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WR_102200164-Participant
4-Participant
February 23, 2022
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Deflecion in Simply Supported Beam

  • February 23, 2022
  • 2 replies
  • 3776 views

Dear forum members,

 

I'm just trying to write a simple integral equation for the beam deflection (simply supported beam with uniformly distributed load).

 

Could anyone correct me where is the error that in the end it does not come out as it should, i.e. (5/384)*(L^4*q) / EI ??

 

Greetings,

Best answer by Werner_E

You are a victim of Primes infamous autolabel feature.

This is especially a PITA in combination with symbolic evaluation and always good for trouble.

The "L" in your sheet have applied different labels. Some are labeled "variable", some "-" (which means automatic and works pretty well if you just use numerical evaluations) and the worst thing is that some are labeled "unit" (Liter). You have to manually label all those "L"'s the same to make it work.

Furthermore the numeric eval of w(...) failed because the value for "EI" is unknown.

You may either provide this value at the very top of the sheet or you turn w into a function with EI as its fourths argument:

Werner_E_1-1645656358706.png

 

2 replies

W
Werner_E25-Diamond IAnswer
25-Diamond I
February 23, 2022

You are a victim of Primes infamous autolabel feature.

This is especially a PITA in combination with symbolic evaluation and always good for trouble.

The "L" in your sheet have applied different labels. Some are labeled "variable", some "-" (which means automatic and works pretty well if you just use numerical evaluations) and the worst thing is that some are labeled "unit" (Liter). You have to manually label all those "L"'s the same to make it work.

Furthermore the numeric eval of w(...) failed because the value for "EI" is unknown.

You may either provide this value at the very top of the sheet or you turn w into a function with EI as its fourths argument:

Werner_E_1-1645656358706.png

 

    W
    WR_102200164-ParticipantAuthor
    4-Participant
    February 24, 2022

    Thank you very much for your help! 

     

    Are the same actions possible for a simply supported beam but with partially distributed load ?? This seems more complicated than that. To avoid confusion with the unit (as you wrote above) I, I changed the length marking "L" to "LHB" 

     

     

    Greetings,

    T
    21-Topaz II
    terryhendicott21-Topaz II
    21-Topaz II
    February 24, 2022

    Hi,

    Here is exactly the same coding for general loads with input for two partial distributed loads.

    Cheers

    Terry

    T
    21-Topaz II
    terryhendicott21-Topaz II
    21-Topaz II
    February 24, 2022

    Hi,

    Here is a sheet that can handle multiple loads of a generic shape to get you max moment and deflection of a simply supported beam.

    Cheers

    Terry

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