Abstract
Slender, load-bearing masonry walls with slenderness ratios (h/t) greater than 30 are required to be designed as pinned-pinned elements according to North American provisions for masonry, CSA S304-14 and TMS 402-16. This provision neglects the contribution of the reactive stiffness of the foundation to the strength of the wall and its effect on the redistribution of bending moments along its height. Eight full-scale masonry walls were built with different degrees of base stiffness and tested under an eccentric axial load. The results of the tests showed an increased load-bearing capacity and decreased deflections with increased rotational base stiffness. Experimental data were used to determine key design parameters, including the effective flexural rigidity and moment distribution along the height of the walls. Comparing the values of effective flexural rigidity determined from experimental results to code provisions, it was found that both codes tend to underestimate the effective flexural rigidity of the walls.
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