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Some of the Latest Active Strengthening Techniques for Masonry Buildings: A Critical Analysis

Department of Civil, Environmental and Materials Engineering—DICAM, Alma Mater Studiorum Università di Bologna, Viale del Risorgimento 2, I40136 Bologna, Italy
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Materials 2019, 12(7), 1151; https://doi.org/10.3390/ma12071151
Received: 18 February 2019 / Revised: 12 March 2019 / Accepted: 13 March 2019 / Published: 9 April 2019
(This article belongs to the Special Issue Reinforcement and Repair Materials for Masonry Structures)
The present paper deals with the retrofitting of unreinforced masonry (URM) buildings, subjected to in-plane shear and out of-plane loading when struck by an earthquake. After an introductive comparison between some of the latest punctual and continuous active retrofitting methods, the authors focused on the two most effective active continuous techniques, the CAM (Active Confinement of Masonry) system and the Φ system, which also improve the box-type behavior of buildings. These two retrofitting systems allow increasing both the static and dynamic load-bearing capacity of masonry buildings. Nevertheless, information on how they actually modify the stress field in static conditions is lacking and sometimes questionable in the literature. Therefore, the authors performed a static analysis in the plane of Mohr/Coulomb, with the dual intent to clarify which of the two is preferable under static conditions and whether the models currently used to design the retrofitting systems are fully adequate. View Full-Text
Keywords: retrofitting; earthquakes; masonry; historical buildings; active reinforcement; Mohr’s circles; CAM system; Φ system retrofitting; earthquakes; masonry; historical buildings; active reinforcement; Mohr’s circles; CAM system; Φ system
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Ferretti, E.; Pascale, G. Some of the Latest Active Strengthening Techniques for Masonry Buildings: A Critical Analysis. Materials 2019, 12, 1151.

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