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This paper examines the behavior of structural sealant glazing joints loaded to failure. Experimental data are presented from a beam analog for a structural sealant glazed window edge. Analytical results are given for a typical structural sealant glazed unit. The characteristic, service load level, “double-hump” stress and elongation pattern along the glass edge was simulated by a tee-beam specimen with the stem and flange joined by a silicone bead. Point loads were used to produce a double-hump elongation pattern. The results clearly showed the ability of a structural sealant joint to redistribute stresses along its length when loaded to failure. A finite element analysis was made of stress redistribution along the edges of a structural sealant glazed unit under negative wind overloading, approximating a failure condition in the sealant joint. The model included a full stress range, combined tension and shear model for the joints and geometric nonlinearity in the glass. Transverse shear deformations of the joint, due to geometric nonlinearity, were found to have a significant effect on the tensile response of the joint. As a result, the extensive redistribution of tensile stresses seen in the tee-beam specimen did not develop. Instead, only a partial spreading of the double-hump pattern was seen. The implications of the research results are discussed.
structural sealant glazing, silicone, sealants, stress redistribution, ultimate strength
Professor, Michigan Technological University, Houghton, MI
Graduate Research Assistant, Michigan Technological University, Houghton, MI
Structural Engineer, Lockwood, Jones and Beals, Inc., Kettering, OH