TrusSteel - Cold Formed Steel Trusses

1 2 3 4 5 6 7 8 8.04 GLOSSARY Heel Point on a truss at which the top chord and bottom chord intersect at the end of a truss with a sloping top chord. Hip-Set A sloped roof surface that extends from a roof ridge towards the eave. Installation Drawings Drawings that show the location and installation of the cold-formed steel structural framing. Installer Party responsible for the installation of cold-formed steel products. Joint Area where two or more ends, surfaces, or edges are attached. Categorized by type of fastener or weld used and the method of force transfer. Lateral Forces Non-gravity forces acting on a building such as wind and seismic. Lateral Force Resisting System The structural elements and connections required to resist racking and overturning due to wind and/or seismic forces imposed upon the structure in accordance with the applicable building code. Lateral Load A horizontal force created by wind or earthquake that acts on a structure or its components. Level Return Filler placed horizontally from the end of an overhang back to the bearing support to form soffit framing. Live Loads Live loads are transient and sustained loads usually created by people and furnishing, respectively. Load Force or other action that results from the weight of building materials, occupants and their possessions, environmental effects, differential movement, or restrained dimensional changes. Load Effect Forces, stresses, and deformations produced in a structural component by the applied loads. Load Factor Factor that accounts for deviations of the nominal load from the actual load, for uncertainties in the analysis that transforms the load into a load effect, and for the probability that more than one extreme load will occur simultaneously. LRFD (Load and Resistance Factor Design) Method of proportioning structural components such that the design strength equals or exceeds the required strength of the component under the action of the LRFD load combinations. LRFD Load Combination Load combination in the applicable building code intended for strength design (Load and Resistance Factor Design). Material Supplier An individual or entity responsible for furnishing framing materials for the project. Mil A unit of measurement used in measuring the thickness of thin steel elements. One mil equals 1/1000 of an inch (e.g., 33 mil = 0.033 inch). Moment Frame Framing system that provides resistance to lateral loads and provides stability to the structural system primarily by shear and flexure of the framing members and their connections. Multi-Node Analysis A truss analysis methodology when each individual web member at a joint is modeled with its own node. Multiple Span The span made by a continuous member with intermediate supports. Nominal Load Magnitude of the load specified by the applicable building code. Nominal Strength* Strength of a structure or component (without the resistance factor or safety factor applied) to resist the load effects, as determined in accordance with a Specification or Standard. Overhang The extension of the top or bottom chord of a truss beyond the bearing support. Panel In a truss, the chord segment defined by two successive joints. Panel Length The centerline distance between joints measured horizontally. Panel Point The connection region between a web and chord member. Peak Point on a truss where two sloped chords meet. Permanent Load Load in which variations over time are rare or of small magnitude. All other loads are variable loads. Piggyback Truss. A truss supported directly on top of another truss. Trusses are piggybacked due to height restrictions in fabrication and delivery. Pitch See Slope. Pitch Break A location around the perimeter of a truss where the chord changes pitch. Plans Drawings prepared by the design professional for the owner of the project. These drawings include but are not limited to floor plans, framing plans, elevations, sections, details and schedules as necessary to define the desired construction. Purlin Horizontal structural member that supports roof deck and is primarily subjected to bending under vertical loads such as snow, wind or dead loads. (May also brace the top chord of trusses in certain applications, resulting in an applied axial force). Rake The inclined edge of a roof. Rake Overhang The horizontal projection of the roof measured from the outside face of a gable endwall to the outside edge of the roof. Rational Engineering Analysis Analysis based on theory that is appropriate for the situation, relevant test data if available, and sound engineering judgment. Reaction Forces acting on a truss through its supports which are equal (but opposite) to the sum of the dead and live loads. Release for Construction The release by the owner's representative, permitting the component manufacturer and/or installer to commence work under the contract, including ordering framing material and preparing ENGINEERED BY ALPINE R E F E R E N C E S / R E S O U R C E S

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