By American Society of Civil Engineers
This regular presents a uniform foundation for the layout, detailing, fabrication, checking out, meeting, and erection of metal tubular constructions for electric transmission poles. those instructions observe to cold-formed unmarried- and multipole tubular metal buildings that aid overhead transmission strains. The layout parameters are appropriate to guyed and self-supporting constructions utilizing a number of foundations, together with concrete caissons, metal piling, and direct embedment. usual ASCE/SEI 48-11 replaces the former version (ASCE/SEI 48-05) and revises a few formulation which are in keeping with different present criteria. This ordinary contains a unique remark and appendixes with explanatory and supplementary details. This normal may be a chief reference for structural engineers and building managers serious about designing and development electric transmission traces, in addition to engineers and others concerned with the electrical energy transmission undefined.
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Additional info for Design of Steel Transmission Pole Structures (ASCE/SEI 48-11 Standard)
Any positive indications after this inspection shall be repaired and reinspected, and the finish shall be repaired in accordance with the requirements of the appropriate ASTM standard. This requirement may be waived if the Fabricator can demonstrate through study and quality assurance records that it can control its material, forming, welding, and galvanizing processes to the degree that such continued inspection is unnecessary. 6 Shipment and Storage. The quality control program shall provide procedures that will prevent damage, loss, or deterioration to the structure during storage and shipment.
5 Weld Inspection. Quality control supervisory personnel shall be certified welding inspectors (CWIs) in accordance with 23 the provisions of AWS QCI. 1. 1. Complete penetration welds shall be 100% inspected by either ultrasonic (UT) or radiographic (RT) methods. Appropriate inspection practices shall be used to ensure that required penetration is achieved. , ultrasonic nondestructive weld testing shall be performed on 100% of all such joints, not only before, but also after galvanizing to ensure that no cracks have 24 developed.
2 Shear Stress in Bearing Connections. The shear stress for bolts and pins shall not exceed the following: V ≤ Fv Ag (Eq. 3 Bolts Subject to Tension. Bolts shall be proportioned so that the sum of the tensile stresses caused by the applied external load and any tensile stress resulting from prying action does not exceed the permitted tensile stress, Ft, as follows: Ts = Ft As (Eq. 75 Fu. 9382 p )2 4 (Eq. 2-3) where Ts = bolt tensile force; d = nominal diameter of the bolt; n = number of threads per inch, and p = pitch, mm per thread.
Design of Steel Transmission Pole Structures (ASCE/SEI 48-11 Standard) by American Society of Civil Engineers