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OA_130398195-Regular Member
5-Regular Member
September 23, 2026
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Finding the thickness of an angle for "Pour Stop for Metal deck wet concrete"

  • September 23, 2026
  • 2 replies
  • 66 views

Good afternoon, Community,

Would anyone be kind enough to help me trouble shoot the attached Mathcad Prime 11 file.

I am try to calculate the thickness of an angle to withstand the hydro pressure of wet concrete, using the symbolic method, with no luck.

 

Thanks

Boyer

Best answer by Werner_E

By writing t.m >= … no value is assigned to variable t.M. So you can’t use t.M later in further calculation as it does not exist.

You may use simple assignments instead as you cannot create a variable which you demand to have any value grater than …. You must assign a specific value.

But as you can see below it looks like you have a unit problem as none of the three expressions simplify to domension length(thickness). And because t.M is of different unit than the other two, the “min” function refuses to do its work as you can’t compare apple and pears (‘Units not compatible’).

 

I should start by saying that I don't have the slightest idea about your field of work, so I don't know if this makes any sense. But I've noticed that you get consistent units if you increase the root exponents by 1:

BTW, if you are looking for the smallest value which is larger or equal than any of the three variables you sure would have to look for the “max” of the three.
 

 

2 replies

Werner_E
Werner_E25-Diamond IAnswer
25-Diamond I
September 24, 2026

By writing t.m >= … no value is assigned to variable t.M. So you can’t use t.M later in further calculation as it does not exist.

You may use simple assignments instead as you cannot create a variable which you demand to have any value grater than …. You must assign a specific value.

But as you can see below it looks like you have a unit problem as none of the three expressions simplify to domension length(thickness). And because t.M is of different unit than the other two, the “min” function refuses to do its work as you can’t compare apple and pears (‘Units not compatible’).

 

I should start by saying that I don't have the slightest idea about your field of work, so I don't know if this makes any sense. But I've noticed that you get consistent units if you increase the root exponents by 1:

BTW, if you are looking for the smallest value which is larger or equal than any of the three variables you sure would have to look for the “max” of the three.
 

 

    OA_130398195-Regular MemberAuthor
    5-Regular Member
    September 24, 2026

    Good morning, Werner,

    You are correct in your assessment, the moment Mmax has a unit of kip-in / ft which make your assumption correct by increasing the root exponent by 1. Thank you for your help.

    Boyer

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