Design 3 Cable System for 25m Radio Tower: R, Diam of Steel Cables

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SUMMARY

The discussion focuses on designing a three-cable support system for a 25-meter radio tower, specifying the radius R of the supports at points B, C, and D, and the diameter of the steel cables. The supports are positioned at equal radial distances from the base, with angles of 120 degrees between them. The cables must withstand a maximum horizontal storm force of 18 kN, with one cable remaining slack depending on the storm force's direction. The analysis includes evaluating the impact of varying R values on cable load distribution and identifying orientations of the storm force that result in maximum cable tension.

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mrdad123
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Design the three cable support system for a radio tower of height 25 m. This includes specifying the radius R of the supports at point B, C, and D (as measured from the base of the tower) and the diameter of the steel cable.

Remarks:
- All supports will be erected on a horizontal surface.
- All three cables meet at point A on the top of the tower.
- Supports B, C, and D will each be located at the same radial distance R from the base of the tower (point O) such that angle BOC = angle BOD = angle COD = 120 degrees.
- The cables must be able to support a maximum horizontal storm force F = 18kN from any direction in the horizontal plane.
- Neglect the weight of the cables in your calculations.
- Assume one of the cables is always slack and supports no load. For example, when force F lies in sector CAD, cable AB is slack.

Describe the merits of large versus small values of R and why you selected the value. State which orientations of the storm force F lead to the most severe cable loads and how you determined these orientations.
 
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Welcome Mrdad.

If that is your homework, how far have you got?

What forces, for instance, do you think the support cables are resisting and how therefore would you arrrange them?
 

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