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: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=746383
• 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没有经过精心设计和详细设计以在地震灾害中表现良好，则很容易遭受严重损坏或倒塌。尽管钢筋混凝土砌体 (RCM) 建筑行业规模相当大，但对新型 RCM 系统抗震性能的研究却很有限。钢筋混凝土砌体剪力墙通常用于中高层砌体建筑，作为抗震系统（SFRS）的一部分，以提供抵抗地震产生的侧向荷载所需的侧向强度、刚度和耗能能力。对于新建和现有的 RCM 建筑来说，迫切需要开发新颖且富有创意的工程解决方案，以保护社会免受潜在的结构性地震破坏。 申请人研究计划的长期目标是增进对砌体结构抗震性能的理解，并利用这种理解开发模型、设计工具和规范规定，以促进可持续和抗震建筑的开发、设计和施工。抗灾砖石建筑。短期内，申请人将重点关注两个研究方向：（1）RCM建筑的抗震设计和细节设计； （2）钢筋混凝土砌体建筑的抗震改造。这两个轴内的具体研究将集中于 RCM 剪力墙，以： (1.a) 评估循环轴向应变下 RCM 边界单元的行为； (1.b) 制定带有边界单元的 RCM 剪力墙详图的规范规定，特别是墙腹板和边界单元之间的界面、墙腹板上的应变分布以及腹板上垂直钢筋的搭接拼接和边界元中； (1.c) 为延性 RCM 剪力墙中的重力墙和边界单元的垂直范围制定设计建议； (2.a) 开发使用纤维增强聚合物（FRP）复合材料的抗剪临界加固临界砌体墙的抗震改造方法； (2.b) 制定用于改造有缺陷的 RCM 墙的规范条款。 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着的社会经济效益，因为它将提高加拿大人的地震灾害安全性。实验测试将提供及时、有价值、多样化的数据库和基准，将为CSA S304 2024设计标准和NBCC 2025代码版本的开发做出重大贡献。该研究计划的成果将带来新的基础知识、施工实践的进步、规范设计规定和具体细节要求，以及高素质工程师和研究人员的专门培训。