Retrofitting unreinforced masonry by steel fiber reinforced mortar coating: uniaxial and diagonal compression tests
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ORIGINAL ARTICLE
Retrofitting unreinforced masonry by steel fiber reinforced mortar coating: uniaxial and diagonal compression tests Sara S. Lucchini . Luca Facconi
. Fausto Minelli
. Giovanni Plizzari
Received: 14 April 2020 / Accepted: 30 October 2020 The Author(s) 2020
Abstract Thin layers of mortar reinforced with steel fibers can be applied on one or both sides of bearing walls as an effective seismic strengthening of existing masonry buildings. To assess the effectiveness of this technique, an experimental study on masonry subassemblages was carried out at the University of Brescia. This paper summarizes and discusses the main results of the investigation, which included mechanical characterization tests on masonry and its components as well as on the Steel Fiber Reinforced Mortar (SFRM) used to retrofit the masonry samples. Uniaxial and diagonal compression tests were carried out on both unstrengthened wallets and masonry samples retrofitted with 25 mm thick SFRM coating. Both single-sided and double-sided retrofitting configurations for application on wall surfaces were considered. The results highlighted the ability of the technique to improve the compressive and the shear behavior of masonry, even in case of single-sided
S. S. Lucchini L. Facconi F. Minelli (&) G. Plizzari Department of Civil, Architectural, Environmental Engineering and of Mathematics (DICATAM), University of Brescia, Brescia, Italy e-mail: [email protected] S. S. Lucchini e-mail: [email protected] L. Facconi e-mail: [email protected] G. Plizzari e-mail: [email protected]
strengthening. Moreover, no premature debonding of coating was observed. Lastly, the manuscript presents the results of a numerical investigation that was performed both to simulate the diagonal compression tests described in the first part of the paper and to predict the response of panels with different strengthening configurations. Keywords Masonry Hollow clay units Retrofitting Coating Steel fiber reinforced mortar Compressive strength Shear strength Numerical analysis
1 Introduction Unreinforced Masonry (URM) has been used for constructing a large number of buildings placed in seismic areas worldwide. The typical low tensile strength of URM makes existing buildings vulnerable to both in-plane and out-of-plane seismic actions [1, 2]. Thus, retrofitting interventions are frequently required to enhance masonry resistance and achieve the seismic safety level required by structural codes [3–5]. Many different technologies have been developed for strengthening and rehabilitating URM buildings. The traditional methods include surface treatments (i.e. shotcrete [6, 7], ferrocement, reinforced mortar
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coating [8]), prestressing with steel bars/ties and grout injections [9]. Besides these methods, other technologies have been recently developed by adopting advanced materials such as externally bonded fiberreinforced polymers (FRP), near-surface mounted FRP r
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