陈大川,湛洋,王海东?覮,刘举.填充墙竖向不规则布置RC框架结构 考虑SSI效应的MPA分析[J].湖南大学学报:自然科学版,2020,(7):40~49
填充墙竖向不规则布置RC框架结构 考虑SSI效应的MPA分析
MPA Analysis of RC Frame with Vertical Irregular Masonry Infilled Walls Considering SSI Effect
  
DOI:
中文关键词:  动力分析  土-结构相互作用  填充墙  RC框架结构  模态静力推覆分析
英文关键词:dynamic analysis(MPA)  soil-structure interaction(SSA)  infill wall  RC frame structure  modal pushover aralysis
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作者单位
陈大川,湛洋,王海东?覮,刘举 (湖南大学 土木工程学院湖南 长沙 410082) 
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中文摘要:
      通过周期等效原则提出了考虑土-结构相互作用(SSI)的模态Pushover 分析方法(MPA),并验证了此方法的可行性. 以一10层填充墙竖向不规则布置的RC框架结构为研究对象,调整层刚度比和“薄弱层”布置位置,运用本文方法分析该类结构在不同场地和设防烈度条件下的地震响应规律. 结果表明:1)罕遇地震时,在“薄弱层最敏感楼层”设置“薄弱层”会使薄弱层效应更加显著,且随层刚度比增大该结构的层间位移角增大;“薄弱层敏感区域”外楼层的填充墙不规则布置不会使结构形成明显的薄弱层. 2)考虑SSI效应时,填充墙竖向不规则布置的RC框架结构的变形向底部楼层集中更加明显,随着场地土变软,结构倒塌时的层间刚度比降低,因此结构设计时需要更加严格控制层刚度比来确保该类结构在地震作用下的延性.
英文摘要:
      A modal pushover analysis (MPA) method based on the soil-structure interaction(SSI) was proposed through the principle of periodic equivalence, and the feasibility of this method was verified. Taking a 10-story RC frame structure with vertical irregular filling walls as the research object, we adjust the stiffness ratio between stories and the layout position of “weak stories”,and use this method to analyze the seismic response regular pattern of this kind of structure under the condition of different sites and seismic precautionary intensity. The results indicate that: 1)In strong earthquakes, setting up “weak layer” in “the most sensitive layer of weak layer” makes the effect of weak layer more significant, and the greater the ratio of stiffness between layers,the more adverse the displacement angle between layers of RC frame structure. Irregular arrangement of filled walls in the outer floor of "sensitive area of weak layer" makes the structure form the distinct weak layer. 2)With regard to SSI effect, the deformation of RC frame structure with filled wall concentrates more obviously to the bottom floor, and the stiffness ratio between layers decreases when the structure collapses and the site soil becomes soft. Therefore,it is proposed to control the stiffness ratio between stories more strictly to ensure the ductility of such structures under earthquake effect.
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