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Live load differnces

Live load differnces

Live load differnces

(OP)
What is the difference between H-20 traffic load and HS-20 traffic load? The size and weight of the truck?

Richard A. Cornelius, P.E.
WWW.amlinereast.com

RE: Live load differnces

H-20 is an 8k axle and a 32k axle, spaced at 14'
H-20 adds another 32k axle, with a variable spacing of 14' to 30'.

If you're not designing a bridge, use a 16k wheel load, plus impact if necessary.

RE: Live load differnces

(OP)
OK. Thanks. We are designing liners for pipes under roads. I will continue to use the HS-20 unless they ask for the HS-25.

Richard A. Cornelius, P.E.
WWW.amlinereast.com

RE: Live load differnces

(OP)
We also get a few DOT's that want an HL-93. Isn't that a bridge slab design?

Richard A. Cornelius, P.E.
WWW.amlinereast.com

RE: Live load differnces

HS-25 is HS-20 +25%.

HL-93 is a bridge loading using the LRFD specs. It's an HS-20 truck + 640plf of uniform load spread over a 10' width. Whether you would apply the lane load in your situation is a matter of DOT policy. I designed some oddball drainage structures recently and we weren't required to use it. I would believe for a pipe under a road the lane load wouldn't be used.

RE: Live load differnces

(OP)
Thanks again. Each DOT I deal with has a different idea for me.

Richard A. Cornelius, P.E.
WWW.amlinereast.com

RE: Live load differnces

you're quite welcome.

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