The fully stressed design criterion is approximate and the stress ratio algorithm must be used repeatedly.
满应力设计准则是近似的，同时必须循环运用应力比算法。
Based on its stress characteristics, the author introduces points for attention in design such as control of axial compression ratio and structural measure.
根据异形柱的受力特点，论述了在设计时应注意轴压比控制和构造措施等方面的要求。
The design philosophy and method for equal stress ratio of pumping rod are proposed and the corresponding software for optimization design of rod pumping parameters is compiled.
文中还提出了抽油杆等应力比的设计思路和方法，并编制了相应的机抽参数优化设计软件。
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