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
Eurocode has a reasonable method.
RE: Crack Width of Partially Prestressed Concrete
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
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.