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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.