Allowable Deflection of a Cantilevered Beam

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SUMMARY

The allowable deflection for a cantilevered beam is crucial for ensuring structural integrity and preventing plastic deformation. A commonly accepted guideline is that the maximum deflection should not exceed 1 inch for every 250 inches of beam length. This estimation is based on standard engineering practices and can be verified through construction codes such as ACI. For accurate calculations, methods like the double integration method are recommended for elastic materials like steel, while concrete requires more complex analysis.

PREREQUISITES
  • Understanding of cantilever beam mechanics
  • Familiarity with deflection calculations
  • Knowledge of construction codes, specifically ACI
  • Proficiency in the double integration method for beam analysis
NEXT STEPS
  • Research the double integration method for calculating beam deflection
  • Study ACI construction codes related to allowable deflection
  • Explore material properties of steel and concrete in structural design
  • Investigate alternative methods for analyzing deflection in cantilever beams
USEFUL FOR

Structural engineers, civil engineers, and students studying beam mechanics will benefit from this discussion, particularly those involved in designing cantilevered structures and ensuring compliance with deflection standards.

CWIL
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I am struggling to remember how to determine the allowable delta max for a beam.

I am currently modeling the bending forces upon a piece of square tubing, and though developing delta max seems rather straight forward, I can not seem to remeber how to determine just how much deflection I am allowed in that beam.

Essentially... I have my delta max, but how do I know if that much deflection is OK in my design (failure due to Plastic Deformation)

Any input is appreciated

I have seen on another PF thread that 1" of deflection per every 250" of beam is an accepted approach. Is this accurate? What is the basis behind this estimation?

Thanks
 
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Well if the beam is supposed to act in an elastic way like steel you can easily use the double integration method. If it's made out of concrete it will be a bit more complicated. If you want further information just ask again and I will reply.
 
Wait I think I got you wrong, you want to know the allowable deflection? You can find it in the construction codes like ACI.
 

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