识别过程中采用两个杆单元模拟发生节点损伤的杆件，用抗弯刚度降低的端部短杆单元模拟节点损伤。
Two elements are adopted to represent a strut with joint damage, and the shorter element with lower moment-resisting stiffness is used to simulate the joint damage.
本文的计算方法可以很好的计算此类节点的初始转动刚度和塑性抗弯承载力； 本文的数学模型也可以很好的模拟此类节点的弯矩转角关系。
The mathematical model of the relations between bending moment and the angle of rotation were also provided and the calculated results were compared with the FEM analysis results.
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