在规则边界的薄板的塑性极限分析过程中，通常会有产生塑性铰线这一现象。
Some can get holomorphy solutions. In the course of plastic limit analysis, maybe there are the phenomena of producing yield-line.
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.
采用塑性铰线理论，对三种可能的塑性铰线形式分别进行分析，得到极限承载力的解析式。
Using plastic yield line theory, three yield line patterns are analysed and the formulas of the ultimate bearing capacity are obtained.
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