Shrinkage loss

2 posts / 0 new
Last post
AnayRN
Shrinkage loss

Dear All

I am modeling a prestressed cored slab bridge and looking for the prestress losses. I have found that the shrinkage loss at the final stage uses the strain at the initial stage (Transfer stage). For example I have got the following numbers"

1. Time dependent losses between transfer and hauling [5.9.3.4.2]
[5.9.3.4.2a] Shrinkage of Girder Concrete : DfpSRH = 1.575 ksi

2. Time dependent losses between transfer and hauling [5.9.3.4.2]
[5.9.3.4.2a] Shrinkage of Girder Concrete : DfpSRH = 5.835 ksi

3. Time dependent losses from installation of precast member to final time
[5.9.3.4.3, 5.9.3.4.4]
[5.9.3.4.3a] Shrinkage of Girder Concrete : DfpSD = 1.534 ksi ?????

Does that sound right?

Thanks

Rick Brice
Shrinkage loss

Sounds right!

You are listing an increment of prestress loss between girder erection and final. Most of the girder shrinkage happens during early age so you'd expect the late age increment to be smaller.

If you look at the calculation details you'll see that the strain used to compute the erection to final loss is e_bdf = e_bif - e_bid which is the difference in strain between final and erection.

Log in or register to post comments