The paper presents the results of shaking table tests carried out on masonry systems (scaled 1:1) strengthened by energy absorption devices designed to improve the out of plane response. Outcomes are fairly satisfactory, with reference to available ductility and damage control provided by the selected devices
This paper is available in Italian only.
A novel interpretation of responses recorded during several shaking table tests allow a better under- standing of the effects on responses due to different strengthening interventions
Available in Italian only.
The paper shows the results obtained during experimental campaign of diagonal compression tests in Tuscany, in which a significant number of masonry panels were tested. The aims of this research are mainly two. On the one hand the authors compare medium values of shear strength and shear stiffness varying the knowledge level proposed in the OPCM 3431 code (LC1, LC2 and LC3). On the other hand, the authors verify shear strength and stiffness range value, given by OPCM 3431 code for masonry typology most recurring in Tuscany (Italy).
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In the present paper the results of an experimental study for the mechanic characterization of clay tile masonry walls under shear forces are discussed. Further in the paper the reliability of the models for the prediction of the mechanic characteristics under shear forces proposed by some codes is verified. Diagonal tests have been carried out; then the relationship of the Italian and European codes, correlating the mechanical properties of the components and the normal compression mechanical property of masonry to its shear mechanical properties (strength and elastic modulus), have been verified. This control has requested also normal compression tests on masonry walls made of the same blocks used for diagonal tests, on the blocks themselves and on the used mortar.
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he results of the tests on two masonry specimens in tuff elements bonded by pozzolanic mortar and retrofitting by jointed jacket, in unfavourable conditions, are described. The first test is deruled on originally wall «no jacket», by monotonic shear charge below limit service normal stress. The second test is evolved by cyclic quasi-static shear on masonry improvement with «jointed jacket» steel grid of the limitated surface and no blinded with adjacent ones, connected by tightening bolts for induced triaxial strength.
Emphasize the isotropic and homogeneous behaviour of the original masonry, in the service state limit in sintony to similar constitutive bond mortar/tuff; in particular the mortar resistance is measured by a new in situ torsional test compared with traditional test. The analysis of experimental data is developped principally by eurocode EC6 for masonry. The stiffness of fissured jacked wall is similar original masonry, and ultimate shear is 40% superior to original monotonic cracking test. The return to the pseudo elastic behaviour after improvement the first cracking, is emphasized from the absence of the permanent displacement and reduced isteretic phenomena in cyclic service state limit, while increase toward the ultimate limit state. The important role in bearing capacity of the friction Coulumbian model and specially cohesion value is back analysed from SLU and SLE before parzialitiation of the wall section, in particular in presence of the foundations settlements and revolution of the collapse moment/shear mechanism.
Available in Italian only.