Grand Canyon Skywalk - Pretty Cool...Eh!
Grand Canyon Skywalk - Pretty Cool...Eh!
(OP)
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
Download nowINTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
Grand Canyon Skywalk - Pretty Cool...Eh!
|
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
really lost and tired ones, i expect ??
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
http://www.eng-tips.com/viewthread.cfm?qid=139451
http://www.eng-tips.com/viewthread.cfm?qid=139978
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
I did a quick calc because I'm bored at lunch: Assuming from those photos that the beams are 3ft x 6ft SOLID 50ksi steel, not dealing with self weight at all, and assuming the load is uniformly distributed, I get a max cantilever of about 10ft.
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
Gotta work now :(
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
FOETS
"social drinker with a golfing problem"
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
They did actual wind speed collection at the top of the cliff and recorded speeds of 80 and 90 mph.
The video also talks about 71,000,000 pounds. I'm still not quite sure where they get that number, because according to that video the glass floor is good for a little more 100 psf. That would mean a walkway area of 710,000 square feet to get to 71,000,000 pounds. There is no way the structure itself could hold up that much weight.
Maybe the 71,000,000 is the theoretical load the foundation could withstand. The structure would fail long before you ever got to that load.
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
Do you wait a while to see how it does with people on it, or go right away before it has a chance to fatigue?
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
If I went it would be before it had a chance to fatigue.
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
"The Skywalk will be able to hold 70 tons of weight, allowing for 800 people weighing 175 lbs. each to stand on the bridge. "
Elsewhere on one of the official sites, I find a statement thus: "On May 2005, the final test was conducted and the stucture passed engineering requirements by 400 percent, enabling it to withstand the weight of 71 fully loaded Boeing 747 airplanes (more that 71 million pounds). The bridge will be able to sustain winds in excess of 100 miles per hour from 8 different directions, as well as an 8.0 magnitude earthquake within 50 miles. More than one million pounds of steel will go into the construction of the Grand Canyon Skywalk."
This sounds like the 71,000,000 lbs is perhaps the ultimate strength of the foundation support points or something of the sort- but very different from any load proposed on the structure itself. This "load test" was prior to any actual steel construction being done, evidently.
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
http://www.grandcanyonskywalk.com/contact.html
Here DSI doesn't show anything like "The Dywidag" mentioned in the picture caption shown in the above. Might be holding off until the Sky Walk proves out.
It would be interesting to know how many the bolts are used and how long they are.
http:/
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
Some material here on the dampers:
http://www
http://archshrk.com/
From this paperL
www.baldersoninsurance.com/September_2006.doc
"Scheduled to open in October 2006, the skywalk designed by Lochsa Engineering in Las Vegas is cantilevered atop the cliff with 94 steel rods that bore 46 feet into the limestone rock. It can support l70 tons of weight, equivalent to 700 big men, but its maximum occupancy is set at 120 people. Three oscillating steel plates weighing 3,200 pounds that are inside the hollow bridge beams act as shock absorbers. They move up and down to neutralize the vibrations from foot traffic and vertical wind gusts that may be up to 94 miles per hour. The sides are made from strengthened, three-inch thick, five-foot-tall glass walls."
Somewhere, I saw 2.5" bolts mentioned. With 94 bolts 2.5" diameter, 71,000,000 lbs gives a stress of 154,000 psi, which seems inordinately high.
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
and I assume that means 54 per side and that
is how many bolts are going to be used.
I cannot comprehend why they would not use some
angular support from the bottom.
I agree that this is an amazing project!
http://www.grandcanyonskywalk.com/video/video.html
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
I saw this a few months ago and threw out the 71 million pound load as garbage. I agree with previous posters about that number migrating over from the foundation side of things. What may have happened is that the square area of the compressive portion of the foundation, coupled with the compressive strength of the rock was leaked. I figure 71 million pounds at 16,000 psi gives a little over 15 square feet per side of compressive area for those beams, which is reasonable.
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
How did you capture the picture and post it
to the web? That is impressive.
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
see FAQ238-1161
you need to put your pictures and emoticons into a hosting server such as www.tinypic.com then copy and paste the provided link into the eng tips message
FOETS
"social drinker with a golfing problem"
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
http://www.grandcanyonskywalk.com/update.html
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
Hg
Eng-Tips policies: FAQ731-376
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
I'd tend to go with the leaning walls as in the Gateway Arch rather than a glass floor, but it's a done deal.
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
http://www.krmconsultants.com
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
RE: Grand Canyon Skywalk - Pretty Cool...Eh!
It was officially dedicated today will all the locals and Eugene Cernan walking out and shaking hands at the tip. While I was watching I didn't see and cameras pointing down.
RE: Grand Canyon Skywalk - Pretty Cool...Eh!