Browsing by Author "Rizaee, Samira"

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    Assessing Bond Beam Horizontal Reinforcement Efficacy with Different End Anchorage Conditions in Concrete Block Masonry Shear Walls
    (2015-07-30) Rizaee, Samira; Lissel, Shelley
    Reinforced concrete block shear walls are studied in this research. The main focus is to determine how the end anchorage conditions of bond beam horizontal reinforcement influences the behaviour of shear walls, and how to use reinforcement to improve shear wall performance by using smaller bar sizes and by relocating the bond beams. Characteristics defining the behaviour of walls, including crack pattern, lateral strength, ductility, effective stiffness, stiffness degradation, and energy dissipation are studied. The reinforcement strain recorded at strategically strain gauged locations revealed that neither the end anchorage conditions nor the smaller bar size increased the likelihood that the bars would yield at these locations. Statistical analyses were conducted to compare different groups of walls. It was concluded that the end anchorage conditions do not have significant benefit on the mentioned behaviour characteristics. In addition, relocation of the horizontal rebar is only beneficial in the case of smaller diameter bars.
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    Bond Strength of Adhered Manufactured Thin Stone/Brick Masonry Veneer Units to Setting Bed Mortar at Different Temperatures and Different Cycles of Freeze-Thaw
    (2021-05-14) Rizaee, Samira; Shrive, Nigel; Duncan, Neil; Khoshnazar, Rahil; Husein, Maen; Feldman, Lisa
    Close to no study has been conducted to identify the possible influential physical and mechanical characteristics of adhered thin masonry units and mortars on the bond strength in adhered thin masonry veneer (ATMV) applications. There have been numerous cases of bond failures in ATMV applications probably due to lack of knowledge and the lack of any standards for the design and installation of ATMV. In the Canadian climate, exposure to extreme weather conditions like very low temperatures and freeze-thaw cycles are common and may be a cause of bond deterioration and failures. Therefore, it is important to study the effects of exposure to extreme weather conditions on the bond strength. This research first measures and evaluates the physical and mechanical properties of thin masonry units and mortars. Then shear and tensile bond strengths are studied considering different age and environmental factors. At least three different ages, two different curing temperatures, three testing temperatures and four cycles of freeze-thaw were considered. Subsequently, any possible relationship between these characteristics and bond strengths were evaluated and proper practices were recommended.