Experimental study on local buckling of high strength steel I-section stub columns under axial compression

Aiming at the local buckling behavior of high strength steel welded I-section columns,9 axial compression tests of Q460C I-section stub columns were conducted.Based on the test results,the relation of buckling stress and ultimate stress of specimens with different width-to-thickness ratios were studied,and the clamping coefficients of flange and web were proposed.Besides,test results were compared with the corresponding design methods in Chinese,American and European steel structures design codes,to confirm whether the design methods can be used to calculate buckling stress and ultimate stress of Q460C I-section stub columns.The research work shows that the clamping coefficient of the flange is a fixed value 1.0,but web isn't a fixed value.The buckling stress of I-section stub columns achieved by the design method in the Chinese code is unreasonable.The ultimate stress achieved by the design method in the American code doesn't agree well with the test results,but it's conservative.The ultimate stress achieved by the design method in the European code agrees well with the test results,but it's probably unsafe.In addition,a new design method,which is in need of revision,is proposed to predict the buckling stress of Q460C I-section stub columns.The design method in the European code,which is in need of revision,is recommended to predict the ultimate stress of Q460 I-section stub columns.