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International Journal of Concrete Structures and Materials

Table 4 Feature values of each cluster (pull-out data set).

From: Development of Mapping Function to Estimate Bond–Slip and Bond Strength of RC Beams Using Genetic Programming

Pull-out

Cluster

\(f^{\prime}_{{\text{c}}}\)(MPa)

c (mm)

\(d_{{\text{b}}}\)

(mm)

\(c/d_{{\text{b}}}\)

\(A_{{{\text{st1}}}} /S_{{{\text{st}}}}\)

\(\tau_{{\text{p,max}}}\)(MPa)

1

26

68

23

2.9

0.3

12

2

26

29

14

2.1

0.1

12

3

116

70

16

4.4

0.0

36

4

26

70

14

5.0

0.0

14

  1. The feature values ​​are presented as the mean within the cluster
  2. Underlined values ​​indicate the feature values of clusters with the highest and lowest \(\tau_{{p, {\text{max}}}}\)
  3. \(A_{{{\text{st1}}}}\): cross-sectional area of one leg of transverse reinforcement (mm2), \(S_{{{\text{st}}}}\): spacing of transverse reinforcement (mm), \( c \): compressive strength of concrete (MPa), \(d_{{\text{b}}}\): diameter of rebar (mm), \(f^{\prime}_{{\text{c}}}\): compressive strength of concrete (MPa), \(\tau_{{p, {\text{max}}}}\) maximum bond stress of a pullout specimen (MPa)
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