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.
首先利用变分原理确定板的负塑性铰线方程，继而推导出极限承载力的表达式。
The negative plastic hinge line in the plate was evaluated by using variational approach, then an equation for calculating the ultimate load carrying capacity was developed.
定义了概率极限间隙和概率极限过盈，并推导出了它们的计算方法。
Then deduce the way that to calculation the probability limit clearances and the probability limit interferences.
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