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gbradley1-Visitor
1-Visitor
September 10, 2014
Question

RE: producing a 2D graph from 2 variables

  • September 10, 2014
  • 1 reply
  • 4827 views

I'll try and explain this the best I can and also the fact that I don't know if Mathcad can actually do what I require

I'm trying to produce a 2D graph from two varibles which can change. The graph is for a design of a beam where:-

  • The load applied to the beam is known.
  • The moment capacity of the beam is known.
  • However the span can change
  • The adjacent beam centers can change.

The unity ratio of the beam passing <1.0 and failing >1.0

I've attached a what I think it should look like and the formula. I believe this may require some sort of programming or I'm not sure whether Mathcad can actually do something like this.

Please bear in mind I'm using Mathcad 14

Thanks

1 reply

A
AlanStevens19-Tanzanite
19-Tanzanite
September 10, 2014

This should be straightforward in Mathcad. You can rearrange your formula to get CC = ... with SPAN on the right-hand side - you would then put in values of SPAN, get out the corresponding values of CC and plot one vs the other.

However, I'm puzzled because your formula suggests CC is inversely proportional to SPAN squared (which is nothing like what you've drawn!

Alan

G
gbradley1-VisitorAuthor
1-Visitor
September 10, 2014

The reason for the sqaured is to get the top part of the division into kN.m and the bottom part of the equation is kN.m therefore giving an answer of no units and just a number i.e. 1.0

A
AlanStevens19-Tanzanite
19-Tanzanite
September 10, 2014

Gareth Bradley wrote:

The reason for the sqaured is to get the top part of the division into kN.m and the bottom part of the equation is kN.m therefore giving an answer of no units and just a number i.e. 1.0

I understand that. What I was referring to was the fact that your graph shows CC increasing as SPAN increases (I assume the x-axis is SPAN); but your formula has CC decreasing as SPAN increases!

Alan

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