Guidelines for Electrical Transmission Line Structural by C. Jerry Wong, editor, Michael D. Miller

By C. Jerry Wong, editor, Michael D. Miller

The knowledge of transmission line structural so much keeps to enhance because of study, trying out, and box adventure. guidance for electric Transmission Line Structural Loading, 3rd variation presents the main appropriate and up to date info regarding structural line loading. up-to-date and revised, this variation covers weather-related so much, relative reliability-based layout, and loading specifics utilized to avoid cascading different types of disasters, in addition to rather a lot to guard opposed to harm and damage in the course of development and upkeep. This guide is meant to be a source that may be comfortably absorbed right into a loading coverage. it is going to be important to engineers excited about software, electric, and structural engineering

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This method is also applicable to guyed Vs and other guyed structures (ASCE 1997a). 42 ELECTRICAL TRANSMISSION LINE STRUCTURAL LOADING For separated latticed truss systems and individual tubular shaft members of an H-frame structure, the windward faces should be considered as each being individually exposed to the calculated wind force determined from Eq. 2-1a or 2-1b with the appropriate force coefficients. The wind forces can then be distributed to the structure panel points according to the criteria specified by the utility.

For components of steel towers and steel or prestressed concrete pole structures designed according to the ASCE and Precast/Prestressed Concrete Institute (PCI) publications (ASCE 1988; ASCE 1990a; PCI 1997), it can be assumed that Rn (or Re) has an exclusion limit in the range of 5% to 10% and COVR is in the range of 10% to 20%. 0. 2. Reinforced Concrete. For reinforced (non-prestressed) concrete components designed according to the ACI-318 procedures (ACI 2002), the ACI strength reduction factors can be used in lieu of the φ factors given in Table 1-3 because the ACI factors already contain strengthderating effects for the various concrete components.

The Exposure D category applies to structures directly exposed to bodies of water and coastal beaches. Exposure D extends inland from the shoreline a distance of 1,500 feet or 10 times the height of the structure, whichever is greater. 2 Equations. Values of the velocity pressure exposure coefficient, Kz are given by Eq. 2-3. 01 ⎜ h ⎟ ⎝ zg ⎠ for 33 ≤ z h ≤ zg (2-3) The velocity pressure exposure coefficient, as defined in Eq. 2-3, is dependent on effective height, zh; the gradient height, zg; and the power Figure 2-2.

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