Allowable Deflection of a Cantilevered Beam

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    Beam Deflection
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Discussion Overview

The discussion revolves around determining the allowable deflection (delta max) for a cantilevered beam, specifically focusing on the implications of deflection in design and the potential for failure due to plastic deformation. Participants explore methods for calculating allowable deflection and reference construction codes.

Discussion Character

  • Technical explanation
  • Homework-related
  • Debate/contested

Main Points Raised

  • One participant expresses uncertainty about how to determine the allowable deflection for a beam and seeks input on the topic.
  • Another participant suggests using the double integration method for elastic materials like steel, while noting that concrete would require a more complex approach.
  • A different participant mentions that allowable deflection can be found in construction codes, specifically referencing ACI.
  • There is a reference to an accepted approach of 1" of deflection per every 250" of beam, with a request for clarification on the basis of this estimation.
  • A participant points out a duplicate thread, indicating that similar discussions may exist elsewhere.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the specific methods or standards for determining allowable deflection, and multiple viewpoints regarding the calculation methods and references to codes remain present.

Contextual Notes

Limitations include potential dependencies on material properties and construction codes, as well as the need for further clarification on the basis for the 1" per 250" deflection guideline.

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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