×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

H20 and H20-44

H20 and H20-44

H20 and H20-44

(OP)
any difference between H20 and H20-44?
thanks  

RE: H20 and H20-44

(OP)
sorry, I meant "difference between HS20 and HS20-44"

RE: H20 and H20-44

-44.  Sorry.  Couldn't resist.

If my memory serves me correctly...

With HS20, you have a 20 ton vehicle with 4 tons on the front axle, and 16 tons on the rear dual or single axle combination. I would have to look at the sketch to see the distance between axles.

With the HS20-44, you have a 44 foot overall length, 14 foot tractor and a 30 foot trailer, with 4 tons on the front axle and 8 tons on the rear of the tractor at the hitch, and 8 tons on the rear axle.  There are tweeks to this arrangement too.

You can verify this either with AASHTO or the 1963 California Highway Design Manual.  I know - dating myself here.     

 

Mike McCann
MMC Engineering

 

RE: H20 and H20-44

There's H20-44 and HS20-44.

In both cases the "44" stands for 1944, the year the loading was adopted.

H20 truck is a 20T truck; two axles, 4T & 16T, spaced at 14'.

HS20 is a 36T truck  It's the H20 truck with an additional 16T axle with a variable spacing of 14' to 30', whichever produces maximum stress.

RE: H20 and H20-44

Never really done bridge work before but here is a question.

Is this the loading used to design bridges today?  If I remember correctly, you can increase and decrease the load proportionally to allow for larger vehicles.  Is H20-44 and HS20-44 the load used most often to design bridges today?

RE: H20 and H20-44

1) H20 and H20-44 maybe the same thing.  But you'd better check because H20-44 looks like a typo where "HS20-44" was meant.

2) HS20 was the standard AASHTO loading that consisted of the truck or the lane load.  The LRFD HL-93 is the LRFD AASHTO loading.

 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources