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核电结构土-结相互作用分析分区混合计算方法

陈少林 郭琪超 周国良

陈少林, 郭琪超, 周国良. 核电结构土-结相互作用分析分区混合计算方法[J]. 力学学报, 2020, 52(1): 258-282. doi: 10.6052/0459-1879-19-271
引用本文: 陈少林, 郭琪超, 周国良. 核电结构土-结相互作用分析分区混合计算方法[J]. 力学学报, 2020, 52(1): 258-282. doi: 10.6052/0459-1879-19-271
Chen Shaolin, Guo Qichao, Zhou Guoliang. PARTITIONED HYBRID METHOD FOR SOIL-STRUCTURE INTERACTION ANALYSIS OF NUCLEAR POWER STRUCTURE[J]. Chinese Journal of Theoretical and Applied Mechanics, 2020, 52(1): 258-282. doi: 10.6052/0459-1879-19-271
Citation: Chen Shaolin, Guo Qichao, Zhou Guoliang. PARTITIONED HYBRID METHOD FOR SOIL-STRUCTURE INTERACTION ANALYSIS OF NUCLEAR POWER STRUCTURE[J]. Chinese Journal of Theoretical and Applied Mechanics, 2020, 52(1): 258-282. doi: 10.6052/0459-1879-19-271

核电结构土-结相互作用分析分区混合计算方法

doi: 10.6052/0459-1879-19-271
基金项目: 1) 国家自然科学基金资助项目(51978337)
详细信息
    通讯作者:

    陈少林

  • 中图分类号: O342

PARTITIONED HYBRID METHOD FOR SOIL-STRUCTURE INTERACTION ANALYSIS OF NUCLEAR POWER STRUCTURE

  • 摘要: 土-结构相互作用分析是核电结构进行抗震设计和安全评估的重要环节.在核电结构的土-结相互作用分析中,阻尼和非线性是影响结构反应的重要因素. 若采用频域分析,可以方便考虑阻尼,但需通过等效线性化来考虑非线性,不适合于强震作用下的土体非线性.若采用时域分析的逐步积分方法,适合于考虑非线性,但材料阻尼一般采用瑞利阻尼模型,除了紧靠指定阻尼比的少数几个振型外,其他振型的反应将受到瑞利阻尼模型所确定的大阻尼所抑制,造成地震反应与真实情形有较大差异.若采用时域分析的模态叠加法,可合理计入阻尼效应,但模态叠加法不能考虑非线性.因此,如何合理考虑阻尼和非线性是核电结构土-结相互作用分析需要关注的问题.基于此,本文提出一种模态叠加和时步积分结合的土-结相互作用分区算法.其中,出于安全性考虑,地震作用下核电主体结构一般不允许进入非线性,因此结构可采用模态叠加方法,以便合理考虑结构阻尼;土体和基础采用显式时步积分法,可考虑土体非线性;通过人工边界条件考虑无限域的影响 (辐射阻尼).通过简单算例对该方法进行了验证,并用于CAP1400核电结构的土-结相互作用分析中,对比分析了采用模态阻尼和瑞利阻尼时核电结构和场地反应的差异,结果表明结构阻尼模型对场地的反应影响不大,但对结构反应影响明显,在实际工程中应合理选取阻尼模型.

     

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出版历程
  • 收稿日期:  2019-09-30
  • 刊出日期:  2020-02-10

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