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.
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