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H20 Wheel load

H20 Wheel load

H20 Wheel load

(OP)
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  

RE: H20 Wheel load

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
 

RE: H20 Wheel load

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.

RE: H20 Wheel load

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.

RE: H20 Wheel load

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.  

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