Abstract
Recent research has underscored the effectiveness of engineered cementitious composites (ECC) in retrofitting unreinforced masonry (URM) structures. The retrofitting method of embedding ECC in the bed mortar joints is suitable for strengthening historic masonry buildings because the ECC can be concealed within the mortar joints. This study introduces an experimental campaign aimed at understanding the effects of this strengthening method on the in-plane seismic performance of URM walls. Four half-scale masonry walls, one of them unreinforced and the remaining three reinforced with ECC, were built and tested under in-plane cyclic loads. From the test results, it was found that the proposed retrofitting method can mitigate brittle diagonal shear damage and improve the integrity of the masonry walls. Furthermore, the results demonstrated that ECC reinforcement effectively increased the seismic behavior of URM walls in terms of shear bearing capacity, ductile behavior, stiffness degradation, and energy dissipation capacity. The ductility coefficient is defined as the ratio of ultimate displacement to yield displacement. The maximum lateral load and ductility coefficient of the reinforced masonry walls increased by a maximum of 26.08 and 25.77%, respectively, in comparison with the URM wall. Additionally, the lateral bearing capacity of both unreinforced and reinforced specimens was assessed using theoretical models. The results showed that the theoretical model could be used to predict the maximum lateral loads of the specimens, with the error of the calculated and tested maximum lateral loads being within 5%. The hysteresis curves of ECC-reinforced walls were predicted using an idealized trilinear model and a modified Clough model, and the applicability of the hysteresis model was assessed by comparing the force demand history and energy dissipation history of the computed and experimental hysteresis curves.
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The authors gratefully acknowledge the funding support provided by the National Natural Science Foundation of China (Grant Nos. 52078030 and 51678039).
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Jiejing Jing: Methodology, Data curation, Investigation, Writing—original draft preparation, Visualization. Changdong Zhou: Conceptualization, Methodology, Investigation, Writing—review & editing, Supervision, Funding acquisition.
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Jing, J., Zhou, C. Seismic performance of brick masonry walls strengthened with engineered cementitious composites under lateral cyclic loads. Bull Earthquake Eng (2024). https://doi.org/10.1007/s10518-024-01928-7
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DOI: https://doi.org/10.1007/s10518-024-01928-7