Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

Re: Foundations for a 3-pinned arch stadium

[Subject Prev][Subject Next][Thread Prev][Thread Next]
Well, it's still enormous, even at 7" dia.
I see what you mean - it's really the formation of a plastic hinge that leads to the instability long before the top pin reaches the level of the foundations. 
I don't think the glu-lam beams will show that much plasticity before the roof caves in. 

Thanks for the explanation, Paul. 

Today, I believe that I established that the foundations need to be anchored in rock, with a key to resist lateral thrust.  The client and the rest of the design team have come on board.  So thanks everyone for your encouragement.

On 10/11/07, Paul Ransom <ad026(--nospam--at)> wrote:
I dropped a decimal in my calcs. That should be:
33 in^2, 113 plf, 7 in dia solid rod, increase for load factors.


> Kevin,

> In your case, the lateral foundation stiffness at each support must be
> 800 k/in +/- to hold a 1" foundation separation. That's 1/2" displacements at
> each support. Load factoring not considered.
> (quick calc tie rod: 330 in^2, 1131 plf, 20" dia solid round, 200 ft long at
> each arch - increase for load factors - how much does the arch weigh after the
> first design pass?)

> Regards
> Paul

******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at:
*   This email was sent to you via Structural Engineers
*   Association of Southern California (SEAOSC) server. To
*   subscribe (no fee) or UnSubscribe, please go to:
*   Questions to seaint-ad(--nospam--at) Remember, any email you
*   send to the list is public domain and may be re-posted
*   without your permission. Make sure you visit our web
*   site at:
******* ****** ****** ****** ******* ****** ****** ********