大开孔压力容器在开孔接管部位有很大的应力集中，必须进行补强。
There will be great stress concentration appearing nearby the junction of nozzle and shell of pressure vessels with big openings, so reinforcement is absolutely necessary.
在塑性极限分析的基础上，本文提出受内压球壳开孔接管的一种整体补强设计方法。
This paper describes a design procedure of spherical shells with nozzles subjected to internal pressure based onthe limit analysis.
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