A New Design Methodology for Carrying Capacity of Hot Rolled I Section Steel of Local Buckling: The Overall Interaction Concept

Through the finite element software ABAQUS, the finite element model considering the initial imperfection and residual stress is established, and the finite element results are compared with the collected test results to verify the reliability of the numerical model. By analyzing the ultimate carrying capacity of I section of axial compression with different aspect ratios, the design method of ultimate carrying capacity of axial compression members of hot rolled I section from thick to thin is studied. The result of Overall Interaction Concept (OIC) for hot rolled I section steel under axial compression is obtained by using the finite element calculation results, and the results are compared with the Eurocode (EN1993-1-1) and the Chinese steel structure design standard (GB50017-2017), so as to study the accuracy of the recommend design method. Results found that: i) the calculation result from EC3 of the cross section classification concept most conservative or unsafe, ii) the results from GB almost all conservative, iii) comparing with the existed design methods the OIC design method reflect the relationship between carrying capacity and the the generalized relative slenderness, that can accurately predict ultimate carrying capacity. Research shows that OIC is a more effective and accurate method.