本文通过对塑性分析方法比较，采用了塑性弯矩系数和荷载系数来表达机构破坏荷载公式。
By comparing the ways of plastic analysis, the plastic moment coefficient and load coefficient are used to illustrate the collapsing load formula of mobile-structure.
当目标函数是塑性极限弯矩凸函数时，证明了这一最优性条件也是最优解的充分条件。
It is proved that the optimality conditions are also sufficient if the objective function is a convex function of the plastic limit bending moment.
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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