弯曲载荷作用下舱段连接螺栓组载荷数值研究

Numerical investigation on connecting bolt-set loads between cabins under bending moment

鉴于工程计算方法对舱段间连接螺栓组在弯曲载荷作用下的受力问题较低的计算精度,采用有限元仿真方法研究了连接螺栓组的弯矩载荷和轴拉载荷的大小和分布规律,并进一步分析了舱段连接螺栓预紧力、螺栓数量、螺栓直径、螺栓分布圆直径及舱段法兰厚度对舱段连接螺栓组载荷的影响。结果表明,在舱段弯曲载荷作用下,螺栓的最大轴拉载荷是工程理论计算结果的1.45~2.53倍;在线弹性范围内,同时考虑螺栓轴拉载荷和弯矩载荷的最大等效轴拉载荷是工程理论计算结果的2.43~7.06倍;螺栓的弯矩载荷,显著增大了螺栓的最大应力;螺栓的最大轴拉载荷随着螺栓数量的减少、螺栓分布圆直径的减小而显著增大,其中螺栓直径大小、法兰厚度的影响较小;螺栓的最大弯矩载荷随着螺栓数量的减少、螺栓直径的增大、螺栓分布圆直径的减小、法兰厚度的减小而显著增大。

In view of the low computational accuracy of the engineering calculation method on the bolt-set load between the ad-jacent cabins under the bending load,the moment and axial tension of the bolt-set were analyzed by the finite element simulation methods of the cabin connecting structure.Then the influence of the pretension force,the bolt number,the bolt diameter,the distri-bution diameter of bolts and the flange thickness were further researched.The results indicate that under the cabin bending moment,the maximum axial force of bolts is 1.45~2.53 times than the calculated results;the equivalent axial force considering the axial force and the moment of bolts is 2.43~7.06 times than the calculated results in the elastic range;the moment of bolts leads to the remark-able increase of the bolt maximum stress;the maximum axial load of bolts increases significantly with the decrease of the number of bolts and the distribution diameter of bolts,whereas the influence of the diameter of the bolts and the thickness of the flange is little;the maximum bending moment of bolts increases significantly with the decrease of the flange thickness,the number and the distribu-tion diameter of bolts,as well as the increase of the bolt diameter.