I have no idea what any of your variables mean. Please post the original problem word-for-word.
Want to calculate Apsl?
Mu1 = fpb Apsl (d-dn1)
Where
Mu1 = 56.6*106
fpb = 0.95*1750
d = 156.7
dn = fpb Apsl / 0.9 fcu b
fcu = 50
b = 1168
Mu1 = 56.6*106 = ( 0.95*1750* Apsl*156.7 ) – (0.95*1750* Apsl)^2 / 0.9*50*1168
The values I have worked out are not appropriate to the solution I am trying to solve. I the areas of the equation where I don’t understand is moving 156.7 & ^2
If anybody could help I would be grateful
Thank you for posting the better pictures.
This looks like a straight-forward algebra problem. What I would do is work with the equations 4.24, 4.25, and 4.26, and combine them in order to eliminate the variables you don't know. Your goal is, apparently, to find So solve for that variable in terms of variables you know. Do this algebraically, without plugging in any numbers. What do you get?
You start with two equations:
and
Now you simply plug the first equation into the second and distribute:
Therefore,
This last expression is what you have plugged your parameters into. You will, incidentally, need to use the quadratic formula in order to solve for the target variable.
Does it make sense now?