Issue 46

W. Hao et alii, Frattura ed Integrità Strutturale, 46 (2018) 391-399; DOI: 10.3221/IGF-ESIS.46.36 395 464kN and 510kN, respectively. In the descending stage of load-displacement curve, for a specimen with a large confinement coefficient, the rate of load drop was small. For example, the descending speed of the curve of a specimen with a confinement coefficient of ξ=1.13 was smaller than that with a confinement coefficient of ξ=0.65. In summary, the RPC square steel tubular specimens exhibited good ductility, and had greater bearing capacities than ordinary concrete-filled ones. Figure 4: Load-span lateral displacement curves of the specimens. Comparison of bearing capacity Comparison with experimental results in [4] refs that were ordinary concrete-filled square steel tubular column were shown in Tab. 5, their steel ratio is relatively close. When the eccentricity is 20 and 40, the bearing capacity of the specimen is increased by 172kN and 142kN respectively, increasing by 43% and 53% respectively. This shows that RPC filled square steel tubular column has obvious advantages. Specimen No. Steel tube wall thickness t/mm Eccentricity e/mm Length of specimen L/mm Slenderness ratio λ Steel ratio α Bearing capacity Nu/kN 3 2.63 20 800 27.71 0.11 573.0 [4] refs 2.72 20 800 27.70 0.12 401.0 9 2.63 40 800 27.71 0.11 410.0 [4] refs 2.72 40 800 27.71 0.12 268.0 Table 5: Comparison with experimental results in [4] refs.