nuadre
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Homework Statement
"Design a bridge over a valley 300m wide. Road surface is supported by a truss underneath."
My problem: With calculations
Now calculation for buckling says i need to design the truss for compression such that
I > (P. L^2) / (pi^2 x E )
or Pcr > P
where
I = reduction value
P = unfactored load
L = length
E= modulus
pi = Pi.
Pcr= Critical Load
Now the information I'm given doesn't give me a value for I, just the rest. Not sure what I'm meant to do, just estimate a value and insert it in and do calculations from this or another method or if I'm meant to know the value fro plastic piping (?)
- diameter (can work out effective area)
- modulus
- yield strength
- length
Homework Equations
Sum Fx= 0
Sum Fy= 0
Sum M(hinge) = 0
The Attempt at a Solution
Not sure where to start, as it doesn't seem to be enough information?