6a On ColdFormed Steel Construction（冷弯钢结构6）.pdf

TECHNICAL NOTE $5.00 6a On Cold-Formed Steel Construction 1996 Light Gauge Steel Engineers Association • Washington, D.C. • Toll-Free: 1 (866) 465-4732 • www.LGSEA.com SCREW FASTENER SELECTION FOR LIGHT GAUGE STEEL FRAME CONSTRUCTION Summary: Specifying the proper fastener is necessary to assure the proper performance of the connec- tions used in light gauge (cold formed) steel construction. Connections in traditional wood construction rely on the embedment of nails to provide shear and tensile strength. Since cold formed steel connections prima- rily are made with externally threaded fasteners, there is no embedment to consider. Instead, the design of the fastener along with the thickness of the steel govern the value of the connection. This Tech Note is the first in a series on fasteners, and is designed to provide the basic information used in determining the appropriate screw type for various applications. Other issues in this series will discuss specific applications. Definitions: Tapping screws are externally threaded fas- tion is multiple thicknesses of 33 mils (20 gauge) steel or teners with the ability to “tap” their own internal mating thicker. threads when driven into metallic and non-metallic materi- 2. Self-Piercing Screws are externally threaded fasteners als. Cold formed steel construction utilizes two specific types with the ability to self-pierce metallic ma- of tapping screws: