×
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

Crack Width of Partially Prestressed Concrete

Crack Width of Partially Prestressed Concrete

Crack Width of Partially Prestressed Concrete

(OP)
Hi guys, i am doing a thesis on partially prestressed concrete beams and can't seem to predict the crack widths of my beam. Could anyone point me to the right direction and tell me where i could find a formula for the crack width of partially prestressed concrete? The examples that i did ended up giving me a crack width with a minus sign, which i think must be the wrong answer?

RE: Crack Width of Partially Prestressed Concrete

Some information might be helpful, like which design code.

Eurocode has a reasonable method.

RE: Crack Width of Partially Prestressed Concrete

Before doing a cracked analysis you should do an uncracked analysis to make sure there is enough load to crack the beam.

As a start some older classic papers on the subject are,

"Steel Stresses in Partially Prestressed Concrete Members", K.M. Suri, W.H. Dilger, PCI Journal, Vol. 31, No. 3, May-Jun 1986, pp 88-112

"Crack Width of Partially Prestressed Concrete Members", K.M. Suri, W.H. Dilger, ACI Journal, Vol. 83, No. 5, Sep-Oct 1986, pp 784-797

"Analysis of Cracked Prestressed Concrete Sections: A Practical Approach", R. Mast, PCI Journal, Vol. 43, No. 4, Jul-Aug 1998, pp 80-91

There are many others. PCI papers can be found for free on the PCI web site.

RE: Crack Width of Partially Prestressed Concrete

Prestressed concrete in most of the world is considered to have no tensile strength, the same as reinforced concrete.

So if it is in tension, it is cracked.

Many codes provide a tension limit that allows a deemed to comply check on cracking, so if the tension is below this limit, the crack widths are assumed to be ok without further calculation, but the concrete is still assumed to be cracked if it is in tension.

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