对于单一开孔板连接件或剪力钉连接件力学特性的研究，各国学者已进行了大量数值分析与试验的探索，得出了单一开孔板连接件或剪力钉连接件的力学行为。但实际混合桥塔的钢-混结合段内部是由大量开孔板连接件和剪力钉连接件形成的群钉组合连接件构成的。当前对于钢-混结构内组合连接件的研究比较匮乏，还没有明确的数值模型及理论推导用于组合连接件传力规律的研究。且组合连接件本身的设计参数对抗压性能的影响也还需要进一步的明确。因此，以顺德大桥的桥塔钢混结合段内的一种组合剪力连接件为实例，研究此抗剪连接件在弹性加载阶段，其内部的开孔板连接件和剪力钉连接件分别对该单层组合剪力连接件抗压刚度的贡献；建立弹簧模型，推出此单层组合剪力连接件弹性刚度的计算公式；利用ABAQUS有限元软件对单层组合剪力连接件进行加载仿真模拟分析，在弹性加载阶段其荷载-位移曲线呈极强的线性关系，拟合后与所推导公式的弹性刚度计算结果进行比对。结果表明：单孔开孔板连接件抗压刚度解析解与数值解的误差为4.87％，单根剪力钉连接件的抗压刚度解析解与数值解的误差为0.903％，单层组合剪力连接件的抗压刚度解析解与数值解的误差为11.54％，所推导弹性刚度公式的计算结果与有限元模拟分析结果吻合性较好。

For the research on the mechanical properties of single perforated plate connector or shear stud connector, international scholars have carried out a lot of numerical analysis and experimental exploration, and obtained the mechanical behavior of single perforated plate connector or shear stud connector. However, the interior of the steel-concrete composite section of the actual hybrid bridge tower is composed of a large number of perforated plate connectors and shear stud connectors. At present, the research on composite connectors in steel-concrete structures is relatively scarce, and there is no clear numerical model and theoretical derivation to study the force transfer law of composite connectors. And the influence of the design parameters of the composite connector itself on the compressive performance also needs to be further clarified. Therefore, taking a composite shear connector in the steel-concrete composite section of the bridge tower of Shunde bridge as an example, this paper studied the contributions of the perforated plate connector and the shear stud connector to the compressive stiffness of the single-layer composite shear connector during the elastic loading stage. Then it established the spring model and derived the formula for calculating the elastic stiffness of the single-layer composite shear connector. Using ABAQUS finite element software, the load simulation analysis of single-layer composite shear connectors was carried out. In the elastic loading stage, the load displacement curve shows a strong linear relationship. After fitting, the results are compared with the elastic stiffness calculation results of the derived formula. The results show that the error between the analytical solution and the numerical solution of the compressive stiffness of the single hole perforated plate connector is 4.87%, the error between the analytical solution and the numerical solution of the compressive stiffness of the single shear stud connector is 0.903%, and the error between the analytical solution and the numerical solution of the compressive stiffness of the single-layer composite shear connector is 11.54%. The calculated results of the derived elastic stiffness formula are in good agreement with the results of the finite element simulation analysis.