Finding max bending moment
Finding max bending moment
(OP)
Hi folks.
See file attached.
Its an simply supported beam with an concentrated force.
I cant program Mathcad to find the x value were shear force diagram intesects with x axis.
I know at wich value is this going to happen for this loading scenario but how to tell mathcad to slove this?
I tired using the root function but no luck.
Please help.
Thank you
See file attached.
Its an simply supported beam with an concentrated force.
I cant program Mathcad to find the x value were shear force diagram intesects with x axis.
I know at wich value is this going to happen for this loading scenario but how to tell mathcad to slove this?
I tired using the root function but no luck.
Please help.
Thank you
RE: Finding max bending moment
TTFN

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RE: Finding max bending moment
IRatuff I see that you noticed that Ive created an discontinous function is this the wrong way?
WOuld you do it someother way?
thank you
RE: Finding max bending moment
TTFN

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RE: Finding max bending moment
Please see file attached.
If I define a picewise linear function like in the file attached, I still have an discontinuity for the part were the graph is vertical.
So how to find these two values for x were the graph intesects with x=0?
Please help.
RE: Finding max bending moment
RE: Finding max bending moment
My goal would be that Mathcad spits 2 numbers out....in this case -1.5 and +1
RE: Finding max bending moment
RE: Finding max bending moment
http://s000.tinyupload.com/index.php?file_id=02292...
YOu can see that V(x) cuts the abscisa at 2 loactions.
I Know how to find one of them, but can Mathcad spit out both values if the egsist?
Thank you.
RE: Finding max bending moment
YOuve uploaded 2 same files...
RE: Finding max bending moment
RE: Finding max bending moment
http://files.engineering.com/getfile.aspx?folder=a...
TTFN

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RE: Finding max bending moment
So basicly you defined that vertical portion with an equation BUT it has an very,very small slope?
RE: Finding max bending moment
Seem to work for this kind of problem
http://s000.tinyupload.com/index.php?file_id=04732...
Thank you.
RE: Finding max bending moment
In previous egsamples i have a function V(x)=....
I can get an value of V for any given x that I type in th brackets.
Is it possible vice versa?
I wanta to know at wich x would V= defined value?
So bascily I would need to First type eg. V=20kN and then Mathcad would give value for x at wich V=20kN
Possible?
RE: Finding max bending moment
x:=1 [initial guess for solve block]
given [required for solve block]
V(x) <CTRL>= xx [press the <CTRL> key and then the "=", resulting in a bolded equal sign, unless you've dinked with the fonts]
x := find(x) [or] find(x) = [the former assigns the found value of x to x, so that it can be used in subsequent calculation; the latter simply displays the found value, but x remains at the initial guess value]
TTFN

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RE: Finding max bending moment
one more question,see file attached.
http://s000.tinyupload.com/index.php?file_id=56723...
Is there anyway that I can condition the statement so that it looks for values belowe 4m and second statement for values above 4m?
RE: Finding max bending moment
RE: Finding max bending moment
> You need to change the guess value of x to be >4 -- for the second set of Finds
> Change find to minerr -- sometimes this works, and sometimes not - it worked a couple times on your sheet when I tried it, and failed most of the other times. The algorithms are all somewhat dependent on having continuous functions, so the discontinuous functions are very challenging
TTFN

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RE: Finding max bending moment
Is this spelt corectly?
I get an error every time when I try this.
So the solution woul dbe to convert this discountnous function into what you suggested "very steeep slope"wich would make it continous,
RE: Finding max bending moment
TTFN

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RE: Finding max bending moment
RE: Finding max bending moment
" You need to change the guess value of x to be >4 -- for the second set of Finds"
this works fine at my place
thanx!