Novel structural systems and materials for concrete construction

拟议的研究计划旨在推进混凝土施工。这项研究的结果将对未来混凝土基础设施的安全性、耐久性和可施工性产生影响。结构混凝土是世界上使用最多的建筑材料，考虑到大多数人的大部分时间和日常活动都是在建筑环境中度过的，在大多数国家和加拿大，基础设施至少占GDP的3.5%是合乎逻辑的。因此，研究功能齐全、节能安全的基础设施具有重要的战略意义。 这项研究涉及重力和地震荷载下混凝土构件的设计，地震区柱上支撑的混凝土平板加固的新概念，纤维增强塑料(FRP)筋加固的混凝土构件，FRP筋的试验方案，以及用于地震应用的混凝土框架的新型混合体系。将进行实验室测试、理论和数值研究，为新一代工程师提供极好的培训机会。 混凝土板的研究将集中在新型冲切加固系统，该系统提供延性并允许地震时的能量耗散。将开发特殊的柔性剪切加固方案。在大规模实验室测试之后，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。 玻璃钢(GFRP)钢筋在混凝土中的应用主要是由钢筋腐蚀问题推动的。GFRP筋很坚固但很脆，因此GFRP加固的混凝土构件的行为与传统的钢筋加固构件不同；它们依赖混凝土来提供延性。将进行非线性有限元研究和采用压杆-拉杆方法的GFRP加固混凝土的力学模型。将研究材料测试方案，以简化测试，为钢筋质量评估提供实用手段。非破坏性耐久性评估将与机械长期测试相关联。 GFRP筋的抗震应用将在一种创新的概念中进行研究，即在地震区的混凝土框架建筑中创建预定的铰链的钢-GFRP混合截面。这一概念已在理论上进行了探讨，并显示出很大的实用潜力。一项实验室测试计划将包括采用不同配置的钢和GFRP筋的连续混杂混凝土梁。 将研究利用纤维混凝土(FRC)和玻璃纤维增强材料(GFRP)建立耐腐蚀和延性混凝土板柱连接的可能性。这种混合钢-玻璃钢混凝土系统可在加拿大、寒冷气候国家和受海洋咸水影响的沿海地区用作结构和桥梁的防腐系统。

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 steelGFRP 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.