Research on axial compression behavior of a new type cold-formed walls
To investigate the axial compressive performance of sprayed lightweight mortar-cold-formed thin-walled steel wall columns,this paper employs finite element analysis and experimental testing to examine the effects of parameters such as column spacing,column wall thickness,cross-section dimensions,steel strength grade,thickness of mortar on both sides,number of transverse braces,and length of column on the axial compressive bearing capacity of the columns,respectively.Based on the experimental characteristics of the new wall column,the mechanical model grounded in elastic stability theory is constructed.Using the energy method and variational principle,the elastic buckling load of the new wall column,and the ultimate buckling stress correction parameters are further solved,so as to establish the design and calculation method of the type wall column.The results indicate that the ultimate load,damage mode,load displacement curve of finite element analysis closely align with the experimental findings.The axial compressive load capacity of the new wall column remains largely unaffected by the mortar thickness on both sides and the spacing between columns.In structural design,enhancing the wall thickness of the steel columns,increasing the section size,and improving the steel section's strength can significantly boost the column's axial compressive load capacity.Conversely,as the height of the columns increases,their axial compressive load capacity decreases.While the number of cross braces greatly influences the axial compressive load capacity of pure keel columns,it has a less impact on the new wall columns.When calculating the axial compressive load capacity calculations of new wall columns,using the Chinese norms to correct the elastic buckling stress and compute the effective area yields ultimate load values that are more conservative than the experimental results.It is recommended to multiply the axial compressive capacity by a correction factor of 1.25,which is calculated according to Chinese norms.
万方数据
维普
