Quote:
Originally Posted by Astroman
Well if it won't work as a pier you could always put a rocket motor on it and fly it :-)
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I don't think NASA has big enough solid boosters
...around 200kgs mass at a guess.
I debated about the gusset lengths and decided what the hell...they will help reduce flex by holding the pipe under tension on each corner and caterpillar welding along these should help reduce harmonics nodes. Thus placed the gussets to base apex's.
Well that's the theory.
I was going to concrete in studs to the base but was recommended to ChemWeld the base bolts to the concrete pad. Sounds interesting...better start researching about this.
edit:
Hi Rodger. Of course all structures have a natural harmonic freq. At a guess, along a pipe this will be a node half the pipe length ~1/4 wave of the natural freq. The sand is to help dampen & absorb oscillations. Just like a dead blow hammer I guess. The theory was that the gussets welds would change the nodes points along the pipe by creating hard points.
Well, as for mechanical engineering, what I know you could write it all on the back of a postage stamp! Just stuff I picked up researching piers and deflections. In reality vibrations are probably the least of my problems.