Analysis of Four-legged Tower for Dynamic Loads

by David P. Billington,
William S. Gaither,
Alan M. Ebner,

Serial Information: Journal of the Engineering Mechanics Division, 1966, Vol. 92, Issue 2, Pg. 61-74

Document Type: Journal Paper


An analysis, applicable to wind-loaded tower structures and wave-loaded off-shore platforms, is presented. First a mathematical analysis, which considers time dependent loadings, a large number of degrees of freedom and internal and external damping, is formulated to determine resonant frequencies along with the corresponding peak forces and displacements. Second a physical model analysis for a specific tower structure is carried out to confirm and extend the results from the mathematical model. A welded four-legged steel tower, 36-in. high is externally loaded by an electro-magnetic shaker. Resonant frequencies are determined by a force gage and visual observations with stroboscopic light.

Subject Headings: Dynamic loads | Dynamic analysis | Structural analysis | Mathematics | Load factors | Resonance | Mathematical models | Physical models

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