Download Design of Steel Transmission Pole Structures (ASCE/SEI 48-11 by American Society of Civil Engineers PDF

By American Society of Civil Engineers

This normal offers a uniform foundation for the layout, detailing, fabrication, checking out, meeting, and erection of metal tubular constructions for electric transmission poles. those directions observe to cold-formed unmarried- and multipole tubular metal constructions that help overhead transmission traces. The layout parameters are acceptable to guyed and self-supporting constructions utilizing a number of foundations, together with concrete caissons, metal piling, and direct embedment. ordinary 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 common features a unique statement and appendixes with explanatory and supplementary info. This ordinary can be a chief reference for structural engineers and development managers taken with designing and development electric transmission strains, in addition to engineers and others serious about the electrical strength transmission undefined.

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Additional resources for Design of Steel Transmission Pole Structures (ASCE/SEI 48-11 Standard)

Example text

Deflection readings shall be made for the “before” and “off” load conditions as well as at each intermediate hold during loading. All deflections shall be referenced to common base readings taken before the first test loads are applied. 5 Load Measurement Failures The Owner shall specify if any special strain determination methods are required for the prototype and identify those components to be strain gauged. When failure occurs before application of 100% of the factored design loads, the cause of the failure, the corrective measures to be taken, and the need for a retest shall be determined by the Structure Designer and approved by the Owner.

1). 9 Loading Procedure The Owner shall specify in the contract documents which structures or components of a structure will be tested. If a proof test of a structure or structure component is specified, the test shall be performed on a full-size prototype of the structure or structure component in accordance with the following sections. The sequence of load cases tested shall be specified by the Structure Designer and approved by the Owner. Loading shall be stopped at preselected load levels to allow time for reading deflections and to permit observation of the test to check for signs of structural distress.

The determination of the shaft-to-shaft connection is normally based on the type and magnitude of structure loading. Shafts loaded in bending or compression are normally designed using a slip joint connection, whereas shafts loaded in uplift, or guyed structures with axial loads greater than the Structure Designer’s recommended jacking force, normally use a bolted flange connection. The type of foundation is usually based on economic factors influenced by geotechnical conditions, construction material costs, and structure loads.

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