AP1000核电厂支撑钢结构稳定性分析方法研究

Study on Stability Analysis Method of Support Steel Structure in AP1000 Plant

AP1000核电厂支撑钢结构的力学设计主要遵循美国建筑钢结构设计规范(AISC 335-1989和AISC N690),其稳定性分析主要采用有效长度法。而最新版的建筑钢结构设计规范(ASIC 360-2010)中首选直接分析法,有效长度法作为其替代方法。此外,相比于AISC 335-1989,AISC 360-2010中明确要求考虑钢结构的非线性二阶效应以及初始缺陷等对稳定性分析的影响。本文详细阐述了AISC 360-2010中稳定性分析的要求,以及直接分析法与有效长度法的特点,并以1个支撑钢结构框架为例,采用力学分析软件GTStrudl进行了2种方法的研究与比较。结果证明,对于简单结构,2种方法都适用;对于复杂结构,直接分析法较为简便高效。

At present, the mechanical design of non-nuclear steel support in AP1000 plant follows the Specification for Structural Steel Buildings（AISC 335 and AISC N690）, in which the stability analysis adopts the Effective Length Method（ELM）. While the latest version of Specification for Structural Steel Buildings（ASIC 360-2010） prefers the Direct Method（DM）, and ELM as its alternative. In addition, compared to AISC 335-1989, AISC 360-2010 explicitly requires the consideration of the nonlinear second order effects and initial defects in the stability analysis of the structure support. This paper described the requirements of stability analysis in AISC 360-2010, and the characteristics of DM and ELM. Then using a steel support frame as an example in GTStrudl, the research and comparison of the two methods is conducted. For simple structures, the two methods are applicable; for complex structures, Direct Method is simpler and more efficient.