Seismic Design, Detailing, and Retrofit of Reinforced Concrete Masonry Shear Walls

钢筋混凝土砌体剪力墙的抗震设计、详图和改造

• 批准号: RGPIN-2020-05540
• 负责人: Galal, Khaled
• 金额: $ 2.62万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=740643
• 关键词: Seismic; Design; Detailing; Retrofit; Reinforced

Canada has active seismic zones in its western and eastern regions. Buildings located in these areas are prone to severe damage or collapse if they are not designed and detailed to perform well under seismic hazard. Despite the considerable size of the reinforced concrete masonry (RCM) construction industry, there has been limited research that investigates the seismic performance of new RCM systems. Reinforced concrete masonry shear walls are typically used in medium- to high-rise masonry buildings as part of the seismic force-resisting system (SFRS) to provide the lateral strength, stiffness, and energy dissipation capacity required to resist the lateral loads arising from earthquakes. For both new and existing RCM buildings, there is a vital need to develop novel and creative engineering solutions to safeguard society against potential structural seismic failures. The long-term objective of the applicant's research program is to advance the understanding of the seismic behaviour of masonry structures, and utilize that understanding to develop models, design tools, and code provisions to facilitate the development, design, and construction of sustainable and seismic hazard-resilient masonry buildings. In the short-term, the applicant will focus on two research axes: (1) The seismic design and detailing of RCM buildings; and (2) The seismic retrofit of reinforced concrete masonry buildings. The specific research within these two axes will focus on RCM shear walls to: (1.a) Evaluate the behaviour of RCM boundary elements under cyclic axial strains; (1.b) Develop code provisions for the detailing of RCM shear walls with boundary elements, specifically, the interface between the wall's web and the boundary element, the strain distribution in the wall's web, and the lap splicing of vertical reinforcements in the web and in the boundary element; (1.c) Develop design recommendations for the gravity walls and vertical extents of boundary elements in ductile RCM shear walls; (2.a) Develop seismic retrofit methods for shear critical reinforced critical masonry walls using fibre-reinforced polymer (FRP) composites; and (2.b) Develop code provisions for retrofitting deficient RCM walls. This research program will make significant contributions to enhancing the seismic performance of new and retrofitted RCM buildings. This improved seismic performance will result in significant socio-economic benefits to Canada, as it will enhance seismic hazard safety for Canadians. The experimental tests will provide a timely, valuable, and diversified database and benchmark that will significantly contribute to the development of the CSA S304 2024 design standard and the NBCC 2025 code edition. The outcomes of this research program will result in new fundamental knowledge, advancements in construction practices, code design provisions and specific detailing requirements, in addition to the specialized training of highly qualified engineers and researchers.

加拿大的西部和东部地区都有活跃的地震带。位于这些地区的建筑物如果设计和细节不能很好地应对地震危险，就容易受到严重破坏或倒塌。尽管钢筋混凝土砌体（RCM）建筑行业的规模相当大，但研究新型RCM系统抗震性能的研究有限。钢筋混凝土砌体剪力墙通常用于中高层砌体建筑中，作为抗震系统（SFRS）的一部分，提供抵抗地震引起的侧向荷载所需的侧向强度、刚度和耗能能力。无论是新的还是现有的RCM建筑，都迫切需要开发新颖的、创造性的工程解决方案，以保护社会免受潜在的结构地震破坏。申请人的研究项目的长期目标是推进对砌体结构地震行为的理解，并利用这种理解来开发模型、设计工具和规范规定，以促进可持续和抗震抗灾砌体建筑的开发、设计和建造。在短期内，申请人将专注于两个研究轴：(1)RCM建筑的抗震设计和细节；(2)钢筋混凝土砌体建筑的抗震加固。在这两个轴线范围内的具体研究将集中在RCM剪力墙上：(1)；a)评价RCM边界元在循环轴向应变作用下的行为；（1.b)制定具有边界单元的RCM剪力墙的详细规范规定，特别是墙腹板与边界单元之间的界面，墙腹板中的应变分布以及腹板和边界单元中垂直钢筋的搭接；（1.c）制定韧性RCM剪力墙重力墙和边界元素垂直范围的设计建议；（2.a)采用纤维增强聚合物（FRP）复合材料开发抗剪临界增强临界砌体墙的抗震加固方法；和(2。b)制定有缺陷的RCM墙的改造规范。该研究项目将为提高新建和改造的RCM建筑的抗震性能做出重大贡献。这种改进的抗震性能将为加拿大带来显著的社会经济效益，因为它将提高加拿大人的地震危险安全。实验测试将提供一个及时、有价值和多样化的数据库和基准，这将对CSA S304 2024设计标准和NBCC 2025代码版的发展做出重大贡献。这项研究计划的成果将带来新的基础知识，建筑实践的进步，规范设计规定和具体的细节要求，以及高素质的工程师和研究人员的专业培训。