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A platform for research: civil engineering, architecture and urbanism
Cyclic in-plane behavior of unreinforced and confined masonry walls retrofitted by shotcrete: Experimental investigation
Highlights Compression, shear, and diagonal compression tests have been conducted to obtain the masonry properties. Six large-scale masonry walls have been tested under reversed cyclic in-plane loading. The results showed the efficiency of shotcrete layer as a retrofitting method to increase the ductility of masonry walls. The U-shaped concrete jackets are introduced and tested as an alternative to the concrete ties.
Abstract This study aimed to investigate the efficiency of shotcrete retrofitting method for seismic rehabilitation of conventional unreinforced and confined masonry walls. In this regard, six large-scale masonry walls have been built using fired clay bricks and sand-cement mortar. The specimens were listed as unreinforced and confined masonry walls with vertical concrete ties before and after retrofitting using shotcrete overlay. Moreover, a relatively new approach was adopted for seismic retrofitting of unreinforced masonry (URM) walls as an alternative to vertical concrete ties. Correspondingly, a series of material tests were carried out to obtain the mechanical properties of the masonry, in particular the compression test on masonry prisms, shear triplet, and diagonal compression tests. The masonry walls were tested under simultaneous gravity and reversed cyclic in-plane loading. The dominant failure mode of the URM wall was rocking, while in the case of shotcrete-retrofitted specimens, the failure mechanism was predominantly bed-joint sliding. Besides, the confined masonry walls with vertical ties failed mainly due to diagonal cracking. Evaluation of the cyclic performance of the specimens showed that vertical concrete ties significantly increased the ultimate lateral resistance and the cyclic dissipated energy, though a reduction in the ductility capacity was identified. The specimens retrofitted by shotcrete exhibited a significant enhancement in the lateral strength and a more gradual strength deterioration in the post-peak behavior, even though the shotcrete reinforcing bars were neither anchored to the foundation nor to the concrete ties. Furthermore, the shotcrete-retrofitted specimens exhibited maximum dissipated energy and minimum stiffness degradation among the specimens.
Cyclic in-plane behavior of unreinforced and confined masonry walls retrofitted by shotcrete: Experimental investigation
Highlights Compression, shear, and diagonal compression tests have been conducted to obtain the masonry properties. Six large-scale masonry walls have been tested under reversed cyclic in-plane loading. The results showed the efficiency of shotcrete layer as a retrofitting method to increase the ductility of masonry walls. The U-shaped concrete jackets are introduced and tested as an alternative to the concrete ties.
Abstract This study aimed to investigate the efficiency of shotcrete retrofitting method for seismic rehabilitation of conventional unreinforced and confined masonry walls. In this regard, six large-scale masonry walls have been built using fired clay bricks and sand-cement mortar. The specimens were listed as unreinforced and confined masonry walls with vertical concrete ties before and after retrofitting using shotcrete overlay. Moreover, a relatively new approach was adopted for seismic retrofitting of unreinforced masonry (URM) walls as an alternative to vertical concrete ties. Correspondingly, a series of material tests were carried out to obtain the mechanical properties of the masonry, in particular the compression test on masonry prisms, shear triplet, and diagonal compression tests. The masonry walls were tested under simultaneous gravity and reversed cyclic in-plane loading. The dominant failure mode of the URM wall was rocking, while in the case of shotcrete-retrofitted specimens, the failure mechanism was predominantly bed-joint sliding. Besides, the confined masonry walls with vertical ties failed mainly due to diagonal cracking. Evaluation of the cyclic performance of the specimens showed that vertical concrete ties significantly increased the ultimate lateral resistance and the cyclic dissipated energy, though a reduction in the ductility capacity was identified. The specimens retrofitted by shotcrete exhibited a significant enhancement in the lateral strength and a more gradual strength deterioration in the post-peak behavior, even though the shotcrete reinforcing bars were neither anchored to the foundation nor to the concrete ties. Furthermore, the shotcrete-retrofitted specimens exhibited maximum dissipated energy and minimum stiffness degradation among the specimens.
Cyclic in-plane behavior of unreinforced and confined masonry walls retrofitted by shotcrete: Experimental investigation
Rezaee, Seyed Rahman Seyed (author) / Soltani, Masoud (author) / Nikooravesh, Morteza (author)
Engineering Structures ; 264
2022-05-19
Article (Journal)
Electronic Resource
English
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