On the structural analysis, connection effects should be evaluated in terms of rotational stiffness and ultimate strength; this makes it possible to obtain realistic behavior of the structure. In this research, a simple analytical evaluation is carried out to predict the behaviors of the connections as a bi-linear curve. Mechanical properties of the initial and the second parts of this curve are obtained by component-based method and a suggested classification method, respectively. The component-based method represents a joint by using a combination of rigid and flexible components. Each of the components is modeled by means of specific stiffness and strength values and they are assembled together to obtain the initial mechanical properties of the joint. The suggested classification method classifies all the components in a connection into three groups based on comparing the ultimate and the design moment strength of each component with those of the connection. By considering this procedure, a new equation is proposed to determine joint post-limit rotational stiffness. This simple and fast method is applicable to any type of joints regardless of profile type and applied loading. The proposed method is applied to a bolted angle, an end-plate to rectangular hollow section column and two bolted end-plate beam-to-column connections. The results are compared with those obtained from some other analytical, numerical and experimental methods. The outputs confirm that the proposed method is simpler, more accurate and less time consume than the other methods.

在结构分析中，应根据旋转刚度和极限强度评估连接效果；这使得获得结构的真实行为成为可能。在这项研究中，进行了简单的分析评估以将连接的行为预测为双线性曲线。分别通过基于组件的方法和建议的分类方法获得此曲线的初始和第二部分的机械性能。基于组件的方法通过结合使用刚性和柔性组件来表示关节。每个组件都通过特定的刚度和强度值进行建模，然后将它们组装在一起以获得接头的初始机械性能。所建议的分类方法是根据每个构件的极限强度和设计弯矩强度与连接构件的极限强度和设计矩强度进行比较，将连接中的所有构件分为三类。通过考虑此过程，提出了一个新的方程式来确定关节后极限旋转刚度。这种简单，快速的方法适用于任何类型的接头，而不管轮廓类型和所施加的载荷如何。所提出的方法应用于螺栓角，端板至矩形空心截面柱以及两个螺栓端板的梁柱连接。将结果与从其他一些分析，数值和实验方法获得的结果进行比较。输出结果表明，与其他方法相比，该方法更简单，更准确且耗时更少。