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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.