Novel structural systems and materials for concrete construction

混凝土建筑的新型结构体系和材料

• 批准号: RGPIN-2020-04725
• 负责人: Polak, MariaAnna
• 金额: $ 2.26万
• 依托单位: University of Waterloo
• 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=748827
• 关键词: Novel; structural; systems; materials; concrete

The proposed research program aims at advancing concrete construction. The outcomes of this research will impact safety, durability and constructability of future concrete infrastructure. Structural concrete is the most utilized building material in the world and considering that most people spend majority of their time and daily activities in the built environment, it is logical that infrastructure accounts for at least 3.5% of GDP in most countries and around 8% in Canada. Therefore, research on functional, energy efficient and safe infrastructure is of strategic importance. This research addresses design of concrete members under gravity and seismic loads, new concepts for reinforcing concrete flat slabs supported on columns in seismic regions, concrete members reinforced using fibre reinforced plastic (FRP) reinforcements, testing protocols for FRP bars, and novel hybrid system for concrete frames for seismic applications. Laboratory testing, theoretical, and numerical research will be undertaken, providing excellent training opportunities for a new generation of engineers. The concrete slab research will focus on novel punching shear reinforcing system, which provides ductility and allows energy dissipation during earthquakes. Special flexible shear reinforcing solution will be developed. Large-scale laboratory testing will be followed by finite element analysis (FEA) and parametric studies to extend the experimental results and allow proposing design methodologies. Utilization of glass FRP (GFRP) reinforcements for concrete has been driven primarily by problems with corrosion of steel reinforcements. GFRP bars are strong but brittle and thus GFRP reinforced concrete members behave differently than traditional steel reinforced members; they rely on concrete to provide ductility. Nonlinear FEA studies and mechanical modelling of GFRP reinforced concrete using strut-and tie approach will be done. Material testing protocols will be researched in order to simplify testing and provide practical means for assessment of bars' quality. Non-destructive durability assessments will be correlated with mechanical long-term testing. Seismic application of GFRP bars will be studied in an innovative concept of hybrid steel-GFRP sections for creating predetermined hinges in concrete frame buildings in seismic zones. The concept has been investigated theoretically and shows great practical potential. A laboratory testing program is planned to include continuous hybrid concrete beams with various arrangement of steel and GFRP reinforcements. The possibility of utilizing fibre reinforced concretes (FRC) with GFRP reinforcements will be investigated to create corrosion resistant and ductile concrete slab-column connections. Such hybrid steel-GFRP concrete systems can be practical as corrosion resistant systems for structures and bridges in Canada, in cold climate countries, and in coastal regions affected by oceanic salt water.

建议的研究计划旨在推进混凝土施工。这项研究的结果将影响未来混凝土基础设施的安全性、耐久性和可施工性。结构混凝土是世界上使用最多的建筑材料，考虑到大多数人在建筑环境中花费大部分时间和日常活动，基础设施在大多数国家至少占GDP的3.5%，在加拿大约占8%。因此，研究功能、节能和安全的基础设施具有重要的战略意义。 这项研究解决了重力和地震荷载下的混凝土构件的设计，新概念的钢筋混凝土平板柱上支持在地震区，混凝土构件用纤维增强塑料（FRP）钢筋，FRP筋的测试协议，和新的混合系统的混凝土框架抗震应用。将进行实验室测试，理论和数值研究，为新一代工程师提供良好的培训机会。 混凝土板的研究将集中在新的冲切加固系统，提供延性，并允许在地震期间的能量耗散。将开发特殊的柔性抗剪加固解决方案。大型实验室测试之后将进行有限元分析（FEA）和参数研究，以扩展实验结果并提出设计方法。 玻璃纤维增强塑料（GFRP）钢筋混凝土的使用主要是由钢筋腐蚀的问题。GFRP筋是强而脆的，因此GFRP钢筋混凝土构件的行为不同于传统的钢筋构件;它们依赖于混凝土来提供延性。采用拉压杆法对GFRP加固混凝土进行非线性有限元分析和力学建模。研究材料试验规程，简化试验，为棒材质量评定提供实用手段。非破坏性耐久性评估将与机械长期测试相关联。将在钢-GFRP混合型材的创新概念中研究GFRP筋的抗震应用，以在地震区的混凝土框架建筑中创建预定的铰链。这一概念已在理论上进行了研究，并显示出巨大的实用潜力。一个实验室测试计划，包括连续混合混凝土梁与各种安排的钢和GFRP钢筋。 利用纤维增强混凝土（FRC）与玻璃纤维增强塑料加固的可能性将被调查，以创建耐腐蚀和延性混凝土板柱连接。这种混合钢-GFRP混凝土系统可以作为加拿大、寒冷气候国家和受海洋盐水影响的沿海地区的结构和桥梁的耐腐蚀系统。