Durability and Protection of Infrastructure

纤维增强聚合物（FRP）越来越多地被用作混凝土结构中易受钢筋腐蚀的钢筋的替代物，但FRP加固构件的安全和经济设计需要了解其在不同应力场下的使用性能和强度。目前，对FRP加固混凝土构件同时承受剪切、轴向荷载和弯曲，或剪切、扭转和弯曲的承载能力的了解还很少。为了填补这一空白，在拟议的研究的行为和FRP加固混凝土构件在联合行动下的强度将进行调查。将对用玻璃或碳纤维增强塑料筋加固的全尺寸梁/柱进行物理试验，以确定其在同时承受不同水平的剪切、扭转和弯曲或弯曲、轴向压缩和剪切时的完整性能、破坏模式和极限承载力。基于混凝土和FRP的适当本构关系以及它们的粘结性能，将为此类构件的设计开发稳健的、实用的、合理的模型，并将这些模型提交给CSA标准S806，以便可能纳入新版标准。基于软化桁架模型和修正的压缩场理论的模型将被用作起点。

Fibre Reinforced Polymers (FRP) are increasingly used as substitute for steel reinforcement in concrete structures susceptible to reinforcement corrosion, but the safe and economical design of FRP reinforced members requires knowledge of their serviceability and strength under different stress fields. Currently, there is paucity of knowledge about the load carrying capacity of FRP reinforced concrete members subjected concurrently to shear, axial load, and bending, or, to shear, torsion and bending. To fill this gap, in the proposed research the behaviour and strength of FRP reinforced concrete members under combined actions will be investigated. Physical tests will be conducted on full scale beams/columns reinforced with glass or carbon FRP bars to determine their complete behaviour, mode of failure and ultimate capacity when concurrently subjected to different levels of shear, torsion and bending or to bending, axial compression and shear. Based on the appropriate constitutive laws of concrete and FRP, as well as their bond behaviour, robust, albeit practical, rational models will be developed for the design of such members and the models will be submitted to the CSA Standard S806 for possible inclusion in the new edition of the standard. Models based on the Softened Truss Model and the Modified Compression Field Theory will be used as the starting point.