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.
在梁的极限分析中采用新的刚塑性模型，推导出极限弯矩公式。
Using the improved model, an ultimate bending moment formula is presented.
在梁的极限分析中采用新的刚塑性模型，推导出极限弯矩公式。
Using the improved model, an ultimate bending moment formula is presented.
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