Empty Weight of Trucks
Empty Weight of Trucks
(OP)
Can anyone tell me what the empty axle weights of a standard 3, 3S2, 3-3 and H20 Truck?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Empty Weight of Trucks
I am ready to be corrected, but..
The trucks that you list are all 'design' vehicles. That is, they are basically mathematical fictions (and not actual vehicles), specified for the single purpose of establishing acceptable design loadings for bridges or whatever.
For the purpose that they have been specified, there would be no point in indicating a set of 'unloaded vehicle loads'. For engineering design purposes, one would either assume the presence of a vehicle loaded to its full design value, or no vehicle at all. The in-between case of partly loaded vehicles would not usually be relevant.
If you want to know actual vehicle masses, I suggest that you look elsewhere.
RE: Empty Weight of Trucks
While I was aware of the fact that HS20 is a theoretical truck, I thought 3, 3s2 and 3-3 were the wheel configuration of actual trucks. Thanks for the info. Otherwise I would have been running in circles.
RE: Empty Weight of Trucks
Surely you have to get back to your clients and demand clear definition of the axle loads which they intend to use?
RE: Empty Weight of Trucks
You may concider impact.
RE: Empty Weight of Trucks
By inspection, you can't use a HS vehicle as the axle load is 32kips or 16 tons and this is without impact. Most states will require impact unless the speed is somewhere around 5-10 mph. Using the HS vehicle would give you, in my opinion, blanket approval, if it worked for all vehicles as it is a fictional truck designed to effect the maximum load.
For other truck weights I suggest that you contact some of the truck manufacturers or concrete delivery folks - you may want to have them stop at a weight station if one is close enough by.
It will be very hard to inventory this and even more so to enforce the load limit. I also hope there is a nice, warm and fuzzy safety factor in the 11 tons.
RE: Empty Weight of Trucks
You might JUST consider installing an access ramp to your wharf, over which all trucks would have to pass, and which would deflect excessively (sounding a LOUD limit-switched alarm) under a 11 ton axle. With modern technology, you might possibly arrange for the alarm to shout at the driver "Get that x#@*~! truck off my wharf".
RE: Empty Weight of Trucks
HS: 24 Tons
H: 13 Tons
Type 3: statutory vehicle (25 tons) has maxim axle load of 8.5 tons (but 2 are only 4 feet apart)
Type 3S2: statutory vehicle (36 tons) has maxim axle load of 7.75 tons (but 2 are only 4 feet apart)
Type 3-3 statutory vehicle (40 tons) has maxim axle load of 8 tons (but 2 other 7 ton axles are 4 feet apart)
It is true that these are fictitious design vehicles, but DOTs Post bridges this way all of the time. The way you come up with the maximum truck load is by using the following equation:
Posted Weight = (Allowable axle load / Maximum design vehicle axle load) x Design Vehicle weight
This assumes that you will only get one axle on the bridge at a time. If more than one axle is on the bridge, the analysis becomes more complicated.
The AASHTO Manual for Condition Evaluation of Bridges has a handy table that gives you the Live Load Moment due to all 5 types of trucks listed above on a longitudinal stringer for simple spans ranging from 5 to 300 feet. This table takes into account the effect of multiple axles on the bridge
I hope this helps
RE: Empty Weight of Trucks
Alternatives of Strengthening the wharf is not feasible due to the cost. Only other alternative would be to barge in/out the material.
Any ideas?
RE: Empty Weight of Trucks
If the contractor is serious about using the trucks to haul materials then weighing the actual trucks in use would be well worth the time and expense - no one, especially you and your employer, wants a collapsed wharf. Otherwise, use the barge. If the contractor needs to know if it is possible, then get them to weigh each truck they plan to use to determine axle loads, and then limit the loads such that axles do not surpass the 11 ton limit.
~dison
RE: Empty Weight of Trucks
If I may; who owns the warf? Who determined that it was OK for an 11 ton vehicle? They may have information you should consider before you get back to the client with a final answer.
Finally, you may want to consider a make shift weigh station to protect you in this case, although if an overweight truck collapses the warf, he won't be able to leave the area before you get a chance to have him weighed.
RE: Empty Weight of Trucks
http://www.structural.net/Presentations/WOC%2002%20FRP_files/slide0451.htm
what is the guy writing down?...oh boss, well you see...
RE: Empty Weight of Trucks
The advantage is that you will have a record of each truck so that if after the job there is any question if the wharf was overloaded then you can demonstrate due diligence in keeping the weights within the allowable.
If you are looking for a number for bidding purposes, most truckers know their tare weight.(i.e. empty truck) you can then calculate the number of deliveries needed for the volume of material
Rick Kitson MBA P.Eng
Construction Project Management
From conception to completion
www.kitsonengineering.com
RE: Empty Weight of Trucks
You also propose another good alternate that is available. Barging. I've worked on many jobs where barging was the an alternative and it worked to everyone's satisfaction. Of course, this assumes that you already have a tug handy. All the jobs I had did so it was just a little more scheduling for the day of the big pour/delivery etc.