Prestressed Concrete Beam

[macan1]

Subject: Prestressed Concrete Beam (girder) in dunnage.
Top of girder is in tension.
How do we design longitudinal regular rebars (non-prestressed rebars) to resist the tension stress at top flange, need references / link.
Thanks.

 

[briancpotter]

There's an example of this in the 7th edition of the PCI handbook (and probably earlier editions, but that's what I have in front of me.) 5.2.2.4, pg. 5-24

It's relatively simple. Find your max tensile stress, use this combined with neutral axis depth to calculate the total tension force, and provide sufficient steel to resist it.

Brian C Potter, PE

http://simplesupports.wordpress.com