Theoretical Analyses On Static Compressive-shearing Performances Of Concrete Filled CFRP-steel Tubes

Because CFRP has the advantages of light weight,high strength,eorrosion resistance and low price,it has been widely used in engineering.CFRP-concrete filled steel tubular(CFRP-CFST),which combines CFRP with concrete filled steel tubular(CFST),has higher bearing capacity and corrosion resistance than concrete filled steel tubular(CFST).At present,the research on CFRP-concrete filled steel tubular is mainly focused on the axial compression performance,flexural performance and stability performance,while the research on the compression-shear performance,which is also common in engineering,has not been reported yet,so it is necessary to study CFRP-concrete filled steel tubular.On the basis of the static performance tests of 12 CFRP-concrete filled steel tubular compression-shear specimens with circular and square cross-sections,the finite element software ABAQUS was used to simulate the CFRP-concrete filled steel tubular compression-shear static test,and the simulation results were compared with the test results;the whole process of force analysis and parameter analysis were carried out by using the model,and on this basis,the compression performance of CFRP-concrete filled steel tubular was fitted.-Formulas for calculating shear capacity related equations.The results show that the bearing capacity of circular and square specimens increases slightly with increasing the number of layers of transverse CFRP,but the overall shape and stiffness of the V The number of stories,yield strength of steel,compressive strength of concrete and steel content are the main factors affecting the shear-shear displacement curve.According to the relevant equations,the shear capacity of CFRP-concrete filled steel tubular compression-shear members increases with the increase of the axial compression ratio within a certain range,and the two are basically linear correlation.