09-04-2010, 09:03 AM
Theoretical Effective Length Factors for Cross-Braced Solid Round Diagonals
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The objective of the investigation is to determine theoretically the effective
length factors of cross-braced solid round diagonals in all-welded steel
communication towers. Three beam-column models with different boundary
conditions (pinned, elastically restraked, and fixed) were investigated and it was
show that a beam-column with elastic restraints at ends and at cross-brace
location is the most accurate. However, for design purposes, when the ratio of
the diameter of the leg to the diameter of the diagonal exceeds three, beam-column
mode1 with fixed ends and elastic restraint at cross-brace location is
satisfactory. The theoretical results were compared with results of tests on 26
specimens.
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