What Materials are Best for Building a 50 Kip Capacity 'A' Frame Crane?

AI Thread Summary
For constructing a stationary 'A' frame crane with a 50 Kip capacity, using W12 x 45 steel I-beams for the boom poles is recommended, as they can support a lifting capacity of 27,220 kg. It is crucial to incorporate four K braces evenly spaced along the boom for adequate stability, rather than relying on a single brace. The design includes a fixed radius of 15 ft, a boom height of 60 ft, and a head width of 34 inches. Additionally, the crane will utilize back stays with 1-inch cables approximately 70 ft behind the main legs, anchored to embedded concrete weights. Proper material selection and structural support are essential for achieving the desired lifting capacity and stability.
tradewind
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Gentlemen,

I am needing help choosing the correct materials to construct a stationary 'A' frame crane with a fixed radius of 15ft, back stayed with 2-1" cables approx. 70ft behind main non-rotational boom legs attached to embedded concrete weights, height of boom is 60 ft with pendants connected at the tip, supporting a 4-15" head sheave arrangement,a 'K' brace would be used approx. 15 ft down from tip, head width pendant to pendant of 34" and boom feet spread 10 ft on center. Approx. lifting capacity of at least 50 Kips or more.

Thanks for any input
 
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tradewind: For each of the two boom poles in your A-frame, it currently appears an imperial W12 x 45 steel I-beam would work, and would give a lifting capacity of 27 220 kg. But you must use four K braces, evenly spaced, not just one.

I did not check your support cable diameter. Maybe some other time.
 

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