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Introduction to Truss Loading Course Workbook

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Loading Class Manual for intelliVIEW – Chapter 1 Definitions Live Load - Loads which are not from the weight of things permanently attached to the building such as; wind, snow, seismic, construction, and occupancy loads. Dead Load - The weight of the structure or building itself is considered dead load. Examples include the permanently applied loads from purlins, sheathing, roofing and ceiling materials, and the weight of the truss itself. Since material weights are normally expressed on a pounds- per-square foot basis, dead loads for sloped surfaces must be adjusted for the pitch of the chord member. Uniform Load - A load that is equally distributed over a given length or area and is expressed in pounds per lineal foot (plf) or pounds per square foot (psf). Triangular Load - A type of uniform load that increases or decreases at a steady rate along a given length. Loads applied to a hip jack or loads resulting from snow drifting would be considered a triangular load. These loads typically have either a starting or ending magnitude of zero. Concentrated or Point Load - Loads of a specific magnitude located at specific location. The load resulting from a beam attached to the bottom chord of Truss would be an example of a concentrated load. Unbalanced Load - This term refers to the removal of load from a portion of the truss. An unbalanced snow load check would analyze the truss with the live load removed or reduced from a section of the truss, typically one side of the peak. Attic Trusses are an example of a truss that is sensitive to unbalanced loading because they have an area without webbing triangulation and as such require an unbalanced load check. The unbalanced loads are generated by intelliVIEW automatically. Floor Trusses with interior bearings, cantilevers, or balconies also require unbalanced load checks. These loads are automatically generated by intelliVIEW.

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