Issue 46

W. Hao et alii, Frattura ed Integrità Strutturale, 46 (2018) 391-399; DOI: 10.3221/IGF-ESIS.46.36 397 Considering the crack resistance of steel fiber in RPC, the tensile stress-strain relationship of RPC is shown in formula (2): 2 3 1.7 1.1 0.8 0.9 0 1 1 2( 1) i ctp ct x x x x y x x x x x y f                  (2) where: ε ctp is the compressive strain when RPC reaches the peak tensile strength, which is set to be 400×10 -6 ; f ct is the peak tensile strength of RPC, which is set to be 11.43N/mm 2 . The stress-strain curve of steel [14] is divided into five stages: elastic, elastic-plastic, plastic, hardening and one-time plastic flow. Figure 5: Comparison of the experiment results and analysis results. Comparison between the experiment results and the analysis results Through the finite element simulation analysis of the RPC filled square steel tubular columns, the analysis results of the load-span lateral displacements of some specimens are compared with the experiment results, as shown in Fig. 5. It can be seen that the experiment results are close to the simulation analysis results, indicating that the model is correct and reasonable and can provide theoretical reference for engineering practice.