Research On The Compression And Torsion Properties Of Square Concrete Filled CFRP-Steel Tube

When the building under the action of earthquake,earthquake is the destruction of buildings by pressure,bending and torsion loads of composite columns,of course,in the static state,the column will also receive pressure,bending and torsional composite load,the performance function of structure in compression and torsion under the condition of research is very important.Due to previous studies on the mechanical properties of CFRP concrete filled steel tubes such as compression,shear and bending,the research on the mechanical properties of square CFRP CFRP concrete is not perfect.Therefore,it is necessary to study the mechanical properties of square steel tube concrete under compression and torsion.At present,the research on CFRP-concrete-filled steel tubes is mainly concentrated on the experimental and theoretical analysis of loading forms.In order to improve the related theory,based on the test and the finite element simulation software ABAQUS,the compressive and torsional properties of the CFRP-CFST members were further studied and analyzed in this paper.The design parameters of the specimen were introduced.The material characteristics of concrete,steel pipe and CFRP were enumerated,and the process of specimen fabrication was elaborated.The process of sticking CFRP was emphasized.The test loading scheme,such as loading device,loading system,measurement content and so on,is introduced in detail,especially on the test loading device.The results show that with the increase of the longitudinal CFRP,the number of transverse CFRP layers and the increase of concrete strength,the torsion resistance of concrete filled steel tube specimens of square CFRP-is gradually increased.The finite element software ABAQUS is used to establish the model of square CFRP-CFST under torsion.The correctness of the model is proved by macroscopic curve,microcosmic curve and failure form.Followed by a typical example of the stress analysis of the whole process,parameter analysis to draw the conclusion as the research object:CFRP concrete and steel pipe,corresponding to the feature points of the stress state can well explain the phenomenon of the specimen during the test;influence of material strength and steel ratio change of component torsional ability is most obvious,the increase of them can significantly improve the component torsional ability;finally draws the related equations,calculation results and experimental results agree well with.