H20 Wheel load

[Yihan]

I am doing a culvert span 3.5 meters, I have to limit the top slab thickness to 280mm ( no haunch possible ), it is 600 mm bury depth, H20 traffic load.
the wheel transvers spacing is 1800mm per ASShto,
since the span is 3.5m, that means I have to put 32Kipsx1.3(dynamic factor)x1.5(live load factor)=62.4 kips load on to the roof slab. this will creat fairly large moment and shear onto the slab, is this over designed?

thanks

 

[msquared48]

No, but remember that you can spread out the load over a larger area than the contact area of the wheel at the top of the paving.

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[Dinosaur]

The 32 kips is an axle load, not a wheel load. The two wheels are spaced a little over 1800mm transverse. I believe there is also a "design tandem" that you should analyze too. This is four smaller wheel loads instead of two larger ones.

 

[Quanski]

The load factors are acceptable. I am a Canadian engineer but I imagine ASSHTO code would be similar and has provisions for proper load distribution.

 

[cap4000]

Try to get a copy of the Concrete Pipe Design Manual. It has load tables #49 thru 55 set up for pipe which would be similar to your case.

 

[a8d2b]

Here is a .pdf link of the concrete pipe manual. It is a pretty good resource.

http://www.concrete-pipe.org/pages/design-manual.html