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International Journal of Concrete Structures and Materials

Table 5 Feature values of each cluster (beam data set).

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

Beam

Cluster

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

c (mm)

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

(mm)

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

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

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

1

79

17

16

1.0

0.1

13

2

31

40

18

2.3

0.9

7

3

58

45

22

2.0

1.6

23

  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 \(\tau_{{b, {\text{max}}}}\)
  3. \(A_{{{\text{st1}}}}\): cross-sectional area of one leg of transverse reinforcement (mm2), \(S_{{{\text{st}}}}\): spacing of transverse reinforcement (mm), \(f^{\prime}_{{\text{c}}}\): compressive strength of concrete (MPa), \(d_{{\text{b}}}\): diameter of rebar (mm), \(f^{\prime}_{{\text{c}}}\): compressive strength of concrete (MPa), \(\tau_{{b, {\text{max}}}}\) maximum bond stress of a pullout specimen (MPa)
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