how truck load, axle loads or wheel load are used

huangyhg

how truck load, axle loads or wheel load are used?
i m a civil engineer and did structural design for buildings but never used truks loads. now i have to design and submit structural calculation for joint bays for underground power cables alongside the roads. the local code requirements are to design joint bays for "36 ton truck to pass over and axle load of 12.5 tons."
i want to know how to use this load in joint bays walls, base slab and precast concrete covers design?
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this really sounds like you want awful lot.  i suggest that you speak with your supervisor or mentor.
obviously more information is needed to assist you but you're really asking for us to actually figure this out on minimal info and render a structural load arrangement.
chances are your 36 ton truck isn't going to fit over the entire precast chamber so you need to find out what will fit over the chamber and put the most heavily loaded axle over it.  if the chamber is actually below the ground level where the actual tire load is applied then you need to determine the stress distribution from at least one wheel and see if the other wheel will also influence the load on the chamber as well.  once that is done you have a pressure diagram acting on the top of the chamber.  if the wheel can be applied directly to the chamber then you have only a single point load to apply to the top of the chamber.  from this point it's all statics in transferring the load down to the soil.
regards,
qshake
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the loads you refer to sound as if they come from the aashto standard specifications.  you need to consult a bridge engineer to explain this.  if your vault or whatever is fairly small, you will only have one tire loading your underground structure.  good luck.
sounds like an h-14 asshto load.
richard a. cornelius, p.e.
sorry h-15 not h-14.
richard a. cornelius, p.e.
check the state d.o.t. for local roadway/culvert design manuals.