Performance evaluation of High-Performance Fibre-Reinforced Cementitious Composite slab-column connections

高性能纤维增强水泥基复合材料板柱连接性能评价

• 批准号: RGPIN-2017-04197
• 负责人: Genikomsou, Aikaterini
• 金额: $ 1.6万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=710925
• 关键词: Performance; evaluation; Fibre; Reinforced; Cementitious

As the growth of global construction keeps accelerating, structural engineers can serve as responsible stewards of the environment by introducing new technologies and materials for sustainable and resilient structures that help to preserve our resources while reducing the carbon foot print of construction. Based on the Canadian National Climate Change Policy, the cost of cement will increase dramatically in the coming years through carbon tax or a system of tradeable carbon emissions permits. In order to reduce cement production, a potential solution is to use High-Performance Fibre-Reinforced Cementitious Composites (HPFRCCs) in structures to increase sustainability through partial replacement of Portland Cement with fly ash. HPFRCCs are relatively new and innovative materials that resist large tensile and shear forces showing strain hardening in direct tension, increased toughness and ductility, crack control, enhanced performance in case of dynamic effects, and high-energy absorption capacity when compared to conventional concrete. Whereas the mechanical properties of HPFRCCs have been studied and are relatively well documented, research is required to develop models and establish design guidelines to enable large scale HPFRCC use in critical infrastructure. Flat slabs are widely used in many multistory buildings because of the many advantages that they provide, however, they are susceptible to punching shear failure. In this research program, a novel HPFRCC will be considered and the punching shear behaviour of slab-column connections will be investigated. The proposed research program will consider HPFRCC at the connections as an alternative for punching shear reinforcement. This work will first evaluate the mechanical properties of HPFRCC and then undertake an experimental investigation of punching shear in novel slab-column connections. In HPFRCC slabs the effect of the flexural reinforcement ratio will be examined considering potential reductions in steel reinforcement leading to benefits due to the reduced risk of corrosion. At the same time, the seismic performance of the proposed HPFRCC slabs will be examined considering the effect of gravity-induced shear on the rotation and drift capacity. Finally, the tested HPFRCC slabs will be analyzed using advanced nonlinear finite element analysis (FEA), where current and newly developed plasticity-damaged models will be considered. Parametric studies on the effects of concrete properties, reinforcement properties and placement, unbalanced moments, and support geometry on the punching shear strength of flat concrete slabs will be undertaken. This research program is designed to foster and inspire the training of highly qualified personnel (HQP) over a five year period through a combination of apprenticeship, mentorship and exposure to an exciting and rigorous research environment.

随着全球建筑业的不断加速增长，结构工程师可以通过引入新技术和材料来实现可持续和弹性结构，从而帮助保护我们的资源，同时减少建筑的碳足迹，从而成为负责任的环境管理员。根据加拿大国家气候变化政策，水泥成本将在未来几年通过碳税或可交易的碳排放许可证制度大幅增加。为了减少水泥生产，一个潜在的解决方案是在结构中使用高性能纤维增强水泥基复合材料（HPFRCC），通过用粉煤灰部分替代波特兰水泥来提高可持续性。HPFRCC是相对较新的创新材料，与传统混凝土相比，能够抵抗大的拉伸和剪切力，在直接拉伸中表现出应变硬化，增加韧性和延展性，裂缝控制，在动态效应的情况下增强性能，以及高能量吸收能力。尽管已经研究了HPFRCC的机械性能，并且有相对良好的记录，但需要进行研究以开发模型并建立设计指南，以使HPFRCC能够在关键基础设施中大规模使用。无梁楼盖由于其诸多优点而被广泛应用于多层建筑中，但其易受冲切破坏。在本研究计划中，将考虑一种新型的HPFRCC板柱连接的冲切性能进行研究。拟议的研究计划将考虑HPFRCC在连接作为一种替代冲切钢筋。本文首先对HPFRCC的力学性能进行了评价，然后对新型板柱节点的冲切性能进行了试验研究。在HPFRCC板中，考虑到钢筋的潜在减少，由于腐蚀风险降低而带来的好处，将检查抗弯钢筋比率的影响。同时，考虑重力剪切对板的旋转和漂移能力的影响，对所提出的HPFRCC板的抗震性能进行了检验。最后，测试HPFRCC板将使用先进的非线性有限元分析（FEA），其中当前和新开发的塑性损伤模型将被考虑。混凝土性能，钢筋性能和位置，不平衡的时刻，和支持的几何形状对平板混凝土板的冲切强度的影响的参数研究将进行。该研究计划旨在通过学徒制，导师制和接触令人兴奋和严格的研究环境相结合，在五年内培养和激励高素质人才（HQP）的培训。