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Tower and Antenna Wind Loading as a Function of Height

July/Aug 2001 23Do you want to determine the maximum safe Height ofyour freestanding Tower for any Antenna configuration as a Function of wind velocity? Use this approach to writea simple spreadsheet that will do the calculations in amatter of seconds and check the mast stress at the same Frank Travanty, W9 JCC808 Pendleton CtWaukesha, WI and AntennaWind Loading as aFunction of Height [Author s disclaimer: No liability isassumed for use of these calculationsthat results in bodily injury or propertyloss. If there are any questions or con-cerns regarding safety, they should bereferred to the manufacturer of yourtower.]After having a 54-foot, freestandingcrank-up Tower with a TH6 DXX beamup for 29 years in three differentstates, the wind finally blew hardenough to bend the lower portion of thetower.

lation compared to the design limit. With a 133-MHz personal computer, the calculation for any single table entry is complete in less than about 0.5 s. Three or four iterations will usu-ally get you close enough to the target bending moment. In this example, the target bending moment is 19,600 ft-lb. The entire table and chart can be com-

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