Discussion: View Thread

  • 1.  Pavement failure

    Posted 01-15-2019 08:05 AM
    Edited by Tirza Austin 01-15-2019 08:04 AM
    There had been so many discussions on the damage to pavement by overloading. I have a basic suggestion.

    1. Please weigh a fully loaded two axle truck on a weigh bridge.
    2. Please weigh a fully loaded three axle truck on a weigh bridge.
    3. Please weigh a fully loaded multi-axle truck of most common type.
    4. Then weigh the individual axles of the all the above trucks.
    5. Prepare a graph for comparison of individual axle loads with the total weight of the truck.
    6. Then we can think of basis of 8.2T standard axle load.

    Over time the truck and loading types have changed. Most of the truck engines are capable of hauling
    heavy loads. But the number of axles have also increased. Thus 8.2T may not be correct scenario now.

    Partha Aich
    M ASCE


  • 2.  RE: Pavement failure

    Posted 01-17-2019 05:42 PM
    Edited by Tirza Austin 01-17-2019 05:42 PM
    That's for the national transportation authority to do. In the late 70's a research, of similar objective, was carried out by the Ministry of Transportation of Ontario (MTO). A large and highly qualified research team checked various existing axial configurations; ran computer analysis for various bridge configurations to find an equivalent simplified truck load. It was shown in Ontario Highway Bridge Design Code (OHBDC). If I remember correctly, it was a 5 axel truck with 700 KN (78 T) total load. And for bridge evaluation loads there were 3 axel configuration and 4 axel configuration with loads determined by the Highway Class. Later the OHBDC was adapted as the highway bridge standard for Canada.

    I'm not sure how the trucks of today compare with the above. If an upgrade was needed, it should follow a similar procedure.

    I have been away from AASHTO for a while. Any recent revisions?

    ------------------------------
    Neil Kazen, M.Eng., M.Sc., P.Eng.
    FASCE, FCPCI, FEC,
    Retired Structural Engineering Manager, Transportation Division, SNC-Lavalin
    Toronto, Ontario, Canada
    ------------------------------



  • 3.  RE: Pavement failure

    Posted 01-20-2019 09:14 AM
    Edited by Tirza Austin 01-20-2019 09:14 AM
    Partha, 

    8.2 tons are actually the single axle load not the total weight of the truck or commercial vehicle. 

    Regards, 

    ------------------------------
    Ejaz Khan S.M.ASCE
    Director
    Pakhtunkhawa Highways Authority
    Islamabad
    ------------------------------



  • 4.  RE: Pavement failure

    Posted 01-20-2019 11:15 PM
    Edited by Tirza Austin 01-20-2019 11:14 PM
    Mr. Ejaz Khan, 

    I know that 8.2T is per axle. That is why massive loads are hauled by multi-axle trucks, which often
    reduces the per axle load to less than 8.2T. Even this varies axle to axle depending on the positioning
    of the load.

    Regards,

    Partha


    On Sun, 20 Jan 2019 19:46:31 +0530 "Ejaz Khan via ASCE Collaborate" <mail@...> wrote
    >






    Partha,  8.2 tons are actually the single axle load not the total weight of the truck or commercial
    vehicle.  Regards,  -----------------------...
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    Jan 20, 2019 9:14 AM




    Ejaz Ahmad Khan















    Partha, 
    >
    >8.2 tons are actually the single axle load not the total weight of the truck or commercial vehicle. 
    >
    >Regards, 
    >
    >------------------------------
    >Ejaz Khan S.M.ASCE
    >Director
    >Pakhtunkhawa Highways Authority
    >Islamabad
    >------------------------------
    >-------------------------------------------
    >Original Message:
    >Sent: 01-14-2019 23:20
    >From: Partha Aich
    >Subject: Pavement failure
    >
    >
    There had been so many discussions on the damage to pavement by overloading. I have a basic suggestion.
    >
    > 1. Please weigh a fully loaded two axle truck on a weigh bridge.
    > 2. Please weigh a fully loaded three axle truck on a weigh bridge.
    > 3. Please weigh a fully loaded multi-axle truck of most common type.
    > 4. Then weigh the individual axles of the all the above trucks.
    > 5. Prepare a graph for comparison of individual axle loads with the total weight of the truck.
    > 6. Then we can think of basis of 8.2T standard axle load.
    >
    > Over time the truck and loading types have changed. Most of the truck engines are capable of hauling
    > heavy loads. But the number of axles have also increased. Thus 8.2T may not be correct scenario now.
    >
    > Partha Aich
    > M ASCE









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