| In this thesis,the overall stability of Q460,Q550,Q690 high-strength steel pipes after pasting GFRP fiber cloth has been compared systematically.Use the finite element simulation software ABAQUS 6.14-4 to establish a refined finite element model,which considers the influence of initial geometric defects,geometric nonlinearity and material nonlinearity on the model;and verify the finite element model based on the existing test data Validity and accuracy.Based on this,216 finite element models are established.Through parameter analysis,the focus is on the yield strength of the steel,the slenderness ratio of the component,the diameter-thickness ratio of the component,and the change in the number of GFRP fiber cloth layers on the component.The influence of ultimate bearing capacity;compare the calculation results of the finite element simulation and the formula calculation results in the British FRP-steel structure reinforcement code;according to the analysis results,based on the reference to the Chinese steel structure design standard formula form,the use of components is proposed the idea of converted section method are used to calculate the stable bearing capacity of the GFRP-highstrength steel tube section axially compressed member,and to estimate the correction coefficient of the stable bearing capacity formula.Studies have shown that the finite element model comprehensively considering the influence of various factors can better simulate the overall buckling performance of the GFRP-high-strength steel circular tube section axial compression member;its ultimate bearing capacity increases with the increase in the yield strength of the selected steel and the member diameter The thickness ratio increases and the number of GFRP fiber cloth layers increases,and its ultimate bearing capacity decreases with the increase in the slenderness ratio of the component.The proposed formula can predict the overall buckling ultimate bearing capacity of GFRP-high-strength steel tube section axial compression members. |
