Research On The Stability Of Q420 High Strength Steel Equal Single Angle Members Under Axial Compression

An axial compression experiment about seven groups of Q420 high strength steel equal single angle columns with different width/thickness ratio and slenderness ratio was carried out in this paper,and the overall stability and ultimate bearing capacity of Q420 high strength steel column was researched as well. An finite element model(FEM)was also built by using ANSYS software. It turns out the results of the numerical model which considered residual stress and geometric imperfections. The stability capacity of high strength steel member was researched by changing the parameters, such as width/thickness ratio, residual stress and geometric imperfections.The overall stability load of Q420 high strength steel compression members was calculated with the relevant specifications and codes. Comparison with test results, there is a discrepancy between the stability capacity results of test and calculated by Chinese GB50017-2003, the computing formula in this code is very conservative. But the result of ASCE10-97 is relatively closer with test, which can be referred in the actual engineering computation.Based on the FEM, the calculated numerical results can be used in fitting the curve ofφ-λand formula, and it is hoped that the formula may provide some reference for practial engineering.