AASHTO Lane Load
AASHTO Lane Load
(OP)
Hello. I had a question about the impact factors applied to AASHTO loads.
They are applied for the truck loads but are they also applied for the lane load, (18k and 0.64 klf for moment and 24k with 0.64klf for shear)?
The AASHTO code specifies the impact loads because of the effect of moving vehicles, but does the single concentrated load also have the same effect?
It does say the lane load is based on a series of slowly moving trucks but I'm not sure whether to apply the impact factor to the lane load also.
Thank you.
They are applied for the truck loads but are they also applied for the lane load, (18k and 0.64 klf for moment and 24k with 0.64klf for shear)?
The AASHTO code specifies the impact loads because of the effect of moving vehicles, but does the single concentrated load also have the same effect?
It does say the lane load is based on a series of slowly moving trucks but I'm not sure whether to apply the impact factor to the lane load also.
Thank you.






RE: AASHTO Lane Load
"...The dynamic load allowance shall not be applied to pedestrian loads or to the design lane load."
Maine EIT, Civil/Structural.
RE: AASHTO Lane Load
RE: AASHTO Lane Load
RE: AASHTO Lane Load
RE: AASHTO Lane Load
I was referring to the 17th edition because we were analyzing design loads for an older bridge and calculating the difference between the old loads and current HL-93 loading scenarios.
Current AASHTO LRFD code does spell out the procedure more clearly.
@mike - Thanks. I thought as much but wasn't sure of the reasoning behind it. The 18k and 24 k were concentrated loads in addition to the uniform lane loads. They are, as yakpol pointed out, from the 2002 edition. They were analyzed in the manner you outlined.
RE: AASHTO Lane Load
RE: AASHTO Lane Load
RE: AASHTO Lane Load
http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_w...