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, EhabEF
• 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: 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=749196
• 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、预应力空心芯板（HCS）广泛应用于建筑施工，因为它们为楼板或屋顶系统提供了一种经济的解决方案，特别是那些大跨度的楼板。HCS的其他优点包括施工方便、速度快、耐火性高、耐用性强、可持续性好。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，钢筋被用来连接HCS楼层和建筑结构。目前的设计手册列举了许多HCS轴承连接到支撑结构的详细示例。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。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（一家专注于预制建筑的加拿大咨询公司）合作，申请人进行了广泛的研究研究，以调查加拿大东部常用的杆连接配置的行为。结果表明，这种钢筋连接方式不能满足三层及以上砌体建筑在拉力作用下的要求。这说明目前使用的钢筋连接不能保证HCS楼板的结构完整性。基于上述研究结果，本研究方案将重点放在HCS与支撑砌体墙之间的连接上，使用典型的加拿大西部钢筋细部，与加拿大东部细部相比，这种细部有望提供更高的侧向承载力和更低的侧向位移。将进行全面的实验室测试、分析和数值研究，以评估这种连接的性能。通过这个项目将培养出四名高素质的人才。这项工作将产生可靠的设计指导方针，并将为市政和公共工程等基础设施业主提供性能更好、耐久性更好的安全新结构。