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Earthquakes and Structures Volume 19, Number 6, December 2020 , pages 411-425 DOI: https://doi.org/10.12989/eas.2020.19.6.411 |
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Ultimate shear strength prediction model for unreinforced masonry retrofitted externally with textile reinforced mortar |
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Athanasia K. Thomoglou, Theodoros C. Rousakis, Dimitra V. Achillopoulou and Athanasios I. Karabinis
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| Abstract | ||
| Unreinforced masonry (URM) walls present low shear strength and are prone to brittle failure when subjected to in-plane seismic overloads. This paper discusses the shear strengthening of URM walls with Textile Reinforced Mortar (TRM) jackets. The available literature is thoroughly reviewed and an extended database is developed including available brick, concrete and stone URM walls retrofitted and subjected to shear tests to assess their strength. Further, the experimental results of the database are compared against the available shear strength design models from ACI 549.4R-13, CNR DT 215 2018, CNR DT 200 R1/2013, Eurocode 6 and Eurocode 8 guidelines as well as Triantafillou and Antonopoulos 2000, Triantafillou 1998, Triantafillou 2016. The performance of the available models is investigated and the prediction average absolute error (AAE) is as high as 40%. A new model is proposed that takes into account the additional contribution of the reinforcing mortar layer of the TRM jacket that is usually neglected. Further, the approach identifies the plethora of different block materials, joint mortars and TRM mortars and grids and introduces rational calibration of their variable contributions on the shear strength. The proposed model provides more accurate shear strength predictions than the existing models for all different types of the URM substrates, with a low AAE equal to 22.95%. | ||
| Key Words | ||
| URM; TRM; in plane performance; strengthening; design models; diagonal compression; codes; proposed design model | ||
| Address | ||
| Athanasia K. Thomoglou, Theodoros C. Rousakis and Athanasios I. Karabinis: Civil Engineering Department, Democritus University of Thrace (DUTh), Kimmeria, 67100 Xanthi, Greece Dimitra V. Achillopoulou: Civil Engineering Department, Democritus University of Thrace (DUTh), Kimmeria, 67100 Xanthi, Greece/ Civil and Environmental Engineering Department, University of Surrey, Guildford, GU2 7XH, United Kingdom | ||