Effect of Bond Beams on Stack Pattern Concrete Masonry Walls and an Investigation of Interfacial Interaction of Cut Prisms
Date of Award
Civil and Environmental Engineering
Interfacial interaction, Masonry prism, Masonry walls, Out-of-plane bending, Stack pattern construction, Strain contours
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This thesis presents the experimental results of laboratory testing of full-scale masonry walls constructed in stack pattern and masonry prisms constructed using running bond and stack pattern using different block size and block strengths. The first study investigated the effect of bond beams on behaviour and strength when included in loadbearing stack pattern masonry wall construction. The results were compared with previous tests completed at the University of Windsor of comparable of running bond and stack pattern walls in terms of size and reinforcement. It was found that bond beams increased lateral load and bend bending moment capacity by 18% and 13% respectively at ultimate out-of-plane load compared to stack pattern walls without bond beams. Additionally, stack pattern walls with bond beams outperformed running bond walls by 7% and 6% for lateral load and bending moment respectively at the same point mentioned above. Bond beams also influenced crack formation and allowed for more distribution of cracks at bed joint locations. The second study investigated the interfacial interaction of high strength cut prism specimens. This study used digital image correlation to create strain contours and strain concentrations to track interaction between construction materials (block, mortar, and grout). Longitudinal and lateral strain was investigated. It was found that longitudinal strain concentrations appeared at mortar bed joint at approximately 30% of maximum load at the interface of block units and mortar. Additionally, lateral strain caused by the Poisson’s effect generally appeared at 60 to 80% of maximum load depending on what material surface was considered. Lateral strain concentrations were observed primarily between the block (webs and face shell) and grout. Cracks at lateral strain concentrations were measured and found to be consistent within comparable specimen groups.
Dirks, Jonathan David, "Effect of Bond Beams on Stack Pattern Concrete Masonry Walls and an Investigation of Interfacial Interaction of Cut Prisms" (2023). Electronic Theses and Dissertations. 9081.