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Table 3 Stresses, strains and ductility factors for the unwrapped columns (UW) and columns in Groups 1–4 (1 MPa = 0.145 ksi).

From: Concentrically Loaded Circular RC Columns Partially Confined with FRP

Group#a

Columnsa

UW

S1

S2

S3

S4

S5

S6

S7

FW

1

\( f^{\prime}_{cc} \) (MPa)

22.13

22.32

23.51

26.22

27.81

29.23

33.18

35.24

48.80

\( \varepsilon_{ccu} \)

0.0025

0.0068

0.0076

0.0102

0.0120

0.0126

0.0171

0.0195

0.0303

\( \varepsilon_{lu} \)

0.003

0.0035

0.0055

0.0061

0.0070

0.0089

0.0102

0.0179

\( f^{\prime}_{cc} /f^{\prime}_{c} \)

1.079

1.070

1.137

1.268

1.345

1.414

1.604

1.704

2.360

\( \varepsilon_{ccu} /\varepsilon^{\prime}_{c} \)

1.266

3.390

3.808

5.088

5.995

6.321

8.562

9.741

15.166

\( \mu \)

5.744

6.357

6.952

8.422

9.215

9.219

10.269

11.266

14.327

2

\( f^{\prime}_{cc} \) (MPa)

55.20

55.22

57.52

28.35

59.86

62.35

63.39

68.06

78.27

\( \varepsilon_{ccu} \)

0.0028

0.0058

0.0065

0.0066

0.0074

0.0098

0.0104

0.0135

0.0154

\( \varepsilon_{lu} \)

0.0021

0.0025

0.0029

0.0032

0.0044

0.0045

0.0068

0.0077

\( f^{\prime}_{cc} /f^{\prime}_{c} \)

1.001

1.001

1.043

1.058

1.085

1.130

1.149

1.234

1.419

\( \varepsilon_{ccu} /\varepsilon^{\prime}_{c} \)

1.083

2.267

2.534

2.580

2.903

3.840

4.062

5.273

6.036

\( \mu \)

3.53

3.552

3.970

4.041

6.177

6.762

6.915

7.087

7.339

3

\( f^{\prime}_{cc} \) (MPa)

23.89

24.55

24.78

26.65

28.80

28.83

32.04

35.99

49.79

\( \varepsilon_{ccu} \)

0.0051

0.0066

0.0070

0.0083

0.0084

0.0106

0.0157

0.0173

0.0294

\( \varepsilon_{lu} \)

0.0023

0.0028

0.0035

0.0044

0.0052

0.0077

0.0096

0.0178

\( f^{\prime}_{cc} /f^{\prime}_{c} \)

1.155

1.187

1.198

1.289

1.393

1.394

1.549

1.740

2.408

\( \varepsilon_{ccu} /\varepsilon^{\prime}_{c} \)

2.554

3.313

3.491

4.129

4.194

5.309

7.841

8.650

14.717

\( \mu \)

5.674

5.796

5.813

6.446

6.983

7.315

9.271

9.765

13.426

4

\( f^{\prime}_{cc} \) (MPa)

22.2

22.38

25.02

26.22

27.31

29.89

32.54

36.16

48.49

\( \varepsilon_{ccu} \)

0.0028

0.0066

0.0072

0.0096

0.0108

0.0122

0.0150

0.0193

0.0307

\( \varepsilon_{lu} \)

0.0031

0.0033

0.0053

0.0056

0.0067

0.0088

0.0113

0.0187

\( f^{\prime}_{cc} /f^{\prime}_{c} \)

1.074

1.082

1.210

1.268

1.320

1.445

1.573

1.749

2.345

\( \varepsilon_{ccu} /\varepsilon^{\prime}_{c} \)

1.384

3.323

3.618

4.795

5.391

6.082

7.527

9.637

15.374

\( \mu \)

5.972

6.205

6.231

7.918

8.415

9.206

10.026

10.697

14.155

  1. aRefer to Tables 1 and 2, and Fig. 2 for column dimensions and properties.