You are not logged in or registered. Please login or register to use the full functionality of this board...


Bridge weight limits
#11

It's the shock load that works on bridges - the jarring, bouncing ect which is a direct result of the suspension ( or lack of ). Same effect when the 150 lb teenager "plops" down on the step of the coach - the step is feeling more the effect of 300lbs.

marc & shari popejoy
western Oklahoma
1987 Newell #135
Reply
#12

Good post Marc.

More Technical: Bridge design involves dead loads, live loads, stress, tension, shear, impact forces, vibration, harmonics and environmental conditions such as temperature, humidity (primarily wooden bridges), wind speed and currents.

Slowing down reduces impact forces and vibration.

Michael Day
1992 Newell 43.5' #281
NewellOwner.com
Reply
#13

This helps illustrate dynamic force. Link to video at bottom.
Subject: FW: To my engineering and construction friends



Engineering Made Easy !

A short video of a Pakistani pile driving construction technique. Notice that the pile driving only becomes effective when the extra man jumps on. Very finely tuned! The chant is also catchy!

If you want to analyze the engineering here:

6 men x 180 lbs = 1080 lbs static force. Jumping up and downwill create a 3 times dynamic effect = 3240 lbs/jump = 1.6 ton thumps.

If the pile is tapered to 2 in x 2 in, cross section at the tip = 4 square inches. So, dynamic pressure/thump at pile tip = 3240/4 = 800 psi.


"Add a man" feature will increase to 950 psi, so buy the option !


Increase the chant and dynamic force goes up to 5 times to bring max.pressure/thump to 1600 psi for a 7 man team.


Quite good and will penetrate hard clay and sandy soil but not hard rock!


Pretty ingenious AND doesn't cost a whole lot!

Click on the link for video.



Perhaps if this technique was used, the veterans hospital construction project in Denver wouldn’t be a billion dollars over budget.






https://www.youtube-nocookie.com/embed/c...Kypg?rel=0
Reply
#14

So Kool cc!!! I love it. No gym memberships needed either!! It would only take 2 or 3 if they were my size! I might struggle to get "in the rhythm" though.

1993 Newell (316) 45' 8V92,towing an Imperial open trailer or RnR custom built enclosed trailer. FMCA#232958 '67 Airstream Overlander 27' '67GTO,'76TransAm,'52Chevy panel, 2000 Corvette "Lingenfelter"modified, '23 Grand Cherokee.
Reply
#15

HaHa!!!!

Forest & Cindy Olivier
1987 log cabin
2011 Roadtrek C210P
PO 1999 Foretravel 36'
1998 Newell 45' #486 

1993 Newell 39' #337 
Reply
#16

I actually said something intelligent.. Don't tell my wife she will expect it more often..

Marc Newman
Formerly Newell 422, 507, 512 701


Reply
#17

I'm wondering what this weight limit sign means in practical terms... In other words, I'm wondering if this kind of bridge would be ok to cross in 65,000 lb tag newell if I'm the only vehicle on bridge?  It's about 80' long.  It has this sign both directions so I would assume that 3 axles could weigh up to 46 tons (assuming only one vehicle on bridge as opposed to two 23 ton vehicles).  Any guru thoughts on this?  


I'm planning on visiting my friends ranch and would have to cross this bridge.  


Attached Files Thumbnail(s)
   

Jason 
-----------------------------
Previous owner of 2013 #1472
Previous 2003 #665 triple slide
1 wife
2 kids
Lots of stuff
Reply
#18

Where you going Jason?

Marc Newman
Formerly Newell 422, 507, 512 701


Reply
#19

Just south of Osawatamie, KS. I always seem to be on these little two lane roads!

Jason 
-----------------------------
Previous owner of 2013 #1472
Previous 2003 #665 triple slide
1 wife
2 kids
Lots of stuff
Reply
#20

Most bridges are made to support the weight of a fire truck laden with water which probably weighs about the same as our coaches (or more), don't take my word for it, this is merely speculation. If it is in an old town and is an old bridge I would avoid it if possible.

Karen & Adrian Abshire 
1998 2 slide 45' Newell Coach 498 
Prior: 1985 Foretravel ORED 35, 1988 38' Foretravel U280, 2000 Foretravel 42' U320, 1990 Bluebird Wanderlodge WB40
Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)