Bean Deflection Problem
Bean Deflection Problem
(OP)
Hello, I am trying to find maximum bending moment developed in a fixed beam due to two equal (or unequal) equi-spaced forces.
[This scenario happens when ventilation mechanics trying to suspend the duct with rods to the ceiling. However istead of attaching to the ceiling they put a channel or an angle across a 6ft span of ceiling trusses. When you do seismic analysis, the rods may or may not develop the same forces which will subject the channel to bending.]
Are there any readily available formulas, which can be applied to these scenarios? Standard beam deflection diagrams do not seem to apply (Unless I can actually combine a reaction moment diagram at a support with the standard simply supported dual force diagram.)
Thanks.
[This scenario happens when ventilation mechanics trying to suspend the duct with rods to the ceiling. However istead of attaching to the ceiling they put a channel or an angle across a 6ft span of ceiling trusses. When you do seismic analysis, the rods may or may not develop the same forces which will subject the channel to bending.]
Are there any readily available formulas, which can be applied to these scenarios? Standard beam deflection diagrams do not seem to apply (Unless I can actually combine a reaction moment diagram at a support with the standard simply supported dual force diagram.)
Thanks.





RE: Bean Deflection Problem
http://files.engineering.com/getfile.aspx?folder=8...
RE: Bean Deflection Problem
The fastest way would be to quickly set up a FEA solution using nodes at each support and each load. It wouldn't take too long to set up a spreadsheet where all you would have to do is change the locations of the input nodes and material properties for each problem.
Or get a software program that will do it for you.
RE: Bean Deflection Problem
Dik
RE: Bean Deflection Problem
So, if I wanted to set up excel, would I have to start with the beam formula and then integrate and accomodate boundary conditions? Assuming this is done I should be able to determine all the unknown reactions... ?
Also that link for Yakov did not work.
RE: Bean Deflection Problem
If you don't have AISC just Google " formula for maximum moment".