×
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

Two Span Continuous Beam Analysis

Two Span Continuous Beam Analysis

Two Span Continuous Beam Analysis

(OP)
Is there a reference for the design moments and shears resulting from 1) A distributed load and 2) Two equal concentrated loads (moving) on a two span continuous beam? The spans for my case are equal.

I did some searching around and haven't found anything. This seems so basic I just thought there'd be a simple envelope diagram with coefficients or something to find the moment and shear envelopes.

Cheers!

RE: Two Span Continuous Beam Analysis

(OP)
I suppose all I'd be looking for is the concentrated moving loads case. The uniform load case is readily available.

RE: Two Span Continuous Beam Analysis

I've got a book by AISC from 1959 that has tables for 2, 3 and 4 spans with AASHTO truck loads on it.
But not with just two concentrated loads.

Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies

RE: Two Span Continuous Beam Analysis

The NDS Beam Design Formulas design aid has a figure for a single concentrated load on any point of a two equal span continuous beam (Fig #28). That might be enough to get you started.

RE: Two Span Continuous Beam Analysis

You will need to generate influence lines for shear and moment for the moving load case. There are some tables from AASHTO available for typical continuous bridge types, just as JAE mentioned.

RE: Two Span Continuous Beam Analysis

The influence lines will tell you how to apply the load and the resulting moments and shears.

RE: Two Span Continuous Beam Analysis

I believe the 1963 California Bridge Design Manual has a very helpful table for this loading in the back.

Mike McCann, PE, SE (WA)


RE: Two Span Continuous Beam Analysis

google "three moment equation"

another day in paradise, or is paradise one day closer ?

RE: Two Span Continuous Beam Analysis

Charts and tables are nice but is it really that difficult to generate influence lines? It can be done in 10 minutes or less on programs similar to STAAD or RISA 3D (when I was in bridge design in school we used RISA 2D). If you have Virtis/Opis, it will generate them for you.

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