Shear Effects in Design of Guyed Towers

by Robert A. Williamson,
M. N. Margolin,


Serial Information: Journal of the Structural Division, 1966, Vol. 92, Issue 5, Pg. 213-236


Document Type: Journal Paper

Abstract: Shear distortion associated with deformations of trussed web systems in guyed towers can be sufficiently important to warrant consideration in design. Shear distortion reduces the stiffness of the tower shaft. If this reduction is ignored, and axial thrust is negligible, the resulting moments and shears are usually overstated; when axial thrust is sufficiently large to cause significant beam-column effects, the reverse is true. The shear effect is expressed by a shear-flexure parameter. Equations are derived for modifying the elastic constant, i.e., (stiffness and cary-over factors and fixed-end moments) used in the various techniques which evaluate end moments by release of restraints. Expressions are also given for evaluating in-span bending moments and shears. Results are given in chart form for special design use, and numerical examples are presented.

Subject Headings: Guyed towers | Distortion (structural) | Stiffening | Thrust | Moment (mechanics) | Shear deformation | Trusses

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