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Table 5 Comparison of sectional area.

From: Analysis of Short-Term Prestress Losses in Post-tensioned Structures Using Smart Strands

Structure Area of gross section (mm2) [1] Duct Area of net section (mm2)
[3] = [1]-[2]
Ratio (%)
[3]/[1] × 100
Outer diameter Number Total area (mm2) [2]
Full-scale specimen 1,200,000 89 3 18,663 1,181,337 98.4
Bridge A 1,157,000 106 5 44,124 1,112,876 96.2
Bridge B 966,000 89 a 2 50,745 915,255 94.7
79 a 4
69 b 5
  1. aPrimary prestressing anchored at ends.
  2. bSecondary prestressing anchored at holes of web.