Calculate Lifting Capacity for Spreader Bar

  • Thread starter Thread starter Brian Simpson
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SUMMARY

The discussion focuses on calculating the lifting capacity of a spreader bar, emphasizing the importance of load direction on the four bottom edge holes. Three potential failure modes are identified: pull-out from the top hole, pull-out from the bottom holes, and bending of the plate about the mid-line due to compression. To enhance structural integrity, it is recommended to weld a flat along the bottom edge to prevent folding under load.

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Brian Simpson
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Can some one help me figure lifting capacity for this spreader bar?

Thanks
 

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You have not specified the direction of the loads applied to the four bottom edge holes.
I see three potential modes of failure.
1. The top hole pulls out.
2. The bottom holes pull out. This will depend on the direction of the loads suspended from the bottom holes.
3. The plate may bend about the mid-line, through the top hole, due to compression in the lower edge. Again it is dependent on the load direction. Maybe you would benefit by welding a flat along most of the bottom edge to keep it straight and prevent the plate folding.
 

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