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Re: period of straight steel stack

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Joe,
 
It's 7.78/(10^-6)*(H/D)^2(12*w*D/t)^(1/2).
 
[ASCE Guidelines for Seismic Evaluation and Design of Petrochemical Facilities]
 
V. Steve Gordin, SE
Irvine CA
----- Original Message -----
Sent: Wednesday, December 10, 2008 17:52
Subject: period of straight steel stack

I am calculating the period of a straight steel stack.  Short fat and heavy, my gut says ?rigid? for the wind load definitions, but I thought I would check just to make sure.   Equation 5.17 on page 5-6 of ?Tubular Steel Structures? from Lincoln Welding there is an equation: T=765E-6 x (H/D)^2 x [(12 x w x D)/t]^.5   I also have a copy of ?Pressure Vessel Handbook? which has a formula T=.0000256 x (H/D)^2 x (w x D /t)^.5 .  It appears that the Lincoln formula should be ?7.65E-6 x ?..? not ?765E-6?.?   Or the Pressure Vessel Handbook is off.  That is a difference of 100.  At this point I tend to lean towards the Pressure Vessel Handbook formula due to other formulas in the Lincoln book.  But I could be wrong.

 

Can anyone out there confirm this?

 

Thanks,

Joe

 

Joseph R. Grill, PE

 

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