Quote:
Originally Posted by Empire
If the stadium were to be built in Willow Park or any area with a residential component nearby then I think a more discrete design would be desirable. A cantilever roof would likely work better here as it would garner less attention. To go column and cable free would be more expensive but would yield a very efficient product. Perhaps a goal of raising 25% the cost would get the attention of government and private investors. If the total cost is $60 million could 10-$15 million be raised through fundraising and donations? It seems like a lot without offering a return through a share offering but a trust fund would be the catalyst. Fenwick your latest design looks very good and this style roof would fly under the radar. Also if columns were reqiured for this roof I think it may be acceptable. Maybe the columns could be located between the upper and lower sections so that only the upper section has some obstructed views. This would leave some overhang beyond the support columns if they were vertical. Any angle may obstruct more view?
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I agree completely; a trust fund is crucial to getting this stadium built. I had forgotten that this was our initial reason for doing all of this work on the 3D model and other promotion of this idea; in order to have the city or provincial corporation set up a secure trust fund for people to contribute to. This will not be a simple task, since a full time person might be required to manage it and send out donation receipts. So if the city does this, they will have to be convinced to hire someone (clerical position). Perhaps they could start with someone already employed and then if it is extremely successful they could hire someone full-time.
Also, money from naming rights might easily bring in another $10 million over 10 years. In very large cities, it brings in much more. However, this usually comes after construction has started, or at least once a commitment has been made. If there was the potential of Halifax getting a CFL team then the value for these naming rights should be worth this much money.
If a trust fund could raise $10 - 15 million then that would be very successful and I think that might convince the city to proceed. Essentially the trust fund is taking the place of a private investor. In addition to individual smaller donations, there could possibly be much larger contributions from wealthy Maritimers.
Initially, when I started the 3D model, I wanted to show how it could be built in stages as money becomes available. the initial stage could just be the bottom bowl, which is mainly excavation, leveling the excavated ground and building retaining walls and the lower bowl (which is like a terraced garden). Washrooms would also be required. Then temporary stands could be added around this lower bowl to increase the capacity. There would initially be no roof. However, the final stadium should be designed in advance so that when it is expanded with more permanent seats, it will not look like a piecemeal design and it will be designed with a roof in mind.
With regards to the cantilever roof, we think alike on this also. I think that the stadium should be fairly low profile. The cantilever supports are essentially like cranes. If there are fewer supports then they must be larger. If there are only 2 per side then they must be quite massive and there must be a large truss somehow integrated under (or on top of the roof). If there are more cantilever supports then they can be smaller in capacity and have less of a truss type support. There is going to be a happy medium, for example maybe 5-10 cantilevers per side which would reduce the size per cantilever support but increase the number. One example of a large cantilever design where the supports are integrated with the stadium stands is the Seattle, Washington Husky Stadium (
http://football.ballparks.com/NCAA/Pac10/Washington/index.htm ). This Seattle stadium roof is actually larger (in terms of overhang) then what the 3D model design would require (it would require about 130 feet overhang depending on the incline). The 3D model stadium roof would require a long span of about 700 feet from one end to the other. If done with roof trusses alone, then the roof trusses would have to be quite large like in this link
http://1.bp.blogspot.com/_g-J5F47Klrs/SK2ro3oOR_I/AAAAAAAABJM/r-KnN6wWndA/s400/06pano_roof1_sm.jpg (smaller than this since this is the support for a large retractable roof). However, as you pointed out if there are a few internal supports then this will decrease the size of the external supports or make the roof trusses smaller. This results in a more appealing stadium design from street level. The supports could be in the upper tier in the aisleways to minimize the number of obstructed seats. The internal supports would likely eliminate or decrease the size of external exterior supports.
There are many alternatives to the roof design. There is also a mast design (like in the Commonwealth Stadium design) that uses suspension cables. One truss type design that I like is this one:
http://en.wikipedia.org/wiki/Reebok_Stadium . However, some people might consider this to be very obtrusive. This was only 25 million British pounds back in 1997.
I think that it is important to think about these factors in advance so that we can give our opinions on an appealing design. In the end, the actual stadium will be designed by a structural engineer with many years of experience (or most likely a team of structural engineers, architects and construction trades people).
P.S. The stadium that I showed above doesn't have a roof support, so it looks more appealing than the actual design would be. Right now, I would like opinions on how this roof support should look. This is about the correct span for a roof truss system:
http://football.ballparks.com/NFL/SeattleSeahawks/newindex.htm . As much as I like all of these designs, from a purely aesthetic point of view, an internal column system is appealing although it is a throw back design to a few decades ago (it is used in Fenway Park).