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1 2 3 4 5 6 7 8 8.06 Variable Load. Load not classified as permanent load. Web Crippling. The localized permanent (inelastic) deformation of the web member subjected to concentrated load or reaction at bearing supports. Webs. Members that join the top and bottom chords to form the triangular patterns that give truss action, usually carrying tension or compression stresses (no bending). Web Stiffener. Additional material that is attached to the web to strengthen the member against web crippling. Also called bearing or transverse stiffener. Yield Strength (Fy). Stress at which a material exhibits a specified limiting deviation from the proportionality of stress to strain as defined by ASTM. Z-Shape. A point-symmetric or non-symmetric section which is used as a chord member in a truss. * Terms shown with an asterisk are usually qualified by the type of load effect, for example, nominal tensile strength, available compressive strength, or design flexural strength. GLOSSARY Sources • AISC and AISI Standard Definitions for Use in the Design of Steel Structures, 2007 Edition • AISI S100-12: North American Specification for the Design of Cold-Formed Steel Structural Members; American Iron and Steel Institute; 2015 Addition • AISI-S240-15 Chapter A: AISI North American Standard for Cold-Formed Steel Framing - General Provisions; 2015 Edition. • AISI-S240-15 Chapter E: AISI Norh American Standard for Cold-Formed Steel Framing - Truss Design, 2007 Edition. • The Encyclopedia of Trusses, Alpine Engineered Products, Inc. Definitions presented in this Glossary were compiled and provided solely for the education of the reader. While every effort has been made to keep these definitions accurate, helpful and up-to-date, it is not the intent of this compilation to supplant existing or future regulatory or statutory definitions. ENGINEERED BY ALPINE R E F E R E N C E S / R E S O U R C E S