Shear Flat Jack Test for Evaluating Shear Characteristics on Unreinforced Masonry Structures

ABSTRACT

The shear properties of unreinforced masonry are key parameters used in order to understand the behaviour of these structures under horizontal actions. These characteristics are usually determined using Destructive Testing (DT) methods. However, this typology of tests is not always suitable due to both their high impact and cost. The present work aims to design, analyze and apply an innovative Minor Destructive Testing (MDT) technique for the determination of the shear mechanical properties. To limit the impact on the structure, the Flat Jack (FJ) technique was adopted. The geometrical configuration, chosen among six different layouts, was studied in order to comprehend the role-played by different parameters and to have then a mathematical model representative of the stresses inside of the sample. Finally, four in situ tests were executed and are analyzed and discussed.

KEYWORDS:

• Flat jack
• masonry
• MDT
• shear characteristics
• shear strength
• tensile strength
• unreinforced masonry

Acknowledgments

The authors are thankful to Cismondi Srl for the cooperation, material, equipment and work done for the execution of all of the tests performed.

The authors want to thank Federico Accornero for his help during the tests and, even more important, to give his knowledge, work and equipment for a preliminary application of the AE technique to the tests.

The support of the “Agenzia del Demanio” of Turin and of the “Ministero dei beni e delle attivita’ culturali e del turismo” (MiBAC) was indispensable to perform the test in Valfrè barrack.

The authors are also grateful to the town hall of Boves (in particular to Enzo Baudino) that allowed to perform the tests in the barrack of their property.

Disclosure statement

No potential conflict of interest was reported by the authors.