Re: Random Paper of the Day

From: OM (om_at_our_blessed_lady_mary_of_the_holy_NASA_research_facility.org)
Date: 02/28/05 

Date: Sun, 27 Feb 2005 23:45:37 -0600

On Mon, 28 Feb 2005 00:50:26 GMT, "Greg D. Moore \(Strider\)"
<mooregr_deleteth1s@greenms.com> wrote:

>In reality, the danger of collapse was obviously underestimated. However,
>given the design, it was fairly unlikely (as was borne out) that it would
>tilt over. (I've seen the math, and first pass I believe height has to be
>4x the width of the base before tipping becomes an issue, and that's in
>something not designed to withstand windloads, etc.)

...Yeppers. The 4x usually contains a "fudge factor" that's derived
from the strength of the actual components in the bottom 1/4 of the
tower, as was explained to me by an ArchE I do system maints for on
occasion. IIRC, he also pointed out that the 4x really only applies
best for buildings where the base is pretty close to the same
dimensions as the roof WRT width and length. Something like the ESB
would have a bit of a different tipping ratio.

                                OM 

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