考虑结合面影响的弯矩载荷下法兰螺栓载荷计算方法

Calculation Method of Bolt Load of Flange Subjected to Bending Moment Load Considering the Influence of Joint Surface

针对法兰结构的结合面和螺栓共同承受外部弯矩载荷,基于梁的纯弯理论,依据梁的弯曲平面假设及单向受力假设,提出一种基于法兰整体惯性矩的螺栓载荷分析方法。该方法通过计算法兰结构在弯矩载荷下法兰结合面、螺栓的整体惯性矩,再根据弯矩载荷计算最大螺栓载荷。该方法根据法兰结合面尺寸、螺栓分布计算螺栓载荷,不受法兰结构形式的影响。采用该方法、有限元法、中心回转计算法、偏心回转计算法对典型法兰结构在弯矩载荷下的螺栓受力进行分析,该方法与有限元分析方法计算结果一致,相对于其他方法具有更高的精度。将该方法、中心回转计算法、偏心回转计算法应用于带有翼板的法兰结构,该方法得到的螺栓载荷相对较小。

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.