T&D World Magazine
Structures supplement DiGioia Gray  Associates LLC

This structure is a good example of a running angle with a bridge crossing were structure deflections could impact clearance.

Structure Flexibility Affects Line Clearance

Deflections in the structure-foundation system can place wires in unintended locations.

Self-supporting steel monopoles with concrete drilled-shaft foundations continue to be a popular choice for the installation of new transmission structures for voltages up to and including 500 kV. A design of these structures that is based principally on strength can result in flexible structures that endure large deflections under various climatic loading conditions.

Large structural deflections can have a significant impact on the transmission line system. These deflections ca

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