Research On Seismic Behavior Of Circular Hybrid Steel-Concrete-CFRP-Concrete Columns

FRP composite material as the third structure applied materials after concrete andsteel, with its high tensile strength and corrosion resistance, and many other advantageswas widely used in aerospace engineering and other architectural engineering. At present,the use of FRP in engineering application was mainly in reinforcement of the structure, andin the structure, FRP are bare naked in the external. We know that FRP on the refractoryperformance is poorer, which make it difficult to play its superior performance in the caseof high temperature. Because of this defect, in very great degree has limited thedevelopment of FRP use in some structure.The new circular hybrid Steel-Concrete-CFRP-Concrete column (simply called SCCCcolumn) proposed in this paper which place the CFRP in the interior of concrete filled steeltube, because of concrete belong to hot laziness material, in the column use the annularconcrete protection can effectively slowing of the CFRP heating rate. But for thedevelopment of a component, just consider the performance on the one hand is not enough,we should from several aspects to further study to promote the column development betterin engineering.In this paper, we use the finite element analysis and test two methods to study theseismic behavior of the SCCC column. Detailed introduces the measurement and loadingmethod in the test, and finite element of the unit type and the boundary condition. The testresults show that SCCC columns under the low cycle reciprocating load have the plumphysteresis curve, without apparent knead shrink phenomenon. The rigidity degradation ofcolumns is slow; the specimens have good energy dissipation capacity. Ductilitycoefficient can meet the requirements of ductility specimens. The results indicate thatSCCC columns have excellent seismic performance. Through analysis of test data we knowthat the axial load level have a certain extent effect to seismic performance of SCCCcolumns; different CFRP tube diameters also influence SCCC column seismic performance.The finite element analysis results show that the results calculated by finite elementsoftware ABAQUS agree well with the test results. Explain to select the suitable unit types,failure criteria and boundary conditions, defined the correct material attribute, can throughthe finite element software for numerical simulation of SCCC columns. Use the finiteelement analysis software numerical calculation for some large or super large specimens,which can not use the test finished.According to the test and finite element simulation result can be informed, along withthe increase of CFRP tube diameter, the seismic performance of SCCC columns enhancement. The axial load level of SCCC columns has great influence to its seismicperformance. The result of this paper can applicant reference for SCCC columns developin engineering and the future study of the other aspects performance.