## Corrugated rectangular tank

## Corrugated rectangular tank

(OP)

Dear All,

Can you edify me on design of corrugated rectangular tank. Earlier i have designed rectangular tank as per Roark's formulae.

But this time, it is corrugated tank : so per my understanding it would be difficult to add stiffeners on wall.

Thus, without stiffeners bending stresses generated in the wall would be high & it would ultimately result into higher thickness.

So can we take advantage of corrugation provided on wall of tanks to lower bending stress.

If yes then how ?

OR

what is alternative for it

Also what is purpose of corrugation.

Tank dimensions (Just for information)

L=6000mm

W=1500mm

H=1700mm.

Thanks in advance for your guidance.

Can you edify me on design of corrugated rectangular tank. Earlier i have designed rectangular tank as per Roark's formulae.

But this time, it is corrugated tank : so per my understanding it would be difficult to add stiffeners on wall.

Thus, without stiffeners bending stresses generated in the wall would be high & it would ultimately result into higher thickness.

So can we take advantage of corrugation provided on wall of tanks to lower bending stress.

If yes then how ?

OR

what is alternative for it

Also what is purpose of corrugation.

Tank dimensions (Just for information)

L=6000mm

W=1500mm

H=1700mm.

Thanks in advance for your guidance.

## RE: Corrugated rectangular tank

Or

corrugation dimensions shall be finalized on the basis of required moment of inertia.

Kindly suggest.

## RE: Corrugated rectangular tank

## RE: Corrugated rectangular tank

## RE: Corrugated rectangular tank

I used to count sand. Now I don't count at all.

## RE: Corrugated rectangular tank

## RE: Corrugated rectangular tank

I used to count sand. Now I don't count at all.

## RE: Corrugated rectangular tank

## RE: Corrugated rectangular tank

## RE: Corrugated rectangular tank

Seems nontrivial to me.

Mike Halloran

Pembroke Pines, FL, USA

## RE: Corrugated rectangular tank

## RE: Corrugated rectangular tank

Below is my understanding for checking / deciding corrugation dimensions:

In absence of stiffeners, unstiffened length would be same as length of tank (if corrugation is run along the length).

Considering unstiffened length (tank length), bending moment would be calculated and thus this would result into requirement of high moment of inertia.

In order to satisfy above requirement, required moment of inertia < no of corrugation X Moment of inertia of single corrugation.

This is how quantity and dimensions of corrugation (trapezoidal) is to be decided.

Is my understanding correct?

If wrong than please correct me.

## RE: Corrugated rectangular tank

;---

Separately, note that corrugations add some complexity to the stress conditions at intersections, which complicates the fatigue analysis.

Mike Halloran

Pembroke Pines, FL, USA