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1 2 3 4 5 6 7 8 ENGINEERING 4.01 Design Responsibilities The Committee on Framing Standards (COFS) of the American Iron and Steel Institute has created the Standard for Cold-Formed Steel Framing - Truss Design (latest revision is AISI-S240-15- Chapter E) to provide technical information and specifications on CFS truss construction. Specific design responsibilities are defined within the Standard in Section E2. While these definitions are not intended to replace any other allotments of responsibilities that may be agreed upon by involved parties, they do provide a proven framework for most projects. The responsibilities, as defined in the Standard, are given below: The Building Designer The Building Designer shall specify the following information: (a) design loads in accordance with Section E3 of the Standard (b) roof profile and geometry (c) bearing conditions (d) temperature and moisture environment for the intended end use (e) any special requirements or considerations to be taken into the truss design. The Building Designer shall provide for the following in the design and detailing of the building: (a) horizontal, vertical, or other truss deflection due to design loads (b) truss movement due to temperature changes (c) truss supports and anchorage accommodating horizontal, vertical or other reactions or displacements (d) permanent truss bracing to resist wind, seismic, and any other lateral forces acting perpendicular to the plane of the truss (e) permanent lateral bracing as specified by the truss designer. Truss Designer The Truss Designer shall make available, upon request, comprehensive design calculations including the following information: (a) loads and load combinations considered (b) axial forces, moments, and shears resulting from the applied loads and load combinations (c) design assumptions. Truss Design Drawings The truss design drawings shall include, as a minimum, the following information: (a) slope, depth, span, and spacing of the truss (b) bearing locations and minimum bearing lengths (c) design loading(s) (d) nominal reaction forces and direction (e) location of all truss connections (f) gusset plate locations, sizes and material specification (g) fastener type, size, quantities and locations (h) shape and material specification for each component (i) maximum nominal compressive force in all truss members (j) locations of required permanent truss member bracing (k) connection requirements for: (1) truss-to-truss girder (2) truss ply-to-ply (3) field assembly of trusses (l) calculated deflection ratio and / or maximum deflection for live and total load. Loading The loads and load combinations to be used in the design of cold-formed steel trusses shall be determined by the building designer as established by the local building code. In the absence of such a code, the loads, and combinations of loads shall be in accordance with accepted engineering practice for the geographical area under consideration as specified by the appropriate sections of ASCE 7. These and other reference materials are available from the American Iron and Steel Institute. See Section 8 of this Manual for contact information. ENGINEERED BY ALPINE E N G I N E E R I N G / S H O P D R AW I N G S