×
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

DISTRIBUTION FACTOR-BRIDGE DESIGN

DISTRIBUTION FACTOR-BRIDGE DESIGN

DISTRIBUTION FACTOR-BRIDGE DESIGN

(OP)
when we design stringers for bridge as per AASHTO, depending upon the spacing of stringers, we calculate the distribution factor to be multiplied with load to obtain required design data to design stringers. Does any one has idea that why this Dist. factor is different for moment and shear.To me this number only tells how much portion of load a stringer will take and than we can calculate max shear and moment. so # should be same?
Also anyone has idea that why skewed bridges are weak in shear?

RE: DISTRIBUTION FACTOR-BRIDGE DESIGN

Many years ago, B.C. (before computers)the distribution for shear was the same as the distribution for moment, excepting for the end reactions.  The 60's AASHO (not AASHTO)standard specifications book was a fifth of the size of the current standards.  Research is the result of many of the changes, although they carry many of the new factors out to the 6th decimal place.
Best, Tincan.

RE: DISTRIBUTION FACTOR-BRIDGE DESIGN

Plainsboro,
Different distribution factors for shear and moment reflect location of the vehicle in the span to maximize the forces. For maximum shear truck is located close to the end of the girder (small distribution length - larger distribution factor), for maximum moment in midspan (smaller distribution factor). If to look for moment and shear in midspan then moment distribution factor is the correct for both.

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