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Out-of-plane flexural behavior of brick masonry strengthened with engineered cementitious composites embedded in the horizontal mortar joint
Graphical abstract Display Omitted
Highlights Nine groups of masonry specimens were tested under four-point bending loads. Failure modes of un-strengthened and strengthened specimens were investigated. Stiffness, strength, energy dissipation capacity, and ductility were discussed. This method is effective in improving the flexural behavior of URM specimens. The bending capacity of the specimens was predicted by several analytical models.
Abstract Unreinforced masonry (URM) structures exhibit high vulnerability under out-of-plane loads. Engineered cementitious composite (ECC) is suitable for the reinforcement of URM structures due to its excellent mechanical properties. This study presents a promising method to strengthen brick masonry structures using ECC embedded in the horizontal mortar joints. In order to investigate the flexural behavior of brick masonry strengthened by the proposed method under one-way horizontal bending loads, a total of nine groups of masonry specimens were tested under four-point bending loads, including one group of un-strengthened specimens and eight groups of ECC-strengthened specimens. The mix proportion and reinforcement ratio of the ECC were considered as variables in the experimental schemes. The failure mode, load–displacement curves, stiffness, strength, energy dissipation capacity, and ductility of the specimens were discussed. The test results demonstrate the effectiveness of this strengthening system in improving the out-of-plane performance of URM structures. The tensile properties of the ECC were closely related to the out-of-plane flexural behavior of the strengthened specimens. The flexural performance of the strengthened specimens generally improved as the tensile properties of the ECC increased. The maximum mid-span loads and corresponding displacements increased by 34%-171% and 33%-163%, respectively, compared to the control specimens. Furthermore, the flexural stiffness of the strengthened specimens was enhanced by a maximum of 63%. The flexural strength and energy dissipation capacity of the strengthened specimens increased with the reinforcement ratio of the ECC. The maximum flexural strength and energy dissipation capacity of ECC-strengthened specimens were 2.39 and 7.01 times higher than those of un-strengthened specimens, respectively. In addition, the results showed that the maximum bending moments of un-strengthened and strengthened specimens could be better predicted by the existing theoretical model.
Out-of-plane flexural behavior of brick masonry strengthened with engineered cementitious composites embedded in the horizontal mortar joint
Graphical abstract Display Omitted
Highlights Nine groups of masonry specimens were tested under four-point bending loads. Failure modes of un-strengthened and strengthened specimens were investigated. Stiffness, strength, energy dissipation capacity, and ductility were discussed. This method is effective in improving the flexural behavior of URM specimens. The bending capacity of the specimens was predicted by several analytical models.
Abstract Unreinforced masonry (URM) structures exhibit high vulnerability under out-of-plane loads. Engineered cementitious composite (ECC) is suitable for the reinforcement of URM structures due to its excellent mechanical properties. This study presents a promising method to strengthen brick masonry structures using ECC embedded in the horizontal mortar joints. In order to investigate the flexural behavior of brick masonry strengthened by the proposed method under one-way horizontal bending loads, a total of nine groups of masonry specimens were tested under four-point bending loads, including one group of un-strengthened specimens and eight groups of ECC-strengthened specimens. The mix proportion and reinforcement ratio of the ECC were considered as variables in the experimental schemes. The failure mode, load–displacement curves, stiffness, strength, energy dissipation capacity, and ductility of the specimens were discussed. The test results demonstrate the effectiveness of this strengthening system in improving the out-of-plane performance of URM structures. The tensile properties of the ECC were closely related to the out-of-plane flexural behavior of the strengthened specimens. The flexural performance of the strengthened specimens generally improved as the tensile properties of the ECC increased. The maximum mid-span loads and corresponding displacements increased by 34%-171% and 33%-163%, respectively, compared to the control specimens. Furthermore, the flexural stiffness of the strengthened specimens was enhanced by a maximum of 63%. The flexural strength and energy dissipation capacity of the strengthened specimens increased with the reinforcement ratio of the ECC. The maximum flexural strength and energy dissipation capacity of ECC-strengthened specimens were 2.39 and 7.01 times higher than those of un-strengthened specimens, respectively. In addition, the results showed that the maximum bending moments of un-strengthened and strengthened specimens could be better predicted by the existing theoretical model.
Out-of-plane flexural behavior of brick masonry strengthened with engineered cementitious composites embedded in the horizontal mortar joint
Jing, Jiejing (author) / Zhou, Changdong (author) / Zhang, Chen (author) / Lin, Chunxian (author)
Engineering Structures ; 293
2023-07-19
Article (Journal)
Electronic Resource
English
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