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Engineers of the OB: Will this bridge support a loaded log truck?
Bridge span is 30 feet. My grandfather put some steel beams across it in the late 1940s. They're about 12" tall and 8" across (not sure the proper way to describe those dimensions).

There are four total beams. Two pairs about two feet apart. And about 6 feet on centers.

I decked the bridge with full cut 3x10" pine.

Log trucks will be 80,000 pounds. But only half the load will be on the bridge at any one time. I guess the rear axle might carry more weight, so maybe a max of 45-50,000 at a time.

Here are some photos. Thanks for your thoughts and advice.

Image: https://i.imgur.com/RPO46eU.jpg


Image: https://i.imgur.com/jk980ls.jpg


Image: https://i.imgur.com/UN98yqF.jpg


Image: https://i.imgur.com/g4K7E6O.jpg





SaDaTayMoses
LSU Fan
Da Platte
Member since Oct 2005
3342 posts

re: Engineers of the OB: Will this bridge support a loaded log truck?
I'd give it a shot. Only 1 way to find out


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690
cgrand
New Orleans Pelicans Fan
HAMMOND
Member since Oct 2009
24300 posts

re: Engineers of the OB: Will this bridge support a loaded log truck?
only one way to find out


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Ole Miss Fan
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Member since Sep 2010
7909 posts

re: Engineers of the OB: Will this bridge support a loaded log truck?
quote:

cgrand


quote:

only one way to find out



And to think that I was actually counting on you for some hard core engineering advice....

I am hoping that you guys will tell me to go for it. And then if the bridge collapses on my log trucks, I'll sue Chicken and take over the site


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241
holmesbr
LSU Fan
Baton Rouge, La.
Member since Feb 2012
1188 posts
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re: Engineers of the OB: Will this bridge support a loaded log truck?
I'm not an engineer but how far on the dirt is that beam or is there a concrete pad/footing there?


Shexter
Prairieville
Member since Feb 2014
7583 posts

re: Engineers of the OB: Will this bridge support a loaded log truck?
I'd try it out with a half loaded log truck first.


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170
habz007
LSU Fan
New Orleans
Member since Nov 2007
2045 posts
 Online 

re: Engineers of the OB: Will this bridge support a loaded log truck?
Looks precarious. Based on the images provided, I’m gonna vote ‘No’

I’d start with even much smaller vehicle and with empty truck first.


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White Bear
USA Fan
NWLA
Member since Jul 2014
6864 posts

re: Engineers of the OB: Will this bridge support a loaded log truck?
Lead vato in pic #1 seems doubtful.


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321
tigerfoot
LA-Monroe Fan
Alexandria
Member since Sep 2006
45930 posts

re: Engineers of the OB: Will this bridge support a loaded log truck?
I am not an engineer, but that big arse beam laying on a support of a wet dirt bank seems to be a liability.


No Colors
Ole Miss Fan
Locker Room
Member since Sep 2010
7909 posts

re: Engineers of the OB: Will this bridge support a loaded log truck?
quote:

how far on the dirt is that beam or is there a concrete pad/footing there?


So far into the dirt that we couldn't find the end of them....I'm guessing 10' on each side. There was some erosion on the near side in the photograph. So we built a form and poured 5 yards of concrete there.


GeauxBichGeaux
Atlanta Braves Fan
Member since Apr 2017
1058 posts

re: Engineers of the OB: Will this bridge support a loaded log truck?
im not an engineer, but ive seen bridges that looked heavier duty than that, that werent rated to hold 80K lbs.


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Tigah D
LSU Fan
Baton Rouge
Member since Jul 2008
1167 posts

re: Engineers of the OB: Will this bridge support a loaded log truck?
I'm an engineer, wouldn't stamp it, but keep us posted on how it goes. Prayers sent for the first loaded log truck driver across


reds on reds on reds
Mandeville
Member since Sep 2013
3102 posts

re: Engineers of the OB: Will this bridge support a loaded log truck?
What size are those I beams? Web/flange/thickness?


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reds on reds on reds
Mandeville
Member since Sep 2013
3102 posts

re: Engineers of the OB: Will this bridge support a loaded log truck?
quote:

I'm an engineer, wouldn't stamp it


Agreed


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upgrayedd
US Space Force Fan
Lifting at Tobin's house
Member since Mar 2013
112838 posts

re: Engineers of the OB: Will this bridge support a loaded log truck?
Your main concern should be how those I beams are connected to the embankment.


YOURADHERE
LSU Fan
Member since Dec 2006
6114 posts
 Online 

re: Engineers of the OB: Will this bridge support a loaded log truck?
I'll join the others by offering my unprofessional opinion of hell nope. Is that a patch panel from a previous bend in the second pic?

Also, I'd be worried about the first truck to hit that thing with muddy tires sliding right off one side, doesn't look very wide.


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60
bbvdd
Alabama Fan
Memphis, TN
Member since Jun 2009
19560 posts

re: Engineers of the OB: Will this bridge support a loaded log truck?
what kind of footing/base are the i-beams sitting on?

In the only picture it looks like they are just sitting on the ground.

If that's all, I'd be scared a log truck would push them in the ground and they could turn.


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LNCHBOX
LSU Fan
70448
Member since Jun 2009
64234 posts
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re: Engineers of the OB: Will this bridge support a loaded log truck?
quote:

Your main concern should be how those I beams are connected to the embankment.




If they've been there since the 40s, I'd have to imagine that they've done as much settling into the earth as they're going to do. But yea, not too sure I'd try driving a loaded log truck over it.

ETA: If those are W12 beams with a 30' span and your estimated load is close, you're not gonna wanna try it.
This post was edited on 10/20 at 1:43 pm


TimeOutdoors
Mississippi St. Fan
Depends on the day
Member since Sep 2014
6306 posts

re: Engineers of the OB: Will this bridge support a loaded log truck?
Did your grandfather put these down when they were logging the land? It looks like the beams are directly under where the wheel load will be?

Personally I would throw in a culvert for the short term until done logging and then remove the culvert (probably would require a permit).


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61
Uncs
LSU Fan
Member since Aug 2008
2879 posts

re: Engineers of the OB: Will this bridge support a loaded log truck?
Coming down that steep in bankment is going to put a lot of force on that initial step onto the bridge. Better go slow


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