Seismic behaviour of tall reinforced masonry shear walls

加筋砌体（RM）在加拿大已经使用了50多年，主要用于建造中低层建筑。加拿大2015年国家建筑规范（NBC 2015）允许在高层砌体建筑中使用延性剪力墙，但在中等地震危险指数（0.75或更低）的场地，高度限制为60米（约20层），而在高地震危险场地（地震危险指数高于0.75），高度限制为40米（约13层）。尽管NBC 2015允许在加拿大建造高层建筑时使用延性RM墙，其高度限制与使用RC剪力墙的建筑相当，但这些建筑的实际现场应用仍然非常有限。到目前为止，加拿大只建造了几座高（20层以上）的RM建筑，大部分位于低到中等地震危险的地点。加拿大高层建筑的有限实地应用可以部分归因于过去关于该主题的实验研究的数据库稀缺。拟议的项目将检查加拿大现场应用的高钢筋砌体（TRM）剪力墙的地震反应，并有机会将这些知识出口到其他国家。该提案包括一个强大的实验和分析研究计划，将在不列颠哥伦比亚大学温哥华校区进行。具有高纵横比（范围从7.0到25.0）特征的TRM剪力墙试件的地震反应将在材料、结构构件和结构系统层面进行检查。采用实验与数值模拟相结合的方法，在系统层面研究TRM结构在地震激励下的地震反应。这被认为是混合技术在全球范围内首次应用于TRM墙体结构。本项目提出的实验方案将为从事高层建筑设计和施工的开发商、建筑师和工程师提供急需的与TRM剪力墙抗震性能相关的实验证据。从实验和分析研究中得出的指导方针将为目前没有接受过高层砌体建筑设计相关培训的设计工程师提供所需的工具。

Reinforced masonry (RM) has been used in Canada for more than 50 years, mostly for construction of low- and medium-rise buildings. The National Building Code of Canada 2015 (NBC 2015) permits the use of Ductile Shear Wall class for tall masonry buildings, but the height limit was set to 60 m (approximately 20 storeys) at sites characterized by moderate seismic hazard index (0.75 or less), and to 40 m (approximately 13 storeys) for high seismic hazard sites (seismic hazard index higher than 0.75). Although the NBC 2015 permits application of ductile RM wall class for construction of tall buildings in Canada, with the height limits comparable to buildings with RC shear walls, actual field applications of these buildings are still very limited. Only a few tall (20+ storey high) RM buildings have been constructed in Canada to date, mostly at sites with low to moderate seismic hazard. Limited field applications of tall buildings in Canada can be partially attributed to a scarce database of past experimental research studies on the subject.The proposed project will examine seismic response of Tall Reinforced Masonry (TRM) shear walls for field applications in Canada with opportunities to export this knowledge to other countries. The proposal includes a robust experimental and analytical research program which will be carried out at the University of British Columbia, Vancouver campus. Seismic response of TRM shear wall specimens characterized by high aspect ratios (in the range from 7.0 to 25.0) will be examined at the material, structural component, and structural system level. A hybrid experimental and numerical simulation will be performed at the system level to study seismic response of TRM buildings subjected to earthquake excitation. This is believed to be the first application of hybrid technology on TRM wall structures on a global scale. The experimental program proposed in this project will provide much needed experimental evidence related to seismic performance of TRM shear walls which is required for developers, architects, and engineers engaged in design and construction of tall buildings. The guidelines resulting from the experimental and analytical studies will provide required tools for design engineers who currently do not have adequate training related to design of tall masonry buildings.