对屈服条件与屈服函数的极值条件进行了讨论，在不需要流动法则的情况下建立了速度方程。
The extreme conditions of yield condition and yield function are discussed; and a velocity equation is established under the condition that no flow rule has been required.
导出了基于双剪屈服准则的钢筋混凝土球扁壳的屈服条件，并利用此屈服条件求解出其极限荷载。
The yield conditions of axisymmetric circular plate and shallow spherical shell of reinforced concrete based on Twin shear stress yield criterion are presented in the paper.
文中证明，特征线法的应力关系式与本文的屈服条件、屈服函数的极值条件是相同的。
When the material does not display a yield point, a quantity known as the proof stress is used when making design calculations.
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