Use of Computers in Transmission Tower Design

by David L.C. Lo, Formerly, Sr. Engrg. Analyst, Sargent & Lundy, Chicago, Ill.,
Surendra K. Goel, (M.ASCE), Supervisor; Sargent & Lundy, Chicago, Ill.,
Andrew Morcos, (M.ASCE), Struct. Project Engr.; Sargent & Lundy, Chicago, Ill.,

Serial Information: Journal of the Structural Division, 1975, Vol. 101, Issue 7, Pg. 1443-1453

Document Type: Journal Paper

Abstract: A computer program for the design and analysis of steel transmission towers or general trusses is presented. Successive iterations between analysis and design, with a tolerance controlled by the designer, are performed within the program to achieve convergence to the final solution. The program capabilities consist of: (1) Generating symmetric portions of geometry; (2) identifying and stabilizing planar (unbraced) nodes; (3) handling tension only members; (4) accounting for the buckling of members by using a bilinear force-displacement relationship; and (5) varying some key nodes to optimize the tower geometry. The redistribution of force due to buckling is achieved by modifying the force matrix only. The buckling and post-buckling behavior is similar to the actual behavior of such members in the transmission towers. The frontal equation solver with an automatic numbering skill has made the program more efficient.

Subject Headings: Power transmission | Power transmission towers | Buckling | Geometrics | Structural behavior | Computer analysis | Computer software | Steel |

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