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Screw-Chase Pull-Out Strength: Old and New Design Equations


Product Information

•    Title:  Screw-Chase Pull-Out Strength: Old and New Design Equations

•    Author:  James C. LaBelle, Tanya A. Dolby

•    Author Company:  CSD Structural Engineers, Kawneer Company

•    Volume:  Vol. 77, No. 2

•    Year:  2019

•    No. Pages:  2.75

•    Description:  Recent developments, including testing and analysis, have resulted in an increased understanding of the pull-out strength of screws installed in screw chases in aluminum extrusions. One pull-out strength design method (known as the “A-T” equation) has been in use in the curtain wall industry. It utilizes the relevant pull-out equation, from among those for tapped holes in the Aluminum Design Manual (ADM). Recent testing has revealed a compelling need for an improved approach to better predict pull-out strengths. This article compares test results to corresponding predicted values using the A-T equation and presents an improved equation, which will be published in the updated ADM in 2020.

•    Companies Mentioned:  American Architectural Manufacturers Association

Product Code: SCRI266C23


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