多向受力状态焊钉连接件受力特性分析

 鉴于索塔锚固结构中焊钉受力状态的特殊性，对混凝土竖向承压、水平力及两者共同作用下焊钉连接件的受力特性进行研究。通过对单钉推出试验进行有限元分析，验证了有限元模拟方法的正确性。采用有限元方法，研究了在混凝土竖向承压、水平力及两者共同作用下，焊钉连接件抗剪承载力、剪切刚度以及焊钉变形、应力的变化规律。研究表明，混凝土竖向承压对焊钉连接件抗剪承载力和剪切刚度均产生影响；在幅值变化相同的情况下，水平拉力的变化对焊钉极限承载力的影响显著，而水平压力的变化则对焊钉剪切刚度的作用明显；两种受力状态下焊钉变形和应力分布规律相近；混凝土竖向承压和水平力共同作用下，钢板与混凝土接触状态不同，焊钉连接件抗剪承载力和剪切刚度的变化规律则不同。

Mechanical Features of Stud Connector under Loading Conditions

Because of the special stress conditions of studs in cable-pylon composite anchor structure, it is necessary to study the mechanical features of studs under the vertical pressure of concrete pylon and the horizontal force and their interactions. The stud push-out test is analyzed by finite element method (FEM) and the simulation is validated by the experimental results. Based on FEM, this paper studies the shear capacity, shear stiffness, deformation and stress distribution of studs under loading conditions which are the vertical pressure of concrete pylon and horizontal force and their interactions. The results show that the vertical pressure affects the shear capacity and shear stiffness of studs. In the case with the same amplitude variation, changes of the horizontal tension affects the shear capacity of stud significantly, while changes of horizontal pressure affects the shear stiffness of studs significantly. Under the two loading conditions, the deformation and stress distribution of studs performs in the similar way. Under the interaction of the vertical pressure and horizontal force, the variation patterns of shear capacity and shear stiffness of studs are different, while the contact conditions of steel and concrete are different.