[SML] Rigging calculation question...

[JIM VOGEL]

As a person who asks questions, I disagree.
If you don't know enough to ask, your probably not qualified to do it.
If your knowledgeable enough to ask intelligent questions, you may very well be qualified to do it.
And a licensed structural engineer is very often a good idea, even when you think you don't need to ask.

Sent from my iPhone

On Oct 5, 2016, at 17:34, Bill Conner via Stagecraft <stagecraft at theatrical.net<mailto:stagecraft at theatrical.net>> wrote:


Well, not trying to be mean but if you have to ask, you're not qualified to do it.  If the screen is wider than the middle 4 points, then the center two are carrying a majority and the next one each side less, and the long and short nearly nothing. That all assumes the controls are perfect.

A licensed structural engineer would be a good idea.

On Oct 5, 2016 3:05 PM, "Jason C via Stagecraft" <stagecraft at theatrical.net<mailto:stagecraft at theatrical.net>> wrote:
So how do you all calculate loads for large items that have several connection points to the truss they are hung from?

Example, 70' Truss flown off 6 motors to steel beams.  Hanging an LED wall off the truss.  Wall is 44' long, centered on the truss.  Total weight of wall and hanging hardware is roughly 4600lbs.  the wall/hardware will connect to the truss at approximately 20 points along the length of the wall.

To get a rough estimate, I was encouraged to just do an evenly distributed calc across the 6 motors, but I know this is not accurate as the wall only extends a few feet past the inside 4 motors.  Almost all the weight is contained to the inside 4 motors if I understand it correctly.

Any thoughts as to how should I be calculating this load so I can get an acceptably accurate idea of load per motor point?

Thanks!

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