The shoulderbeam is a joint point between the upper and lower part of polystyle columns.Based on its mechanical analysis,the shoulderbeam is simplified to an elastic hinge with angle stiffness.

肩梁是多肢柱中上下柱的连接节点，根据其受力特点，在建立力学模型时，将它简化为具有角刚度的弹性铰。