Issue 39

J. Navrátil et alii, Frattura ed Integrità Strutturale, 39 (2017) 72-87; DOI: 10.3221/IGF-ESIS.39.09 80 For concrete, the compressive strength is specified as f c = 33.99 MPa. We assume the stress-strain relation for non-linear analysis given by EN 1992-1-1 [4], provision 3.1.5, with: f cm = 33.99 MPa, E cm = 31 GPa, ߝ c1 = 2.1 ‰, ߝ cu1 = 3.5 ‰. The resulting stress-strain diagram for concrete used for the analysis is illustrated in Fig. 13. In order to evaluate the results, we can compare the ultimate normal force determined by the IDEA StatiCa with the value stated in [7], see Tab. 3. It is obvious that the result obtained by the IDEA StatiCa solver and the value of the ultimate normal force stated in the reference are closely similar. Figure 13 : Stress-strain diagram of concrete. Ref. [7] IDEA Difference F max [kN] 208 196 δF max = – 5.77 % Table 3 : Comparison of results. Figure 14 : Cross-section and the load of concrete-encased composite column.