24.02.2017 Views

Structural Concrete - Hassoun

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

19.4 Analysis of Flexural Members 751<br />

e. The total loss is 27.4 + 7 (elastic loss) = 34.4 ksi. The percentage of total loss is<br />

f. Prestress stresses are<br />

34.4<br />

175 = 19.7%<br />

F i = 175 − 7 = 168 ksi<br />

F = 175 − 34.4 = 140.6ksi<br />

F = ηF i<br />

η = time − dependent loss ratio<br />

= 140.6<br />

168 = 0.837<br />

(at transfer)<br />

Figure 19.6a Example 19.4.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!