What about constructing 2 No concrete foundation walls 3.60 Mt x 0.60Mt wide
You could span between with 6 No steel beams in parallel - UB 254 X 146 X 43Kg (10 x 6 ins approx)
Beams would be 5.20 Mt long (225Kg) - with a bearing on concrete walls of 0.60 Mt - endplates bolted to wall
For the deck you could use 8/10mm chequer plate (2.50Mt x 1.25 Mt) bolted to beams
Ideally steel would be galvanized - shot blasted primed & painted with quality oxide paint could be considered
Steel layout to focus on wheel tracks & decking plate joints on beam centre lines etc
Not sure what loads are
Reg POD
load table for you ....
loadings are in KN....
1 KN =102kgs
the difference between 5m and 5.5m is circa 10KN so knock off say 4-5KN to give a reasonable 5.2m loading
these loads are for
Uniformly
Distributed
Loads over the entire span
between bearings, per beam ....
for point loading at the ctr halve the figures.
also include the weights of the deck plates as part of the load exerted ....
bear in mind that the deck plates will not necessarily spread the loading across beams as they would be too flexible.
so UDL over each beam = 120KN .... x 6 for all your beams, so 720KN,less the deck plate's weights, then halve it at the centre of the span for the point load that the front/rear axle will exert, from the vehicle entering/exiting the bridge deck.
if you use 6 equally spaced apart, the beams directly below the wheels will take the most load. if you wanted to pair up two beams per wheel base, they really need welding together to guarantee decent load sharing and have the other two at the edges of the bridge.
bolting the deck plates on will give virtually zero in the way of load transfer to the beams, unless the weight is directly exerted on top of the beams .... welding the plates to the beam'd help the sharing
