Calculation Method of Bolt Load of Flange Subjected to Bending Moment Load Considering the Influence of Joint Surface
The joint surface and bolt of flange structure bear the load of external bending moment.Based on the theory of pure bending of beam and the assumption of bending plane and unidirectional force of beam,a method of bolt load analysis based on the overall moment of inertia of flange is proposed in this paper.This method first calculates the overall moment of inertia of flange joint surface and bolt under bending moment load,and then calculates the maximum bolt load according to bending moment load.It calculates bolt load according to flange joint surface size and bolt distribution,which is not affected by flange structure form.The proposed method,finite element method,center rotation calculation method and eccentric rotation calculation method are used to analyze the bolt force of typical flange structure under bending moment load.The results of the proposed method are consistent with those of the finite element analysis method,and it has higher accuracy than other methods.When all the three methods,the proposed method,center rotation calculation method and eccentric rotation calculation method,are applied to flange structure with wing plate,the minimum bolt load is obtained by the proposed method.
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