stress on a span

[abjohnson]

what would be a formula for finding stress on a platform suspended by the ends. I want to find out the load capacity in the middle of the span. I realize there are many variables. the platform span is 130' long by 20' wide and needs to support up to a 15000 lbs load at it's center. how would the platform need to be constucted and with what materials, or can someone give me specs based on aluminum steel etc.

 

[boo1]

abjohnson, you are scaring us asking how do i..... This is not a trival problem. Get a professional on board to help you design it.

The design process for a steel beams can be summarised as follows:
a) Determination of all forces and moments on critical
section with appropriate safety factors included
b) Selection of UB or UC
c) Classification of section
d) Check shear strength; if unsatisfactory return to (b)
e) Check bending capacity; if unsatisfactory return to (b)
f) Check deflection; vertical deflection and
lateral, if unsatisfactory return to (b)
g) Check web bearing,unbraced length, flange ratio and
buckling at supports or concentrated load; if
unsatisfactory provide web stiffener
h) Check lateral torsional buckling; if unsatisfactory
return to (b) or provide lateral restraints
i) Design platform, add dead wieght go back to d
j) perform dynamic analysis
Summarise results