API 650 supported cone roof 1

[Ziad00]

Hello, I am designing a water tank with diameter 7.5m and height 9m and i want to make a supported cone roof without any columns just rafters and girders but the code talk about a supported cone roof with columns. Is there any tips to do what i want?
Thanks in advance.

 

[Geoff13]

For a 7.5m diameter tank, if I didn't want a centre column, I'd probably use a self-supporting cone.

 

[Ziad00]

Sorry it’s 15m diameter not 7.5m

 

[LittleInch]

Please don't double post.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[JStephen]

Yes, it can be done. With a steeper roof, you can use a center compression ring. With a shallow roof, you can use a similar arrangement with moment connections where the rafters intersection the center ring. This will load the center ring in a "rolling" fashion producing moments in the ring.

 

[HTURKAK]

For water tank with dia . 15.00 m. I would prefer cone roof with exterior roof str ( exterior radial rafters and girders ) without any column.
...

He is like a man building a house, who dug deep and laid the foundation on the rock. And when the flood arose, the stream beat vehemently against that house, and could not shake it, for it was founded on the rock..

Luke 6:48