Bridge Building 2016

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Bridge Building 2016

Postby retired1 » September 4th, 2015, 2:54 pm

Just got the rules. It is going to take some thought as well as a few broken bridges to get a good bridge.

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Re: Bridge Building 2016

Postby 0ddrenaline » September 4th, 2015, 7:25 pm

I already have so many ideas. I'll have to do a ton of experimenting for this year. I expect to see many unique designs from others.

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Re: Bridge Building 2016

Postby laidlawe18 » September 6th, 2015, 12:53 pm

My rules have yet to arrive. Would anyone be so kind to outline what has changed for this year? There are have been rumors of elevation requirements or sand on the test surface, but I'm dying to know what they ended up actually doing.

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Re: Bridge Building 2016

Postby windu34 » September 6th, 2015, 1:04 pm

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Re: Bridge Building 2016

Postby retired1 » September 6th, 2015, 1:51 pm

Right side is elevated 5 cm and the left side has a max height of 2 cm at the side of the clear span area.

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Re: Bridge Building 2016

Postby laidlawe18 » September 6th, 2015, 2:31 pm

I attached a rough diagram of what I understood that as. Is there a clearance zone like there was in 2009 and 2010? Is there a maximum height or any other building restrictions?

Thanks for the information!
bridge picture.png

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Re: Bridge Building 2016

Postby bernard » September 6th, 2015, 2:40 pm

Right side is elevated 5 cm and the left side has a max height of 2 cm at the side of the clear span area.
It is no higher than 2 cm in the Bearing Zone, which is different from the Clear Span Area.
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Re: Bridge Building 2016

Postby laidlawe18 » September 7th, 2015, 7:11 am

How low can your bridge go? My assumption would be no lower than the lower supporting block. Also what is the max height?

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Re: Bridge Building 2016

Postby bearasmith » September 7th, 2015, 7:46 am

There is no max or min width of the bridge, and I don't think there is any max height.
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Re: Bridge Building 2016

Postby bernard » September 7th, 2015, 11:49 am

How low can your bridge go? My assumption would be no lower than the lower supporting block. Also what is the max height?
3.c.: No lower than the top of the Test Base. (Also there is only one Test Support, so there isn't a lower one.)
3.d.: No contact with a non-horizontal side of the Test Support.
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Re: Bridge Building 2016

Postby retired1 » September 7th, 2015, 1:32 pm

Also remember that all bridges will deflect to some degree when loaded and the bridge can not contact the clear span area when it deflects.

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Re: Bridge Building 2016

Postby doge » September 9th, 2015, 8:07 pm

Will it count as a violation/disqualification if the loading block happens to slide down and away from the centerline somehow (not sure if this would actually happen, just speculating..)?

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Re: Bridge Building 2016

Postby bernard » September 9th, 2015, 8:21 pm

Will it count as a violation/disqualification if the loading block happens to slide down and away from the centerline somehow (not sure if this would actually happen, just speculating..)?
5.b.iv. involves direct placement of the Loading Block by team members, so it would be alright by that rule. But if the Loading Block slides far enough, the chain would rest on the edge of the 20.0 cm x 20.0 cm opening, which counts as failure by rule 5.b.viii.. As always, this isn't the place for official clarifications/FAQs; official FAQs open Oct. 1 and can be submitted through the national website.
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Re: Bridge Building 2016

Postby JimY » September 20th, 2015, 8:34 am

My advice is to NOT have the loading block at an angle (horizontal only). Our team will be pursuing designs that look like an elevated bridge (from several seasons ago) on the left end and a flat bridge like last season on the right end.

The 5 cm test support may prove to be very interesting to in another way too. The bottom of the bridge is always under tension and therefore stretches a bit. If the end opposite the test support stays stationary, the end on the test support may not slide on the test support itself, but rather cause the test support to start leaning on one of the 5 cm long edges. The question is will it ever lean enough to cause premature failure. So, once teams start building and testing, please give some feedback on what you see regarding the test support during loading.

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Re: Bridge Building 2016

Postby DoctaDave » September 20th, 2015, 10:43 am

My advice is to NOT have the loading block at an angle (horizontal only). Our team will be pursuing designs that look like an elevated bridge (from several seasons ago) on the left end and a flat bridge like last season on the right end.
Be careful if you are making the side opposite of the 5cm test support elevated. The other side CANNOT be over 2cm within the bearing zone. I think that rule was specifically made so that teams could not, or would have a lot of trouble making one side of their bridge elevated.


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