Calculating Stresses for Metal Pole Design in Audio System Installation

[Shady Artin]

I'm working on a public area audio system where we need to install our horn speakers on big height as per their installation requirements.

We designed a metal pole as described:

Pole consists of two poles: 1) a 7.5 meters height, 10" diameter, 6mm thickness. 1.5 meters are to be buried underground with concrete base, 2) a 4 meters height, 3" diameter, 5mm thickness. 1.5 meters are common with part1 pole and to be attached to it by two hinges with round metal "belts".
Final product should be of 10 meter height, 1.5 meter of them is underground, so it will be 8.5 meters above ground level.

On the top 2 meters of part2 pole, we should install 8 horn speakers on 4 levels (from top of pole: 50cm, 80cm, 110cm, 140cm) each horn weights around 10 Kg each (total of 80 Kg)

Final pole should withstand wind speed: 3 sec. gust speed, 45 m/s (160 km/h) at 10 m above ground
I need to know, how should I calculate the stresses to make sure that the pole will stand till under winds and also we are thinking about making the lower part 6 meters height instead of 7.5 meters and increase the difference in the upper part to be 5.5 meters instead of 4 meters for financial reasons, will that be acceptable??

Attached our initial design for more details.
Thanks in advance for your usual help

 

[berkeman]

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[berkeman]

I need to know, how should I calculate the stresses to make sure that the pole will stand till under winds and also we are thinking about making the lower part 6 meters height instead of 7.5 meters and increase the difference in the upper part to be 5.5 meters instead of 4 meters for financial reasons, will that be acceptable??

You seriously go to the Internet to try to get help with calculations like this that involve public safety? Don't you have professional engineers available to do this? Don't you have an insurance company that needs to sign off on the final design and construction? Don't you have city inspectors whose job it is to approve plans like these and do final inspections and sign-offs on the project?

Please get professional help locally, instead of putting the public at risk trying to cut corners on your construction projects getting advice off of the Internet.

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