Load bearing structure is one of the key components of snubbing unit,and it's required for snubbing unit's normal operations. For these reasons,a mechanical model of bearing structure was established at the base of its structure and load characteristics,and a stress analysis was carried out and strength assessment of load bearing structure as well. The methods and processes of stress classification of the JB4732-95 criteria were introduced. The results provided technical reference for the strength assessment of complex construction.%承载结构是不压井装置的关键部件之一,也是保证不压井装置能够正常工作的必要条件.根据承载结构的结构形式和承载特点建立了力学模型,对承载结构进行应力分析,并引入JB4732-1995标准中的应力分类方法,对承载结构进行强度评价,为复杂结构的强度评定提供参考.
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