

f c :

Compressive strength of masonry (N/mm2)

f v :

Shear strength of masonry (N/mm2)

f bc :

Compressive strength of brick (N/mm2)

f bt :

Tensile strength of brick (N/mm2)

f mc :

Compressive strength of mortar (N/mm2)

f mf :

Flexural strength of mortar (N/mm2)

G :

Shear modulus of masonry (N/mm2)

γ :

Shear strain

γ 1 :

Peak shear strain

ε:

Normal strain

ε c1 :

Peak compressive strain of masonry

ε c2 :

Ultimate compressive strain of masonry (at 50% of the peak stress, in the post peak branch)

θ:

temperature (°C)

ν:

Poisson’s ratio of masonry

σ:

Normal stress (N/mm2)

τ:

Shear stress (N/mm2)

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Acknowledgements

The authors would like to thank Terreal Italia—San Marco Laterizi s.r.l., Noale (VE), for the support, and all the technicians at the Laboratory of Strength of Materials (LabSCo) of IUAV University of Venice.

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  1. Research Unit CdSM—“Assessment of monumental buildings”, IUAV University of Venice, Dorsoduro 2206, 30123, Venice, Italy

    S. Russo & F. Sciarretta

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  1. S. Russo
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Correspondence to F. Sciarretta.

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Russo, S., Sciarretta, F. Experimental and Theoretical Investigation on Masonry after High Temperature Exposure. Exp Mech 52, 341–359 (2012). https://doi.org/10.1007/s11340-011-9493-0

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