Columns at .13M, 25 / side
Columns at .13M, 12 / side (just to see)
Columns at .033M diameter, 25 / side.
Lets make this happen. Oh and this last image has a simple box profile as opposed to the other two which are tapered.
See Scott's "Steel Box Girder - More Cross Section Sketches" post.
7 comments:
The elevation is a little too smooth right now. I think it should have the same informal/imperfect quality as the plan. Will work on it.
Note:
From the Lent bank to the West peak is a run of 70m, which means at 1:20 we can rise 3.5m to a total of 5m above water level. We can go higher at the east peak since the bridge is longer.
Additionally this means that the length of the short side (West) is about 145-150m total, which is about 15-20% longer than a straight bridge. Id like to get it down to only 10% longer, which means under 140m. Ok.
145 is 11.1% longer than a 130m straight bridge.
it looks awesome, i actually like the ones with 25 columns better. the slope is 1:20? it looks steeper, but that's cool if it's wheelchair proof.
Looking good! I should also mention that the 25 column count was for vertical loads. I have a feeling that horizontal loads and horizontal vibrations will be an issue for this design. If we follow the Kait model for dealing with this, we would add a certain number of shear members (aka horizontals) that are disguised as columns. We may also be able to get some horizontal support at the shores depending on what we do there.
Oops I was wrong with the initial distance. Our short side is currently 185m from shore to shore, so 42% longer. No good.
Another way to look at is that at average walking speed (3m/min) a straight bridge would take 1:38 to cross, whereas ours would take 2:19. Ill see if I can get it under 2min (160m).
I don't mind it being 185m, especially after looking at the walking speed.
Actually I don't really care as long as it doesn't look to 'flat'. I think if the curvature in plan doesn't read as consistent there's the risk that it looks like 2 bridges. in which case the east half seems like an addition, supplementary but not necessary.
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