I did the same calculation. If you step the structure enough times, you
have a better chance with unit stresses. Spread the load far enough and
you have a chance. Look at the Empire State Building; you can bet (with
the value of the rental space) they didn't step the building because of
Someone earlier suggested 75 feet of drift. If you assume a cantilever and
an allowable deflection of l/360, you get 167 feet. Not to worry tho; I'd
die of heart failure long before the building swayed that far.
Fountain E. Conner, P.E.
Gulf Breeze, Fl. 32561
> From: Paul Meyer <PMeyer(--nospam--at)HASimons.com>
> To: 'seaint(--nospam--at)seaint.org'
> Subject: RE: 30,000 foot Skyscraper.. .......!!!!!!
> Date: Tuesday, May 11, 1999 3:55 PM
> 10 km high (ballpark)
> stress due to self-weight of steel column that high - 77. 0 kN/m3 x
> = 770 MPa.
> So, for a building with 50% net column area at ground floor, (yeah
> you need a steel yield strength of about 1700 MPa.
> We're talking 4340 steel, heat treated and everything, and 50% coverage
> ground level.
> Any other thoughts? anti-gravity machine?
> Subject: Re: 30,000 foot Skyscraper.. .......!!!!!!
> chances are, it may collapse under its own weight.
> errm, well it is getting late *yawn*.
> On Mon, 10 May 1999 Rbengrguy(--nospam--at)aol.com wrote:
> > Attention fellow Structural Engineers.
> > This message is just in from the WORLD's Tallest Building website
> > Maybe you have some thoughts on trying to build a 30,000 foot