Isolated Circular Tank - Aerodynamic Shape Factor AS1170.2

Question

Isolated Circular Tank - Aerodynamic Shape Factor AS1170.2

rpand4 (Civil/Environmental)

(OP)

5 Mar 20 06:02

Hi

I am working on a circular water tank that is 6m in diameter and the tank itself is 1m high. This tank is held 10m above ground on a frame. I am trying to work out the aerodynamic shape factor using AS1170.2 Cl C5.2.1. The formula for Cpb is only valid provided c/b is between 0.25 and 4.0 inclusive. in my case c/b=1/6=0.167. Which means I cannot use that formula to calculate cpb. So what do I do? The code is not very clear on this.

Any assistance is much appreciated.

Regards

rowingengineer (Structural) · Answer 1 · 2020-03-05 09:51:33

You probably need to look at the paper which the code references for this and see why they put in the limits and then use engineering judgement.

http://www.nceng.com.au/
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."

Settingsun (Structural) · Answer 2 · 2020-03-05 11:19:43

This rings a bell. In the thread linked below, someone suggested AS 1210. I don't have it myself to check whether it covers your case but worth a mention.

thread744-436460: AS/NZS 1170.2 Cfig for Cylindrical Tank

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Isolated Circular Tank - Aerodynamic Shape Factor AS1170.2