为获得大直径螺栓典型连接结构的承载特性,在有限元分析的基础上开展地面试验研究,获得大直径螺栓的轴力与附加弯矩,揭示其破坏机理.分析及试验结果表明,附加弯矩是影响大直径螺栓承载能力的重要因素,考虑附加弯矩后,等效轴力是原始轴力的数倍.提出了考虑附加弯矩影响后的大直径螺栓强度计算公式,提高了预示精度.此外,开展了降低大直径螺栓附加弯矩的方法研究,指出了结构优化方向.
In order to obtain the load-bearing characteristics of large diameter bolt under typical connection structure,ground test research on the basis of finite element analysis is carried out,which obtains the axial force and additional bending moment of large diameter bolt and revealsits failure mechanism.Analysis and test show that the additional bending moment is an important factor affecting the load-bearing capacity of large diameter bolts.After considering the additional bending moment,the equivalent axial force is several times of the initial axial force,which must be paid attention to in the design work.The formula for calculating the strength of large diameter bolt considering the influence of additional bending moment is proposed,which improves the accuracy.In addition,the method of reducing the additional bending moment of large diameter bolt is studied,and the direction of structural optimization is pointed out.