Issue 39

P. Král et alii, Frattura ed Integrità Strutturale, 39 (2017) 38-46; DOI: 10.3221/IGF-ESIS.39.05 43   , , 0, 2, 2 , 1, 2, 3, 1 T PR SIGF A A A F B P P BU  red X (5) The design vector reduction was then utilized during the optimization process as it shortens the computational time and saves the hard disk space without significantly affecting the achievement of the desired results. The reduced design vector X red already included only the 9 parameters having a marked impact on the numerical simulation results. The values of the pre-optimized material parameters and objective function ( LSM ) obtained from the best random realization generated within the sensitivity analysis are presented in Tab. 2. No. Parameter Unit Sensitivity analysis Evolutionary Algorithm 1 RO [Mg/mm 3 ] 2.468  10 -9 2.400  10 -9 2 PR [-] 0.1632 0.1677 3 SIGF [MPa] 3.4787 3.2092 4 A 0 [MPa] 13.2501 13.9527 5 A 2 [MPa -1 ] 1.755  10 -3 1.846  10 -3 6 A 0 Y [MPa] 10.613 10.130 7 A 2 Y [MPa -1 ] 5.568  10 -3 5.670  10 -3 8 A 2 F [MPa -1 ] 2.715  10 -3 2.820  10 -3 9 B 1 [-] 1.5425 1.4752 10 P 2 [MPa] 23.1475 22.7979 11 P 3 [MPa] 49.659 49.170 12 P 4 [MPa] 80.662 93.030 13 P 5 [MPa] 170.923 176.750 14 P 6 [MPa] 232.417 266.590 15 P 7 [MPa] 372.124 378.220 16 P 8 [MPa] 527.117 578.620 17 P 9 [MPa] 3362.560 3378.180 18 P 10 [MPa] 4812.750 5166.940 19 BU 1 [MPa] 16147.867 18220.000 20 BU 2 [MPa] 15205.699 17719.000 21 BU 3 [MPa] 16277.413 17967.000 22 BU 4 [MPa] 19149.825 18871.000 23 BU 5 [MPa] 20935.411 22450.000 24 BU 6 [MPa] 24486.102 26047.000 25 BU 7 [MPa] 28990.083 29627.000 26 BU 8 [MPa] 32188.319 32338.000 27 BU 9 [MPa] 65782.085 72755.000 28 BU 10 [MPa] 81950.750 88596.000 - LSM [kN 2 ] 10312.759 6601.210 Table 2 : The resulting identified material parameter values of the K & C Concrete model, obtained from the inverse analysis.