Table 2: Comparison between the results obtained by the methods in the codes and the experimental results (Nuc/Nu).

No. ACI[19] EC4[20] GJB[21] DBJ[22]
C1 1.088 1.178 1.306 1.313
C2 1.016 1.079 1.132 1.241
C3 0.838 0.887 0.925 1.091
C4 0.876 0.961 1.095 1.101
C5 1.309 1.395 1.484 1.590
Mean value 1.025 1.100 1.188 1.267
Standard deviation 0.188 0.199 0.213 0.204

Notes: The strength of concrete adopted in the codes GJB and DBJ is fck =0.76fcu,k, while that adopted in the codes ACI and EC4 is fc'=0.79fcu,k.