As the hinge to transfer the internal force of the building structure,the special-shaped joint is an important guarantee for the safety of the structure to meet the stress requirements.In order to accurately restore the mechanical characteristics of special-shaped joints,a multi-scale nonlinear numerical simulation method is proposed for the ultimate bearing characteristics of special-shaped joints in steel structures.Considering geometric structure,material properties and other factors,a nonlinear finite element model of special-shaped joints in steel structure buildings is built.The loading process of special-shaped joints is simulated,and the mechanical mechanism of joints is analyzed at multi-scale.The ultimate bearing capacity of special-shaped joints is calculated from the aspects of shear resistance and bending resistance,and the numerical simulation results of the ultimate bearing characteristics of special-shaped joints are output.The results show that compared with traditional numerical simulation methods,the simulation error of the ultimate bearing capacity of the optimized design method has been reduced by 1.88 N;The application of this method can effectively reduce the probability of instability of irregular nodes.
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