By American Society of Civil Engineers
This commonplace presents a uniform foundation for the layout, detailing, fabrication, trying out, meeting, and erection of metal tubular buildings for electric transmission poles. those guidance observe to cold-formed unmarried- and multipole tubular metal buildings that help overhead transmission traces. The layout parameters are appropriate to guyed and self-supporting constructions utilizing various foundations, together with concrete caissons, metal piling, and direct embedment. general ASCE/SEI 48-11 replaces the former variation (ASCE/SEI 48-05) and revises a few formulation which are according to different present criteria. This typical incorporates a targeted remark and appendixes with explanatory and supplementary details. This common may be a major reference for structural engineers and building managers excited by designing and development electric transmission traces, in addition to engineers and others interested in the electrical energy transmission undefined.
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Additional info for Design of Steel Transmission Pole Structures (ASCE/SEI 48-11 Standard)
1. On multiple-leg structures, the assembled leg-length differential shall not exceed the practical adjustment length of the foundation system. 2 Erection. Erection of frame structures shall be in accordance with the Fabricator’s recommendations, including the use of temporary braces or members as required to prevent damaging or overstressing members and connections during the installation procedure. All slip joints shall be restrained to prevent separation of the joint during structure erection.
For fillet welds in holes and slots, the effective length shall be the length of the center line of the weld through the center of the plane through the throat. In the case of overlapping fillets, the effective area shall not exceed the nominal cross-sectional area of the hole or slot in the plane of the faying surface. The effective throat thickness of a fillet weld shall be the shortest distance from the root to the face of the diagrammatic weld. For fillets made by the submerged arc process, the TABLE 6-1.
7 Bearing Stress in Pinned Connections. 65 Fy dt (Eq. 2-10) where fbr = bearing stress; P = force transmitted by the pin; d = nominal diameter of the pin; t = member thickness; and Fy = specified minimum yield stress of the member. 8 Minimum Edge Distances for Pinned Connections. 9 Connection Elements and Members. 90( Fy ) (Eq. 2-9) where P = force transmitted by the bolt; Le = minimum edge distance, parallel to the load, from the center of the hole to the edge of the member; d = nominal diameter of the bolt; t = member thickness; Fu = specified minimum tensile stress of the member; Lc = minimum clear distance, parallel to load, from the edge of the hole to the edge of an adjacent hole or edge of the member; and s = minimum center-to-center spacing between bolts.