也有一个对最大组合应力的限制，持续负载加上位移应力，以限制渐变。
The maximum operating stress is computed and limited to prevent conditions of ratchet(progressive plastic deformation with cycles), and not to fatigue.
然后，对管道设计规范和容器设计规范中针对位移应力和二次应力的强度条件进行了讨论。
Then, the intensity limitations for the displacement stress and secondary stress used in the piping design codes and the pressure vessel design codes were discussed.
建立桩身单元的位移应力方程时，采用压缩杆理论；建立土体界面单元方程时，采用层状材料基本解。
Because of using the fundamental solutions of layered elastic solids, the proposed method can be used for analysis of the pile-foundation interaction in non-homogeneous soil.
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