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Old 07-08-2007, 12:33 PM   #1
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Would this hold?


We need to design a bridge to go over a river. The total length will be 40', I added 20' to cover the banks of the river. I don't know the depth of the river so the footings depth is undetermined.

It has to hold a min of 1000 lbs. Everything pressure treated. Any help would be good.


Thanks
Josh
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Old 07-08-2007, 01:01 PM   #2
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Would this hold?


Your drawing doesn't show the size of the dimensional lumber. So to answer the question "would this hold" is impossible.

Also, I'll say this: 1000# isn't as much as it sounds like when dealing with lumber and structure.

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Old 07-08-2007, 01:30 PM   #3
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Would this hold?


Everything is 2x12's and the posts are 8x8's notched out for the 2x12's. I really didnt know what would be right so I jsut made it out of 2x12's.
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Old 07-08-2007, 01:53 PM   #4
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Would this hold?


I'd say that would hold MUCH more than 1000#, so if your goal is to find the minimum specs...you've over-engineered.
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Old 07-08-2007, 03:20 PM   #5
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Would this hold?


Thats what I was hopeing for. I wanted it to be extra so this way we could get more stuff over it.

What would you use for decking?
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Old 07-08-2007, 04:11 PM   #6
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Would this hold?


I was being intentionally...kinda vague. I thought this was for a class or something. You're actually going to build this?

There are alot more things to think about in the real world than lumber and structural support. What are the soil conditions at the river bed? How deep is it? How are you doing to excavate for the footings...coffer dam?

I realize, no wider than it is, it's probably not very deep, but you still need to consider how you're going to go about building this thing.

When does this need to be done?

How will all these 1000# items, or combination of items cross the bridge? In a person's arms? Wheeled cart? The weight of whatever mode of transportation suits you has to be considered into the engineering. If it's going to be foot traffic, it will create alot of vibration and settling in the soil around the footings.

How fast is the river? Is wash-out going to be a problem?

There are so many things that go into engineering a bridge it's not even funny. Is there no alternative to get these items across the river?

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Old 07-08-2007, 05:26 PM   #7
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Would this hold?


This would work better, especially if you will be driving vehicles over it.
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