Shear behavior of unreinforced and reinforced masonry panels subjected to in situ diagonal compression tests

Approach to safety evaluations issued by modern codes is clearly based on quantitative assessment of performances. As a consequence, validated mechanical parameters and numerical models should be made available on large scale for practical applications. This is the background of the present paper that deals with a specific type of masonry largely used in Central Italy and particularly in Umbria and Abruzzo region, whose territory exhibits a relevant seismic risk. A research project focused on the shear behavior of masonry panels subjected to in situ diagonal compression tests has been issued. The project consists of two parts: tests were performed on unreinforced and reinforced panels. As to the unreinforced panels, focusing attention on the diagonal cracking failure mode, the experimental research allowed to provide representative values of the mechanical parameters adopted to define the limit strength domain of some typical masonry walls in old buildings of Umbria and Abruzzo. Conversely, reinforced panels were tested aimed at investigating the effectiveness of existing methods of repair. A comparison between traditional and innovative seismic-upgrading techniques has been made in order to characterize the behavior of historical masonry walls under different strengthening configurations.

[1]  Maria Rosa Valluzzi,et al.  Mechanical behaviour of historic masonry structures strengthened by bed joints structural repointing , 2005 .

[2]  T. Triantafillou Strengthening of Masonry Structures Using Epoxy-Bonded FRP Laminates , 1998 .

[3]  Luigia Binda,et al.  MULTIPLE LEAF STONE MASONRY AS A COMPOSITE : THE ROLE OF MATERIALS ON ITS BEHAVIOUR AND REPAIR , 1998, PACT 1998.

[4]  A. Borri,et al.  Experimental evaluation of shear and compression strength of masonry wall before and after reinforcement: Deep repointing , 2008 .

[5]  E. Jacquelin,et al.  Analysis of the in-plane shear behaviour of FRP reinforced hollow brick masonry walls , 2005 .

[6]  Antonio Borri,et al.  Experimental study on the determination of strength of masonry walls , 2003 .

[7]  L. Binda The difficult choice of materials used for the repair of brick and stone masonry walls , 2006 .

[8]  Sergio Lagomarsino,et al.  Identification of Shear Parameters of Masonry Panels Through the In-Situ Diagonal Compression Test , 2008 .

[9]  C. Modena,et al.  Shear behavior of masonry panels strengthened by FRP laminates , 2002 .

[10]  M. Corradi,et al.  Strengthening techniques tested on masonry structures struck by the Umbria-Marche earthquake of 1997-1998 , 2002 .

[11]  Paulo B. Lourenço,et al.  On the strengthening of three-leaf stone masonry walls , 2008 .

[12]  Claudio Modena Repair and Upgrading Techniques of Unreinforced Masonry Structures Utilized after the Friuli and Campania/Basilicata Earthquakes , 1994 .