Abstract
A composite masonry wall consists of a wythe of brick and another wythe of concrete block. The cavity between the two wythes is grouted and the wall acts as a single unit. In such construction, the floor slab usually rests on the interior (block) wythe, and directly transmits vertical and horizontal in-plane loads. A percentage of these loads is transferred to the outer brick wythe through shear stresses in the collar joint. The research to correctly estimate these shear stresses was carried out by the writer at Clemson University through grants from the National Science Foundation, and has resulted in defining the allowable shear stress values in the collar joints of composite walls for the design community. These values have been published in `Building Code Requirements for Masonry Structures,' ACI 530-92/ASCE 5-92/TMS 402-92, and Commentary. Many of the writer's published works have been cited on p. CC-17 of the Commentary. Improvements in the Code values are further possible by incorporation of some of the other findings from this research. The author is working with the Code committees to have this become a reality.
Published Version
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