Research On Axial Compression Performance Of Cold-Formed Thin-Walled Steel Members With Triangular Split Section

Cold-formed thin-walled steel components have been widely used in light steel structure building systems at home and abroad in recent years.From a large amount of data,it can be found that my country will become the largest country in steel consumption in the future.In order to strengthen the relevant mechanical properties of cold-formed thin-walled steel components and make suggestions,this paper studies a new type of cold-formed thin-walled steel components—triangular split-section components.Traditional cold-formed thin-walled steel members with cross-sections such as [shaped,Z-shaped,U-shaped,etc.,have weak shafts,which are likely to cause obvious overall buckling first and then fail.It is envisaged that in steel structure buildings,the use of cold-formed thin-walled steel members with similar special-shaped cross-sections can solve the above problems well.The triangle itself has extremely high stability,and there is no weak axis in the split section,so the research on the buckling performance of the triangle split section has very high theoretical significance and engineering practical value.First of all,this paper conducts experimental research on three groups of different material properties [shaped,Z-shaped,U-shaped,triangular and triangular composite cross-section members under the same steel consumption,and describes the test phenomena of the specimens and analyzes the test phenomena.The ABAQUS finite element analysis is performed on the components,and the simulation results are consistent with the test results,which confirms the accuracy of the analyzed model in this paper.The research shows that the triangular split section members proposed in this paper have excellent mechanical properties.Secondly,the variable parameter linear elastic buckling analysis is carried out on the triangular split section members,the buckling mechanism and buckling modes of the members are studied,and the buckling bearing capacity of the members under different parameters is obtained.The results show that the parameter that has the greatest influence on the buckling load of the member is the thickness of the plate;the change of the member hemming parameter has the greatest influence on the buckling mode of the member;the study on the parameter of the slenderness ratio of the member shows that the member The buckling load decreases as the length of the member increases.With the increase of the vertical spacing of the bolts,the critical load of the component gradually decreases,indicating that the pre-tightening force of the bolt has a certain fastening effect on the component,and the bolt also bears part of the component’s force.Finally,suggestions for the parameter value range of component dimensions are given for this part,which can be used as a reference for design.Finally,the economic benefits of different components under the same side length are compared.The cold-formed thin-walled steel components with triangular split cross-sections are modeled and calculated using finite element software,and they are compared with the traditional [shape,Z-shape,U-shape And the comparative analysis of load-bearing capacity and steel consumption of triangular section members(including linear elastic comparative analysis and nonlinear comparative analysis).The finite element analysis results show that the triangular composite section members are either in terms of buckling bearing capacity or ultimate bearing capacity,or The deformability at failure is much better than that of cold-formed thin-walled steel members with traditional cross-sections.