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Yeah, HRS is hot rolled steel. I'll have to doublecheck the numbers again I guess. Thanks for your suggestions.

rb1957: I'm assuming that you mean "squat" as in that's not a lot of stress? What do you have the yield stress of HRS being? The person who did the previous calculations used 39ksi, giving a safety factor of a little more than 2. We need a safety factor of four. I assumed his number was...

vonlueke: Am I right in assuming that by 'conservative' you mean the classic beam theory results are on the high side and that those provided by an analysis using a more accurate representation would be lower?

vonlueke: Thank you for the response. I mentioned in one of my previous posts, the 'roller' support I'm using is actually representing the resultant reaction force of the load from a triangular support gusset (two gussets really). The beam is actually a manipulator arm with 3 segments which...

And yes, the load at the end is in the -ve direction. Just because I don't have a lot of experience with it, when would your indeterminancy be dependend on the stiffness? I'm guessing you mean the stiffness of your supports, i.e. whether or not they would deflect/stretch before the object they...

Great!! Thank you to all of you for your help and input.

I figured EI washed out. And it won't be changing, so I can consider it a constant. I will need the moments in the beam eventually, but my main concern is to verify I've done the initial calculations correctly first. In developing my load equation using singularity functions, I treated the...

Yes, my reaction set is balanced but you're right, there are several results that would satisfy the equilibrium equations. The support force is actually being used to represent the resultant of a reactionary load being applied on the beam by a triangular support gusset. I assumed the load...

I apologize. The support at 6.8 inches should actually be considered as a roller support on the underside of the beam, thereby preventing deflection in the y-direction but not slope. As far as needing the modulus of elasticity and the moment of inertia, I didn't think those were required to...

I have a beam 85.4 inches long that is fixed at one end. There is a load of 600 lbs at the other end. It is supported by a pin support (0 defelection) at 6.8 inches from the fixed end. I need the reaction forces at the fixed end, at the support and the moment at the fixed end. I have done...