Novel structural systems and materials for concrete construction

提出的研究计划旨在推进混凝土建设。本研究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%，这是合乎逻辑的。因此，研究功能性、节能性和安全性的基础设施具有重要的战略意义。本研究涉及在重力和地震荷载下的混凝土构件设计，在震区柱上支撑的钢筋混凝土平板的新概念，使用纤维增强塑料（FRP）增强的混凝土构件，FRP筋的测试协议，以及用于地震应用的混凝土框架的新型混合系统。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型冲剪加固系统上，该系统提供延性并允许地震时的能量耗散。开发专用柔性剪切补强液。大规模的实验室测试将随后进行有限元分析（FEA）和参数化研究，以扩展实验结果并允许提出设计方法。玻璃钢（GFRP）在混凝土中的应用主要是由钢筋的腐蚀问题驱动的。GFRP筋强度大但脆性大，因此GFRP加固混凝土构件的性能与传统钢筋构件不同；它们依靠混凝土来提供延展性。本文将采用杆系法对GFRP钢筋混凝土进行非线性有限元分析和力学建模。研究材料测试方案，简化测试过程，为棒材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筋在地震中的应用将以混合钢-GFRP截面的创新概念进行研究，以在地震带的混凝土框架建筑中创建预定铰链。这一概念已得到理论研究，并显示出巨大的应用潜力。一个实验室测试程序计划包括连续混合混凝土梁与各种安排的钢和玻璃钢增强。将研究使用纤维增强混凝土（FRC）和GFRP增强材料的可能性，以创建抗腐蚀和延展性的混凝土板-柱连接。这种钢-玻璃钢混合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抗腐蚀系统。

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 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.