Experimental study on ultimate bearing capacity of axially compressed high strength steel columns

An experimental and theoretical study was presented on ultimate bearing capacity of axially compressed high strength steel columns.The experimental program included 7 welded box columns of 3 different cross sections which were welded with 11 mm-thick Q460 high strength steel plates made in China.The FEA models were built up according to measured sizes of members and tension coupon test results.And initial geometric imperfections and residual stress were taken into account in the FEA models.The experimental result shows that the stability coefficients of welded box columns of high strength steel are higher than the values of type c column curve in GB 50017—2003,and even higher than the values of type b curve for most of the specimens.However,due to the limited test result,the adoption of type b curve needs further verification.The FEA result agrees well with experimental result and could be a valid supplement of test data.