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Earthquakes and Structures Volume 24, Number 6, June 2023 , pages 439-453 DOI: https://doi.org/10.12989/eas.2023.24.6.439 |
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Study on the performance indices of low-strength brick walls reinforced with cement mortar layer and steel-meshed cement mortar layer |
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Lele Wu, Caoming Tang, Rui Luo, Shimin Huang, Shaoge Cheng and Tao Yang
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| Abstract | ||
| Older brick masonry structures generally suffer from low strength defects. Using a cement mortar layer (CML) or steel-meshed cement mortar layer (S-CML) to reinforce existing low-strength brick masonry structures (LBMs) is still an effective means of increasing seismic performance. However, performance indices such as lateral displacement ratios and skeleton curves for LBMs reinforced with CML or S-CML need to be clarified in performance-based seismic design and evaluation. Therefore, research into the failure mechanisms and seismic performance of LBMs reinforced with CML or S-CML is imperative. In this study, thirty low-strength brick walls (LBWs) with different cross-sectional areas, bonding mortar types, vertical loads, and CML/S-CML thicknesses were constructed. The failure modes, load-carrying capacities, energy dissipation capacity and lateral drift ratio limits in different limits states were acquired via quasi-static tests. The results show that 1) the primary failure modes of UBWs and RBWs are "diagonal shear failure" and "sliding failure through joints." 2) The acceptable drift ratios of Immediate Occupancy (IO), Life Safety (LS), and Collapse Prevention (CP) for UBWs can be 0.04%, 0.08%, and 0.3%, respectively. For 20-RBWs, the acceptable drift ratios of IO, LS, and CP for 20-RBWs can be 0.037%, 0.09%, and 0.41%, respectively. Moreover, the acceptable drift ratios of IO, LS, and CP for 40-RBWs can be 0.048%, 0.09%, and 0.53%, respectively. 3) Reinforcing low-strength brick walls with CML/S-CML can improve brick walls' bearing capacity, deformation, and energy dissipation capacity. Using CML/S-CML reinforcement to improve the seismic performance of old masonry houses is a feasible and practical choice. | ||
| Key Words | ||
| failure modes; lateral drift ratio limits; load-carrying capacities; load-displacement skeleton curve; lowstrength brick walls | ||
| Address | ||
| Lele Wu and Shaoge Cheng: China Academy of Building Research, Beijing 100013, China Caoming Tang, Shimin Huang and Tao Yang: 1) China Academy of Building Research, Beijing 100013, China, 2) Research Center for Disaster Prevention, Ministry of Housing and Urban-Rural Development, Beijing 100013, China Rui Luo: BUCG-CCCL Joint Venture, Beijing 100080, China | ||