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RE: AASHTO Loadings

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The MS-18 loading is the metric version of the HS-20 loading.
Total Truck weight = 72kip or 322kN
Lane load = 0.640klf with conc. Load of 18kip (for moment)
Or 9.34kN/m with conc. Load of 80kN (for moment)

You will find the detailed (english) version of the HS-20 loading in the
AASTHO standard specifications. Or Caltrans has created an almost
identical bridge design specification. Check

A metric summary with axle layout you can find at

I hope that helps,
Oliver Mueller, P.E. 
Bridge Engineer 
565 Burbank Street
Broomfield, CO 80020 

From: "Thor Tandy" <vicpeng(--nospam--at)>
To: "SEAINT" <seaint(--nospam--at)>
Subject: AASHTO Loadings

Hi.  My turn to ask a favour :^)

Would someone be kind enough send me the wheel layout & loads for the =
AASHTO MS-18 loading?  I'm hunting the internet but haven't found the =
source yet.


Thor A. Tandy P.Eng
Victoria BC

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