Because of the excellent static and fatigue performance, the interference-fit bolted structure has a wide application prospect in the joint field. In this paper, an improved spring-mass stiffness analytical prediction model is established for the interference-fit bolted single-lap laminated composite structure. The influences of interference-fit percentage, bolt preload, secondary bending and interface frictions are considered in the model. Combined with experimental research, the value of secondary bending moment coefficient ε is studied, and the correctness of the analytical model is verified. Based on the improved stiffness model, parametric research and regression analysis on the interference-fit percentage, preload, friction, laminate width and material properties are carried out and show that the overall structure stiffness is obviously affected by ε value, laminate width and laminates properties. The stiffness decreases with the increase of ε and increases with the increase of laminate width. And as the key factors, the interference-fit percentage mainly affects the joint local friction and bolt shear stiffness, the preload and friction coefficient mainly affect the local friction, and the laminates sizes and properties directly affect the overall structural stiffness.

由于过盈配合螺栓结构具有优异的静力和疲劳性能，因此在接头领域具有广泛的应用前景。本文建立了一种改进的弹簧质量刚度分析预测模型，用于过盈配合螺栓连接的单叠层复合结构。模型中考虑了过盈配合百分比、螺栓预紧力、二次弯曲和界面摩擦的影响。结合实验研究，二次弯矩系数ε取值进行了研究，验证了解析模型的正确性。基于改进的刚度模型，对过盈配合百分比、预紧力、摩擦力、层板宽度和材料特性进行参数研究和回归分析，结果表明整体结构刚度受ε值、层板宽度和层板性能的影响明显. 刚度随着ε的增加而降低，随着层压板宽度的增加而增加。作为关键因素，过盈配合百分比主要影响接头局部摩擦和螺栓剪切刚度，预紧力和摩擦系数主要影响局部摩擦，层合板尺寸和性能直接影响整体结构刚度。