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Your search keyword '"Felice G."' showing total 26 results
Start Over Author "Felice G." Publisher elsevier bv
26 results on '"Felice G."'

25. Low-impact techniques for seismic strengthening fair faced masonry walls

Author

Omar AlShawa, Marialuigia Sangirardi, Stefano De Santis, Luigi Sorrentino, Ivan Roselli, Domenico Liberatore, Gianmarco de Felice, Francesca Gobbin, De Santis, S., Alshawa, O., de Felice, G., Gobbin, F., Roselli, I., Sangirardi, M., Sorrentino, L., Liberatore, D., DE SANTIS, Stefano, Alshawa, Omar, DE FELICE, Gianmarco, Gobbin, Francesca, Roselli, Ivan, Sangirardi, Marialuigia, Sorrentino, Luigi, and Liberatore, Domenico

Subjects
Natural accelerogram, Shake table tests, Mortar-based composite, Mortar-based composites, Architectural heritage, Carbon fibre reinforced polymer (CFRP), Rubble masonry, General Materials Science, Geotechnical engineering, Composite reinforced mortar (CRM), Civil and Structural Engineering, Mortar joint repointing, Natural stone, business.industry, Building and Construction, Composite connector, Masonry, Stainless-steel, Debris, 2016–2017 Central Italy earthquakes, 3DVision, Composite connectors, 2016–2017 Central Italy earthquake, Earthquake shaking table, Mortar, Wall thickness, business, Shake table test, Geology
Abstract

Two techniques for the seismic strengthening of fair faced rubble masonry walls are proposed and tested on a shake table. The first solution entails the use of carbon fibre reinforced polymer connectors installed from outside through the natural stone units, without perforating the entire wall thickness, thus leaving the internal wall surface undisturbed. In the second solution, stainless-steel cords are embedded in repointed mortar joints of the fair face and connected, by means of stainless-steel bars, to a thermo-insulating composite reinforced mortar applied to the internal side. Shake table tests were performed under natural accelerograms on real scale multi-leaf rubble masonry walls, built with the stone units retrieved from the debris of a hamlet heavily damaged in the 2016 Central Italy earthquakes. Both strengthening solutions proved effective in enhancing the seismic capacity by preventing leaf separation and masonry disintegration, and in limiting damage development under earthquake excitation. Thanks to the compatibility with original materials and the preservation of the fair face, they are suitable for mitigating the seismic vulnerability of architectural heritage.

Published
2021
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26. Steel Reinforced Grout under uniaxial load: Experimental evidences and numerical modelling

Author

Marialuigia Sangirardi, Marialaura Malena, Gianmarco de Felice, Malena, M., Sangirardi, M., and de Felice, G.

Subjects
Materials science, Composite number, 0211 other engineering and technologies, 020101 civil engineering, 02 engineering and technology, engineering.material, Tensile tests, 0201 civil engineering, Brittleness, Experimental test, 021105 building & construction, Ultimate tensile strength, Retrofitting, General Materials Science, Civil and Structural Engineering, business.industry, Grout, Building and Construction, Structural engineering, Masonry, Cracking, Numerical modelling, engineering, SRG, Mortar, business
Abstract

The use of composite materials as structural retrofitting tools has been strongly encouraged by their capability of improving structural performance causing minimum invasiveness and reduced weight increment. For decades, Fiber Reinforced Polymers were considered the most suitable composites for retrofitting purposes but, more recently, technological issues have revealed some drawbacks, mainly related to their applications on masonry substrates. A viable alternative is represented by Fabric Reinforced Cementitious Matrix (FRCM), a class of composites made of high-strength textiles with inorganic matrix. Among them, Steel Reinforced Grout (SRG) systems, made of Ultra High Tensile Strength Steel cords embedded in cement or lime-based mortar, are widely used, particularly for repairing or strengthening masonry constructions. Qualification tests and acceptance criteria of these composites have been recently proposed. Numerical simulations of current available experimental test procedures need to be performed to provide a more rigorous insight into the mechanisms that control the composite response up to failure, namely the brittle cracking of the matrix, the ductile response of the steel and the debonding at the mortar-fabric interface. These aspects not only affect the microscale, but are indeed responsible for the macroscopic response of the composite. In this work a finite element simulation of direct tensile tests on SRG systems is presented. Two different gripping methods have been considered, the clamping-grip and the clevis-grip, which identify two standardized test procedures according to RILEM and ACI respectively. Numerical results are first compared with the experimental outcomes to assess the accuracy of the model in reproducing the quantitative and qualitative aspects of composite tensile response. Then, the effects of different boundary conditions on failure mechanisms are investigated, analysing damage and stress patterns in the constituents.

Published
2019
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