An innovative solution for the seismic protection of existing masonry structures is proposed and investigated through shake table tests on a natural scale wall assemblage. After a former test series carried out without reinforcement, the specimen was retrofitted using Steel Reinforced Grout. The strengthening system comprises horizontal strips of ultra-high strength steel cords, externally bonded to the masonry with hydraulic lime mortar, and connectors to transversal walls, applied within the thickness of the plaster layer. In order to assess the seismic performance of the retrofitted wall, natural accelerograms were applied with increasing intensity up to failure. Test results provide a deep understanding of the effectiveness of mortar-based composites for improving the out-of-plane seismic capacity of masonry walls, in comparison with traditional reinforcements with steel tie-bars. The structural implications of the proposed solution in terms of dynamic properties and damage development under earthquake loads are also discussed.
De Santis, S., Casadei, P., De Canio, G., de Felice, G., Malena, M., Mongelli, M., et al. (2016). Seismic performance of masonry walls retrofitted with steel reinforced grout. EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS, 45(2), 229-251 [10.1002/eqe.2625].
Seismic performance of masonry walls retrofitted with steel reinforced grout
De Santis, Stefano;de Felice, Gianmarco;Malena, Marialaura;
2016-01-01
Abstract
An innovative solution for the seismic protection of existing masonry structures is proposed and investigated through shake table tests on a natural scale wall assemblage. After a former test series carried out without reinforcement, the specimen was retrofitted using Steel Reinforced Grout. The strengthening system comprises horizontal strips of ultra-high strength steel cords, externally bonded to the masonry with hydraulic lime mortar, and connectors to transversal walls, applied within the thickness of the plaster layer. In order to assess the seismic performance of the retrofitted wall, natural accelerograms were applied with increasing intensity up to failure. Test results provide a deep understanding of the effectiveness of mortar-based composites for improving the out-of-plane seismic capacity of masonry walls, in comparison with traditional reinforcements with steel tie-bars. The structural implications of the proposed solution in terms of dynamic properties and damage development under earthquake loads are also discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
