Connection of Hollow-Core Slabs to Masonry Walls

空心板与砌体墙的连接

• 批准号: 570840-2021
• 负责人: ElSalakawy, Ehab
• 金额: $ 1.65万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 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=722529
• 关键词: Connection; Hollow; Core; Slabs; Masonry

Precast, prestressed hollow-core slabs (HCS) are widely used in building construction since they offer an economical solution for a floor or roof system, especially those with large spans. Other advantages of HCS include ease and speed of construction, high levels of fire resistance, enhanced durability, and sustainability. It was estimated that, between 1962 and 2016, more than 50 million square meters of HCS floors have been constructed in Canada. As standard construction practice, reinforcing bars are used to connect the HCS floors to the building structure. The current design manuals illustrate numerous examples of detailing for HCS bearing connections to supporting structures. However, due to lack of experimental data, a design methodology or an expected capacity are not included in the description. In collaboration with the Canadian Precast/Prestressed Concrete Institute, which is the prime source of technical information about precast/prestressed concrete in Canada, and Tower Engineering Group, a Canadian consulting firm with focus on precast buildings, the applicant has conducted an extensive research study to investigate the behaviour of bar connection configurations that are commonly used in Eastern Canada. It was concluded that such bar connections did not satisfy the requirements for masonry buildings of three-or-more storeys under tension forces. This indicates that currently used reinforcing bar connections cannot ensure the structural integrity of HCS floors. Based on the findings of the above study, this research proposal focuses on the connection between HCS and supporting masonry walls using typical Western Canada reinforcing bar details, which is expected to provide higher lateral capacity and a lower lateral displacement compared to Eastern Canada detailing. Full-scale laboratory testing, analytical and numerical investigations will be conducted to assess the performance of such connections. Four highly qualified personnel will be trained through this project. This work will result in reliable design guidelines and will lead to safe and new structures with improved performance and better durability for infrastructure owners such as Municipalities and Public Works.

预制预应力空心板（HCS）广泛用于建筑施工，因为它们为楼板或屋顶系统提供了经济的解决方案，特别是那些大跨度的楼板或屋顶系统。HCS的其他优点包括施工方便和快速，高水平的耐火性，增强的耐久性和可持续性。据估计，在1962年至2016年期间，加拿大建造了超过5000万平方米的HCS地板。作为标准的施工实践，钢筋用于将HCS地板连接到建筑结构。目前的设计手册中列举了许多HCS轴承与支撑结构连接的详细说明。然而，由于缺乏实验数据，设计方法或预期容量未包括在描述中。申请人与加拿大预制/预应力混凝土研究所（加拿大预制/预应力混凝土技术信息的主要来源）和塔工程集团（专注于预制建筑的加拿大咨询公司）合作，进行了广泛的研究，以调查加拿大东部常用的钢筋连接配置的行为。得出的结论是，这种钢筋连接不满足三层或三层以上砌体建筑物在拉力下的要求。这表明目前使用的钢筋连接不能保证HCS楼板的结构完整性。根据上述研究结果，本研究建议的重点是HCS和支撑砌体墙之间的连接，使用典型的加拿大西部钢筋详图，预计将提供更高的横向能力和更低的横向位移相比，加拿大东部详图。将进行全面的实验室测试、分析和数值研究，以评估此类连接的性能。将通过该项目培训四名高素质人员。这项工作将产生可靠的设计指南，并将为基础设施业主（如市政和公共工程）带来安全和新的结构，提高性能和更好的耐久性。