In prestressing work, if more than one wire or strand is included in the same duct, why should all wires/strands be stressed at the same time?

If wires/strands are stressed individually inside the same duct, then those stressed strand/wires will bear against those unstressed ones and trap them. Therefore, the friction of the trapped wires is high and is undesirable.

This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

2 comments on "In prestressing work, if more than one wire or strand is included in the same duct, why should all wires/strands be stressed at the same time?"

SAMEER KHAN says:

February 2, 2013 at 1:21 pm

If the steel wires would stressed individually it will cause crakes in the structure. so its necessary to make stressing of wires at a time,

Vijay Keshari says:

April 21, 2018 at 3:30 am

Dear sir plz make for bar bending schedule formula find

In prestressing work, if more than one wire or strand is included in the same duct, why should all wires/strands be stressed at the same time?