Experimental Study On The Overall Stability Bearing Capacity Of Q460 High Strength Steel Welded T-Section Columns Under Axial Compression

In recent years,with the improvement of my country’s economy and the technical level of production and processing of steel,the application of high-strength steel in practical engineering has become more and more extensive.However,the mechanical properties of high-strength steel are quite different from ordinary steel.Compared with ordinary steel members,the stability performance is quite different,and it needs to be continuously researched and improved.In the research on the stability performance of high-strength steel members,there are many studies on the stability performance of welded H-shaped,welded box-shaped and other biaxially symmetrical steel compression rods at home and abroad.There are few studies on the stability of rods.Therefore,in this paper,the combination of experimental research and finite element numerical simulation method is used to conduct in-depth research on the overall stable ultimate bearing capacity of domestic Q460 high-strength steel welded T-section steel compression rods,and to discuss the influence of high-strength steel welded T-section steel compression rods.Considering the factor of the ultimate bearing capacity of the overall stability,a suggestion for the overall stability design of the welded T-section axial compression rod of domestic Q460 high-strength steel is given.The specific research contents and results are as follows:(1)Based on the previous material property test and residual stress measurement results of the research group,the overall stable bearing capacity test of three domestic Q460high-strength steel welded T-section axial compression rods was completed.The overall instability of the cross-section axial compression rod is the bending-torsional instability around the symmetry axis,and the member enters the elastic-plastic deformation stage when it is unstable;(2)Using the finite element ANSYS to establish the finite element model of the domestic Q460 high-strength steel welded T-section axial compression rod considering the initial geometric defects and residual stress,after comparing with the test results,it shows that the finite element simulation method in this paper can be more accurate The predicted overall stable ultimate bearing capacity of the domestic Q460 high-strength steel welded T-section axial compression rod can be used for the subsequent finite element parameter analysis and stability analysis of the Q460 high-strength steel welded T-section steel compression rod;(3)Using the finite element simulation method that has been tested and verified,the finite element parameter analysis of the Q460 high-strength steel welded T-section axial compression rod is carried out,and the influence of the initial geometric defects and residual stress of the steel member on its overall stability coefficient is discussed.The initial bending,initial torsion and residual stress of the section have a great influence on the overall stability of the Q460 high-strength steel T-section axial compression rod with medium slenderness ratio,and have little influence on the components with large slenderness ratio;(4)Using the finite element simulation method that has been tested and verified,the stability of the Q460 high-strength steel welded T-section axial compression rod is analyzed.The results show that the domestic Q460 high-strength steel welded T-section axial compression rod is designed to select b Sectional column curves are safe and reasonable.The research conclusions of this paper can provide a theoretical basis for the design of domestic Q460 high-strength steel welded T-section axial compression rods,and can also provide a reference for the compilation of "High-strength Steel Structure Design Regulations",so as to promote high-strength steel to be more widely used in construction projects.development and application.