How to calculate the prestress losses in multistage post-tensioned beam?

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Based on structural efficiency, what is the effect on post-tensioning system by using precast and CIP concrete ?Related to creep or shrinkage?

difference in structural effect on post-tensioning system by using precast and CIP concrete?

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What is the ultimate creep and shrinkage coefficient prescribed by British standard for the post-tensioning?

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For segmental construction, the second prestressing work will affect the first applied prestress force ?In term of what? Increased prestress loss?

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Ghulam Sarwar Shaikh

following paper and links may be useful

http://preserve.lehigh.edu/cgi/viewcontent.cgi?article=3154&context=engr-civil-environmental-fritz-lab-reports

https://www.google.com.pk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwiGifPA0NzLAhUBOhoKHYfqAvMQFggiMAE&url=http%3A%2F%2Fdigital.lib.lehigh.edu%2Ffritz%2Fpdf%2F470_1.pdf&usg=AFQjCNHLBU94i6SLi4kUuLyqy6UdmSW7eA&sig2=dEvgpKCs7q_7re3pxgRf2w

https://www.google.com.pk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=0ahUKEwiGifPA0NzLAhUBOhoKHYfqAvMQFggyMAM&url=http%3A%2F%2Fwww.slideshare.net%2FManjuParanthaman%2F7-losses-in-prestress&usg=AFQjCNEOlXS_G3y5UWdjqobCnb92Wye3MA&sig2=1EG9zL2qVjVYTH2TPWn9QQ

Will Chow

Sir,thank you for your answer. Do you have any related information on the design procedure of multistage post-tensioning?