| CFRP has the advantages of light weight、better corrosion resistance、better fatigue resistance and the same elastic modulus as the steel tube.The special glue is used on the outer side of the steel tube to make sure a good combined effect between the steel tube and CFRP.Based on the advantages of CFST,CFRP concrete filled steel tube(CFST)possesses the better bearing capacity,corrosion resistance and fatigue resistance due to the effect of outer carbon fiber.Therefore,CFRP-encased CFST has a broad application prospect.In this paper,the static and hysteretic properties of circular CFRP concrete-filled steel tubes under compression-bending-shearing were studied through experimental research.18 round CFRP-concrete-filled steel tube specimens were taken to investigate.The test results show that the transverse carbon fiber can increase the bearing capacity of the component,and the growth rate of the bearing capacity will not exceed 10%.With the increase of axial compression ratio,the maximum bearing capacity of the specimens decreases gradually.Compared with the minimum shear-span ratio,the bearing capacity of maximum shear-span ratio specimens is about 1/2 of the minimum shear-span ratio specimens.Before the carbon fiber is completely broken,the carbon fiber strain curve and the steel pipe strain curve almost overlap,and the steel tube and the carbon fiber exhibit a good combined effect,which reflects the strong confined effect.The strength degradation of the circular CFRP-encased CFST is obvious under the action of bending-shear hysteresis;the increase in the number of transverse CFRP layers can slightly delay the stiffness degradation of the specimen,and the axial compression ratio has a great influence on the stiffness degradation of the specimen;The effect of CFRP layer number and shear span ratio on the energy dissipation of circular CFRP-encased CFST specimens under compression-bending-shear hysteresis is not obvious. |
PDF Full Text Request